Provided is a sodium-ion battery, comprising a non-aqueous electrolyte, a positive electrode and a negative electrode, wherein the non-aqueous electrolyte comprises an additive, and the additive comprises a sodium-salt-type additive; the positive electrode comprises a positive electrode active material layer, the positive electrode active material layer comprises a sodium-replenishing additive and a positive electrode active material, and the sodium-replenishing additive is a sodium-rich transition metal oxide; and the negative electrode comprises a negative electrode active material. The sodium-ion battery satisfies the following relational expression: 0.3≤a/(b+c)≤1.5, wherein 5≤a≤10, 1≤b≤10, and 2≤c≤12; the total mass of the sodium-replenishing additive and the positive electrode active material is 100%; a is the mass content of the sodium-replenishing additive, the unit thereof being %; b is the mass content of the sodium-salt-type additive in the non-aqueous electrolyte, the unit thereof being %; and c is the particle size of the negative electrode active material, the unit thereof being μm. The internal resistance of the sodium-ion battery provided can be reduced, and the initial efficiency and cycle performance thereof can be improved.
In order to overcome the problems of battery expansion and capacity attenuation of the existing lithium ion battery during long-term high-temperature cycle, the application provides a lithium ion battery, which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the non-aqueous electrolyte comprise an additive A, an additive B and an additive C; the lithium ion battery satisfies the following condition:
In order to overcome the problems of battery expansion and capacity attenuation of the existing lithium ion battery during long-term high-temperature cycle, the application provides a lithium ion battery, which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the non-aqueous electrolyte comprise an additive A, an additive B and an additive C; the lithium ion battery satisfies the following condition:
0
.
0
1
5
≤
(
a
+
b
+
c
)
×
V
≤
0.09
;
when the lithium ion battery meets the condition of 0.015≤(a+b+c)×V≤0.09, the problem of gas production of electrolyte during long-term high-temperature cycle can be effectively solved, and the expansion rate of battery can be effectively reduced. Meanwhile, with catalysis under higher voltage, the additive could undergo special oxidation reaction on the positive electrode surface, forming a more stable and good protective film, which makes the positive electrode better protected, thus effectively improving the long-term high-temperature cycle capacity retention rate of the battery.
H01M 10/0567 - Liquid materials characterised by the additives
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/583 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
DGDD is the peak intensity of a D peak in the Raman spectrum from 1300 cm-1to 1400 cm-1GG is the peak intensity of a G peak in the Raman spectrum from 1530 cm-1to 1630 cm-1. The non-aqueous electrolyte comprises a non-aqueous solvent, a lithium salt and an additive, wherein the additive comprises a compound represented by structural formula (1). The lithium-ion battery satisfies the following conditions: 0.25≤f/(x*c)≤5, wherein 1≤c≤6, 0.5≤f≤5, and 0.5＜x≤0.8. The lithium-ion battery has relatively low impedance and excellent high-temperature stability.
A secondary battery and a preparation method therefor and an electric device. The secondary battery comprises a positive electrode, a negative electrode, a separator and an electrolyte. The positive electrode comprises a positive electrode active material, the positive electrode active material comprises an active material core and a carbon material coating layer, the electrolyte comprises an electrolyte salt, an organic solvent and an additive, the additive comprises a silane type additive, and the amount of the silane type additive is determined according to the specific surface area of the positive electrode active material and the content of a carbon material in the positive electrode active material. According to the secondary battery, the reasonable amount of a required additive is determined by means of the physical and chemical properties of an electrode material, and the silane type additive in the electrolyte can preferentially react on the surface of the positive electrode to form a CEI film, so that an active site on the electrode surface is passivated, the dissolution of metal ions is inhibited, side reactions between the electrolyte and the electrode material are reduced, and the electrochemical performance of the battery is improved.
The application relates to the technical field of electrochemistry, in particular to a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises a positive electrode active material and a conductive agent, the positive electrode active material is a manganese-containing positive electrode material; the electrolyte comprises a compound represented by the following structural formula 1:
The application relates to the technical field of electrochemistry, in particular to a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises a positive electrode active material and a conductive agent, the positive electrode active material is a manganese-containing positive electrode material; the electrolyte comprises a compound represented by the following structural formula 1:
The application relates to the technical field of electrochemistry, in particular to a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises a positive electrode active material and a conductive agent, the positive electrode active material is a manganese-containing positive electrode material; the electrolyte comprises a compound represented by the following structural formula 1:
The positive electrode active material, the conductive agent and the compound represented by structural formula 1 meet the following condition:
The application relates to the technical field of electrochemistry, in particular to a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises a positive electrode active material and a conductive agent, the positive electrode active material is a manganese-containing positive electrode material; the electrolyte comprises a compound represented by the following structural formula 1:
The positive electrode active material, the conductive agent and the compound represented by structural formula 1 meet the following condition:
0
.
5
≤
D
r
×
T
r
w
≤
1
6
The application relates to the technical field of electrochemistry, in particular to a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises a positive electrode active material and a conductive agent, the positive electrode active material is a manganese-containing positive electrode material; the electrolyte comprises a compound represented by the following structural formula 1:
The positive electrode active material, the conductive agent and the compound represented by structural formula 1 meet the following condition:
0
.
5
≤
D
r
×
T
r
w
≤
1
6
wherein, Dr and Tr are the ratios of the average particle size and specific surface area of the positive electrode active material to the conductive agent, respectively; w is the mass percentage of the compound represented by structural formula 1 in the electrolyte, and the unit is %.
H01M 10/0567 - Liquid materials characterised by the additives
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
In order to overcome the problems of high-temperature gas production and short cycle life in the existing high-voltage lithium ion batteries, the present invention provides a lithium ion battery, comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte. The non-aqueous electrolyte comprises a non-aqueous organic solvent, an additive, and a lithium salt; the additive comprises fluorinated cyclic carbonate, a phosphate compound containing unsaturated hydrocarbyl, a boron-containing lithium salt type additive, and a second additive; the second additive comprises at least one of a trinitrile compound and cyclic carboxylic acid anhydride; the high-voltage lithium ion battery satisfies the following conditions: 1≤[(p+q)×E]/b≤26, wherein 0.05≤b<1, 0.2≤p≤1.5, 0.01≤q≤1.5, and 2.6≤E≤3.3; and the charging cut-off voltage of the high-voltage lithium ion battery is greater than or equal to 4.6 V. According to the lithium ion battery provided by the present invention, the additives and the liquid retention coefficient are controlled, thereby greatly prolonging the cycle life of the high-voltage lithium ion battery, and effectively inhibiting high-temperature gas production of the high-voltage lithium ion battery.
The present invention relates to the technical field of lithium batteries, and in particular, to a lithium battery separator and a lithium battery. The separator comprises a block polymer, the porosity of the separator is p, the mass percentage of the block polymer relative to the separator is w, and the relationship between the porosity p of the separator and the relative mass percentage w of the block polymer satisfies that (1−w)/3
A sodium-ion battery electrolyte, which comprises a sodium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises fluoroethylene carbonate, 1,3-propane sultone and 1,3-propylene sultone, the sodium salt comprising a main sodium salt and sodium difluorophosphate. The sodium-ion battery electrolyte satisfies the following conditions: 0.3≤(a+b+c)*100/d≤7, and 1≤a≤5, 0.5≤b≤2, 1≤c≤3 and 100≤d≤1000, wherein a is the mass percentage content of fluoroethylene carbonate in the sodium-ion battery electrolyte, with the unit being %; b is the mass percentage content of 1,3-propane sultone in the sodium-ion battery electrolyte, with the unit being %; c is the mass percentage content of 1,3-propylene sulfonate in the sodium-ion battery electrolyte, with the unit being %; and d is the mass content of sodium difluorophosphate in the sodium-ion battery electrolyte, with the unit being ppm. A sodium-ion battery, which comprises the sodium-ion battery electrolyte. The sodium-ion battery electrolyte can effectively improve the high-temperature storage and high-temperature cycle performance of the sodium-ion battery, and can also effectively reduce the impedance of the battery, thereby avoiding the influence of a formed passive film on the low-temperature performance and rate capability of the battery.
Provided is a non-aqueous electrolyte, comprising a solvent, an electrolyte salt and a compound represented by structural formula 1:
Provided is a non-aqueous electrolyte, comprising a solvent, an electrolyte salt and a compound represented by structural formula 1:
Provided is a non-aqueous electrolyte, comprising a solvent, an electrolyte salt and a compound represented by structural formula 1:
wherein, A, G and X are each independently selected from a cyclic sulfate group and its derivatives, a cyclic sulfonate group and its derivatives, a cyclic sulfite group and its derivatives or a group D; one or none of A, G and X is selected from the group D, and the group D is selected from a C1-C4 alkyl group, a C1-C4 unsaturated hydrocarbon group, a C1-C4 haloalkyl group, a C1-C4 nitrile group, a C1-C4 ether group or a C1-C4 ketone group. The application also provides a battery comprising the non-aqueous electrolyte. By adopting the above compound as an additive for the non-aqueous electrolyte, the film-forming quality of the surfaces of positive and negative electrodes can be effectively improved, and thus the battery performance is improved.
A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed on the positive electrode current collector. The positive electrode material layer includes a high-nickel positive electrode material represented by formula I and a compound represented by formula II: LiaNiqCoyMzO2, Formula I, where 0.9≤a≤1.2, 0.7≤q≤1, y≥0, z≥0, and q+y+z=1. M is selected from one or both of Mn and Al. R1, R2, and R3 are each independently selected from an alkyl group of 1 to 5 carbon atoms, a fluoroalkyl group of 1 to 5 carbon atoms, an ether group of 1 to 5 carbon atoms, a fluoroether group of 1 to 5 carbon atoms, an unsaturated hydrocarbonyl group of 2 to 5 carbon atoms.
A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed on the positive electrode current collector. The positive electrode material layer includes a high-nickel positive electrode material represented by formula I and a compound represented by formula II: LiaNiqCoyMzO2, Formula I, where 0.9≤a≤1.2, 0.7≤q≤1, y≥0, z≥0, and q+y+z=1. M is selected from one or both of Mn and Al. R1, R2, and R3 are each independently selected from an alkyl group of 1 to 5 carbon atoms, a fluoroalkyl group of 1 to 5 carbon atoms, an ether group of 1 to 5 carbon atoms, a fluoroether group of 1 to 5 carbon atoms, an unsaturated hydrocarbonyl group of 2 to 5 carbon atoms.
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
A lithium-ion battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode material layer, the positive electrode material layer includes a positive electrode active material, and the positive electrode active material includes LiNixCoyMnzL(1-x-y-2)O2, where L is Al, Sr, Mg. Ti, Ca, Zr, Zn, Si, Cu, V or Fe, 0.5≤x≤1, 0≤y≤0.5, 0≤z≤0.5, 0≤x+y+z≤1, and an upper limit voltage of the lithium-ion battery is ≥4.2 V. The non-aqueous electrolyte includes a solvent, an electrolyte salt and a compound represented by formula 1: A-D-B-E-C, Formula 1. Based on a total mass of the non-aqueous electrolyte as 100%, the compound represented by the formula 1 is added in an amount of 0.01 to 5.0%.
H01M 10/0567 - Liquid materials characterised by the additives
C07D 411/14 - Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen and sulfur atoms as the only ring hetero atoms containing three or more hetero rings
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed thereon. The positive electrode sheet has a potential range of greater than or equal to 4.25 V with respect to metal lithium. The positive electrode material layer includes a positive electrode active material doped or coated with metal elements and a compound represented by formula I. The positive electrode sheet satisfies:
A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed thereon. The positive electrode sheet has a potential range of greater than or equal to 4.25 V with respect to metal lithium. The positive electrode material layer includes a positive electrode active material doped or coated with metal elements and a compound represented by formula I. The positive electrode sheet satisfies:
0.3
≤
(
m
+
n
)
100
k
≤
59
;
A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed thereon. The positive electrode sheet has a potential range of greater than or equal to 4.25 V with respect to metal lithium. The positive electrode material layer includes a positive electrode active material doped or coated with metal elements and a compound represented by formula I. The positive electrode sheet satisfies:
0.3
≤
(
m
+
n
)
100
k
≤
59
;
and 50≤m≤10000, 50≤n≤10000, 2.8≤k≤3.8; where m is a content of the compound in the positive electrode material layer; n is a total content of the metal elements doped and coated in the positive electrode material layer; and k is a compacted density of the positive electrode material layer. A characteristic peak appears in a region having a retention time of 6.5 min to 7.5 min.
A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed thereon. The positive electrode sheet has a potential range of greater than or equal to 4.25 V with respect to metal lithium. The positive electrode material layer includes a positive electrode active material doped or coated with metal elements and a compound represented by formula I. The positive electrode sheet satisfies:
0.3
≤
(
m
+
n
)
100
k
≤
59
;
and 50≤m≤10000, 50≤n≤10000, 2.8≤k≤3.8; where m is a content of the compound in the positive electrode material layer; n is a total content of the metal elements doped and coated in the positive electrode material layer; and k is a compacted density of the positive electrode material layer. A characteristic peak appears in a region having a retention time of 6.5 min to 7.5 min.
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
14.
ELECTROLYTE FOR SODIUM-ION BATTERY, AND SODIUM-ION BATTERY
An electrolyte for a sodium-ion battery, and a sodium-ion battery. The electrolyte contains a first electrolyte salt and a non-aqueous organic solvent, the first electrolyte salt containing sodium sulfamate and sodium bis(fluorosulfonyl) imide.
In order to overcome the technical problem of reduced battery safety and high-and-low temperature performance caused by poor thermal stability of lithium hexafluorophosphate, which serves as primary lithium salt in non-aqueous electrolytes of existing lithium ion batteries, a lithium ion battery is provided. The lithium ion battery comprises a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte. The negative electrode comprises a negative electrode current collector and a negative electrode active material layer arranged on the negative electrode current collector, the negative electrode current collector comprising a polymer material substrate layer and a metal layer formed on at least one surface of the polymer material substrate layer, the non-aqueous electrolyte comprising lithium salt, the lithium salt comprising lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide, and the lithium ion battery meeting the following conditions: [equation], wherein 0.3≤S≤0.7, 0.3≤F≤0.7, 1.3≤C≤1.7, and 0.2≤d≤10. The described lithium ion battery can form a uniform and complete electrolyte interfacial film on a negative electrode interface, and buffer and mitigate the problem of negative electrode expansion under large currents, thus reducing lithium plating, and improving the safety and high-and-low temperature performance of batteries.
In order to overcome the problem of large self-discharge of an existing lithium manganese iron phosphate battery, the present application provides a lithium-ion battery. The lithium-ion battery comprises a positive electrode sheet, a separator and a non-aqueous electrolyte, wherein the positive electrode sheet comprises a positive electrode material layer comprising a positive electrode active substance, the positive electrode active substance comprising lithium manganese iron phosphate or a mixed material containing lithium manganese iron phosphate; and the non-aqueous electrolyte comprises a boron-containing additive, the boron-containing additive comprising at least one of lithium difluoro oxalate borate, lithium oxalate borate and tris(trimethylsilane) borate. The lithium-ion battery satisfies the following condition: 0.2≤10×p×m/d≤50, where 0.01≤m≤2, 20≤p≤50, and 12≤d≤40, wherein m is the mass percentage content of the boron-containing additive in the non-aqueous electrolyte, the unit thereof being %; p is the porosity of the separator, the unit thereof being %; and d is the single-side surface density of the positive electrode sheet, the unit thereof being mg/cm2. The lithium-ion battery provided in the present application has a relatively high energy density and good high-temperature storage performance.
AAA≤5, 0.1≤d≤10, and 3.3≤c≤3.8. The lithium ion battery provided by the present invention can achieve effective improvements in high-temperature cycle and storage performances.
In order to overcome the problems of insufficient reactions, long reaction time and low product yields during lithium hexafluorophosphate preparation using existing tubular reactors, the present invention provides a preparation method for a lithium hexafluorophosphate solution, a lithium ion battery electrolyte, and a lithium ion battery. The preparation method comprises the following operating steps: pressurizing phosphorus pentafluoride gas by means of a pressurizing pump, a second continuous flow reactor being provided with a plurality of micro-channels, a feeding end of the second continuous flow reactor being provided with a necked portion and an expanded portion, the pressurized phosphorus pentafluoride gas being fed through the necked portion, a lithium fluoride supply pipe used for supplying a carbonate solution of lithium fluoride being externally connected to the necked portion, and the expanded portion being communicated with the necked portion and the plurality of micro-channels separately; and discharging a lithium hexafluorophosphate solution from a discharging end of the second continuous flow reactor. The preparation method provided by the present invention can effectively improve the reaction efficiency and increase the yield of a lithium hexafluorophosphate product.
5050 of a positive electrode active material in the positive electrode is 2-10 μm. Cyclic voltammetry testing shows that the difference of currents corresponding to the oxidation peak and the reduction peak of the positive electrode is 0.002-0.008 A/g.
A lithium-ion battery electrolyte and a lithium-ion battery containing an electrolyte. A preparation method of the lithium-ion battery electrolyte comprises the following steps: dissolving lithium fluoride in a linear carbonate solvent, introducing phosphorus pentafluoride gas to perform reaction, and obtaining a solution precursor containing lithium hexafluorophosphate; passing the solution precursor containing lithium hexafluorophosphate into a fixed bed fixed with a fluorocarbon material to bring the solution precursor containing lithium hexafluorophosphate into contact with the fluorocarbon material, and obtaining a purified lithium hexafluorophosphate carbonate solution after separation; and diluting the lithium hexafluorophosphate carbonate solution using a solvent, then adding an additive and mixing to obtain the lithium-ion battery electrolyte. The preparation method of the lithium-ion battery electrolyte provided by the present invention can effectively reduce the hydrogen fluoride content in the electrolyte and improve the performance of the lithium-ion battery.
A method for catalyzing a reaction of an epoxide compound and carbon dioxide with a catalyst. The catalyst comprises at least one compound of formula (1):
A method for catalyzing a reaction of an epoxide compound and carbon dioxide with a catalyst. The catalyst comprises at least one compound of formula (1):
where R is selected from an alkyl group, an alkenyl group, a halohydrocarbyl group, an aromatic hydrocarbyl group, an imidazolyl group, or a heteroaromatic hydrocarbyl group; X is selected from halogens; B is selected from nitrogen, or phosphorus; A is selected from any of the following formulae with a sign * representing a bonding position:
A method for catalyzing a reaction of an epoxide compound and carbon dioxide with a catalyst. The catalyst comprises at least one compound of formula (1):
where R is selected from an alkyl group, an alkenyl group, a halohydrocarbyl group, an aromatic hydrocarbyl group, an imidazolyl group, or a heteroaromatic hydrocarbyl group; X is selected from halogens; B is selected from nitrogen, or phosphorus; A is selected from any of the following formulae with a sign * representing a bonding position:
In order to solve the problem of hydrogen chloride residues in the existing preparation process of lithium hexafluorophosphate, the present invention provides a preparation method for liquid lithium hexafluorophosphate. The preparation method comprises the following operation steps: obtaining primary phosphorus pentafluoride; bringing the primary phosphorus pentafluoride to be in sufficient contact with an adsorption material, such that hydrogen chloride in the primary phosphorus pentafluoride is adsorbed on a chlorine modified carbon material to obtain a purified phosphorus pentafluoride gas, wherein the adsorption material comprises at least one of the chlorine modified carbon material, chlorinated aromatic hydrocarbon, a chlorinated aromatic hydrocarbon polymer, and aryl ether; and synthesis reaction: dissolving lithium fluoride in a solvent, and introducing the purified phosphorus pentafluoride gas to prepare liquid lithium hexafluorophosphate. In addition, further disclosed in the present invention are an electrolyte prepared by using the preparation method, and a lithium-ion battery. The preparation method provided by the present invention can effectively reduce hydrogen chloride residues in the electrolyte and improve the performance of the lithium-ion battery.
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
A sodium-ion secondary battery, comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode comprises a conductive agent, a binder, and a negative electrode active material. The non-aqueous electrolyte solution comprises a sodium salt, an additive, and a non-aqueous organic solvent. The additive comprises sodium bis(fluorosulfonyl)imide. The non-aqueous organic solvent comprises propylene carbonate. The sodium-ion secondary battery satisfies relational expression (I), wherein 1%≤a%≤10%, 2%≤b%≤10%, 2 μm≤c≤12 μm, 1%≤x%≤5%, and 5%≤y%≤40%; on the basis of the mass of the negative electrode active material layer being 100%, the mass content of the conductive agent is a%, and the mass content of the binder is b%; c is the particle size of the negative electrode active material; and on the basis of the total mass of the non-aqueous electrolyte solution being 100%, the mass content of sodium bis(fluorosulfonyl)imide is x%, and the mass content of propylene carbonate is y%. The sodium-ion secondary battery has remarkably improved cycle performance and high rate performance.
Provided is a sodium ion battery, comprising a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte solution. The non-aqueous electrolyte solution comprises an electrolyte salt and a solvent; the non-aqueous electrolyte solution further comprises a first additive and a second additive, the first additive is selected from at least one of TMSP and TMSB, and the second additive is selected from at least one of RPS and DTD; the mass percentage a% of the first additive in the non-aqueous electrolyte solution is 0.2%-3%; the mass percentage b% of the second additive in the non-aqueous electrolyte solution is 1%-5%; the positive electrode comprises a positive electrode active material, and the pH value c of the positive electrode active material is 5-13; and a, b, and c satisfy the following relational expression: 1.5≤10(a+b)/c≤10. By optimizing the composition of the sodium ion battery, the irreversible capacity loss can be effectively reduced, the internal resistance growth rate and the gas production rate in the high-temperature cycle process of the battery are reduced, and the initial charge-discharge efficiency and the cycle performance are improved.
Provided is a lithium iron phosphate battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode material layer with a compacted density of 2.3-2.8 g/cc, and the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises LiFePO4; the non-aqueous electrolyte comprises a solvent, an electrolyte salt, vinylene carbonate and a compound represented by Structural formula 1; an addition amount of the compound represented by Structural formula 1 is 0.01-5% based on a total mass of the non-aqueous electrolyte being 100%. The lithium iron phosphate battery provided by the application adopts the combination of vinylene carbonate and the compound represented by Structural formula 1, which can inhibit the generation of lithium dendrites and dissolution of Fe, and ultimately improve the high-temperature and safety performance of the High-compacted-density lithium iron phosphate battery.
Provided is a lithium iron phosphate battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode material layer with a compacted density of 2.3-2.8 g/cc, and the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises LiFePO4; the non-aqueous electrolyte comprises a solvent, an electrolyte salt, vinylene carbonate and a compound represented by Structural formula 1; an addition amount of the compound represented by Structural formula 1 is 0.01-5% based on a total mass of the non-aqueous electrolyte being 100%. The lithium iron phosphate battery provided by the application adopts the combination of vinylene carbonate and the compound represented by Structural formula 1, which can inhibit the generation of lithium dendrites and dissolution of Fe, and ultimately improve the high-temperature and safety performance of the High-compacted-density lithium iron phosphate battery.
A-D-B-E-C Structural formula 1
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
The present disclosure provides a use of a catalyst for catalyzing a reaction of an epoxide compound and carbon dioxide, the catalyst includes a spirocyclic compound including at least one compound of formula (1):
The present disclosure provides a use of a catalyst for catalyzing a reaction of an epoxide compound and carbon dioxide, the catalyst includes a spirocyclic compound including at least one compound of formula (1):
The present disclosure provides a use of a catalyst for catalyzing a reaction of an epoxide compound and carbon dioxide, the catalyst includes a spirocyclic compound including at least one compound of formula (1):
where X is selected from nitrogen, or phosphorus; Y is selected from halogens; A and B are independently selected from materials having formulae (a) to (d). Compared with catalysts with a non-spirocyclic structure or Lewis acid metal catalysts, the catalyst including the spirocyclic compound having the structural shown in formula 1 has the advantages of better catalytic effect, more stable performance and longer service life when catalyzing the reaction of the epoxy compounds and carbon dioxide. The present catalyst has both high efficiency and safety, and thus has broad application prospects.
222 - and a lithium salt, and the lithium salt comprises lithium hexafluorophosphate. The lithium-ion battery meets the following conditions: 0.1≤m*(10*b+c)/a≤30, 0.5≤a≤1.5, 0.01≤m≤0.8, 0.01≤b≤2, and 0.5≤c≤30. The lithium-ion battery provided by the present invention has relatively good cycle stability, and the cycle life of the battery is effectively prolonged.
A high-initial-efficiency quick-charging sodium-ion battery and an application. The high-initial-efficiency quick-charging sodium-ion battery comprises an electrolytic solution, a negative electrode, and a positive electrode; the electrolytic solution comprises a solvent, an electrolyte salt, a first additive, and a second additive; the first additive is sodium trifluoromethanesulfonate, and the second additive is a chalcogenide compound; the content of the first additive in the electrolytic solution is a wt%, and the content of the second additive in the electrolytic solution is b wt%; the negative electrode comprises a negative electrode material, and the compacted density of the negative electrode material is c g/cm3, c having the following relation with a and b: 0.2≤(a+b)/4c≤2.5.
Provided in the present disclosure is the use of a catalyst in a reaction of catalyzing an epoxy compound and carbon dioxide. The catalyst comprises at least one of compounds as shown in structural formula 1, wherein R is selected from an alkyl, an alkenyl, a halogenated hydrocarbon group, an aryl, imidazolyl and a heterocyclic aryl; X is selected from a halogen element; B is selected from nitrogen and phosphorus; and A is selected from structure a and structure b.
A sodium-ion battery, comprising a positive electrode, a negative electrode and an electrolyte, wherein a slope area capacity ratio A and a platform area capacity ratio B which correspond to a discharge capacity curve of a button cell test performed on the negative electrode satisfy: 0.66 ≤ A/B ≤ 2.34; and the electrolyte comprises NaFSI, and the mass percentage C of the usage amount of NaFSI relative to the electrolyte satisfies: 1% ≤ C ≤ 15%. By means of adjusting the ratio of a platform area capacity to slope area capacity of an anode active material, it can be ensured that a negative electrode has enough capacity for exertion, and a positive-negative electrode capacity release ratio is stabilized, such that Na+deintercalated from a positive electrode can be completely intercalated into the negative electrode, and the plating of Na+ at the negative electrode is prevented, thereby effectively inhibiting the occurrence of a sodium plating phenomenon; moreover, NaFSI is used in an electrolyte and the content range thereof is controlled, such that while the conductivity of the electrolyte is improved, the film forming stability of positive and negative sides of a battery is good, and a current collector does not corrode, thereby effectively improving the rate capability and the cycling stability of the battery.
xn2n+1-xm2m+12m+1, wherein x/(2n+1) < 80%, n/m > 1.5, 4 ≤ n ≤ 10, and 1 ≤ m ≤ 5; and the mass percentage content C% of the fluoroether in the electrolyte solution is 7% ≤ C% ≤ 30%. The compaction density D of the negative electrode is 0.85-1.00 g/cm3.
xn2n+1-xm2m+12m+1 [structural formula 1], wherein x/(2n+1)<0.8, n/m>1.5, 4≤n≤10 and 1≤m≤5. The sodium ion secondary battery satisfies the following relational expression: 0.9≤(a·d)/(b·c)≤20, wherein 8wt%≤a≤25wt%, 0.5wt%≤b≤3wt% and 4m2/g≤c≤7m2/g. The sodium ion secondary battery provided in the invention has improved cycle performance and initial efficiency.
12122 contains a fluorine atom. The lithium-ion battery satisfies the following condition: 0.7 ≤ lga-lgb ≤ 2.6, wherein 1 ≤ a ≤ 150, and 5% ≤ b ≤ 40%. The lithium-ion battery is capable of properly alleviating the impact of the iron metal impurity, which is introduced into a graphite negative electrode during the production process, on the cycling performance of the battery under a high voltage.
In order to solve the problem of the dissolving-out of Mn ions due to the valence changes of Mn in existing lithium-ion battery positive electrodes, the present invention provides a lithium-ion battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte solution, wherein the positive electrode comprises a positive electrode material layer that contains a positive electrode active material; the positive electrode active material comprises a manganese-containing positive electrode material, and the specific surface area of the positive electrode active material is 0.5-1.5 m2/g; and the non-aqueous electrolyte solution comprises a non-aqueous organic solvent, an additive and a lithium salt, and the additive comprises a compound as represented by structural formula 1: (1). The lithium-ion battery satisfies the following condition: 0.5 ≤ (Vr/Vr*)/Wr ≤ 12, where 0.4 ≤ Vr/Vr* ≤ 1.5, and 0.1 ≤ Wr ≤ 3. The lithium-ion battery provided in the present invention can effectively inhibit the irreversible change of the manganese ion valence of a manganese-containing positive electrode material during the cycling process of a battery, such that the dissolving-out of manganese ions in the manganese-containing positive electrode material is reduced.
xn2n+1-xm2m+12m+1, wherein x/(2n+1) < 80%, n ≥ 5, and m+n ≤ 9. The fluoroether compound is selected from at least one of hexafluoropentyl methyl ether, hexafluoropentyl ethyl ether, heptafluoropentyl methyl ether, heptafluoropentyl ethyl ether, octafluoropentyl methyl ether, octafluoropentyl ethyl ether, nonafluorohexyl methyl ether, nonafluorohexyl ethyl ether, decafluoroheptyl methyl ether or decafluoroheptyl ethyl ether. The fluoroether compound of the present invention can be applied to an electrolyte solution of a sodium-ion battery, such that the film forming stability at positive electrode and negative electrode sides is effectively improved, side reactions are inhibited, the transport rate of sodium ions is increased, and the cycling stability and the rate discharge capacity of the sodium-ion battery are significantly improved.
To overcome a problem of insufficient stability of cathode/electrolyte interphases (CEIs) in existing lithium ion batteries, the present invention provides a lithium ion battery comprising a positive electrode sheet, a negative electrode sheet, and a non-aqueous electrolyte. The non-aqueous electrolyte comprises a non-aqueous organic solvent and a lithium salt, and the lithium salt comprises lithium difluorophosphate and a primary lithium salt different from lithium difluorophosphate. The positive electrode sheet comprises a positive electrode material layer and an interphase formed on a surface of the positive electrode material layer. The positive electrode sheet is detected by means of X-ray photoelectron spectroscopy. When a 1s peak of carbon is obtained at 284.5 eV, a characteristic peak of LiF is present in a range from 682 eV to 687 eV, and the lithium ion battery meets the following conditions: 0.25≤1000*m/(d*t)≤150, 10≤d≤30, 0.5≤t≤30, and 0.016≤m≤5.4. According to the lithium ion battery provided in the present invention, the damage to CEIs under the effect of a volume change and a high temperature of a positive electrode material during high-temperature circulation of batteries is effectively reduced.
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
wherein n is 0 or 1, A is selected from C or O, X is selected from
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
wherein n is 0 or 1, A is selected from C or O, X is selected from
R1 and R2 are each independently selected from H,
R1 and R2 are not selected from H at the same time, and X, R1 and R2 comprise at least one sulfur atom;
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
wherein n is 0 or 1, A is selected from C or O, X is selected from
R1 and R2 are each independently selected from H,
R1 and R2 are not selected from H at the same time, and X, R1 and R2 comprise at least one sulfur atom;
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
wherein n is 0 or 1, A is selected from C or O, X is selected from
R1 and R2 are each independently selected from H,
R1 and R2 are not selected from H at the same time, and X, R1 and R2 comprise at least one sulfur atom;
the secondary battery meets the following requirements:
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
wherein n is 0 or 1, A is selected from C or O, X is selected from
R1 and R2 are each independently selected from H,
R1 and R2 are not selected from H at the same time, and X, R1 and R2 comprise at least one sulfur atom;
the secondary battery meets the following requirements:
0
.
2
1
≤
m
*
n
*
r
S
≤
40
;
The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1;
wherein n is 0 or 1, A is selected from C or O, X is selected from
R1 and R2 are each independently selected from H,
R1 and R2 are not selected from H at the same time, and X, R1 and R2 comprise at least one sulfur atom;
the secondary battery meets the following requirements:
0
.
2
1
≤
m
*
n
*
r
S
≤
40
;
and 40%≤m≤90%, 0.05%≤n≤2%, 1.2 g/cm3≤r≤1.8 g/cm3, 5%≤S≤30%.
In order to overcome the problem of additives for lithium-ion battery now available having unstable film forming quality and thus affecting the cycling performance of the batteries, the present invention provides a lithium-ion battery. The lithium-ion battery comprises a positive electrode sheet, a negative electrode sheet and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution comprises a non-aqueous organic solvent, a lithium salt and an additive, and the additive comprises FEC; the negative electrode sheet comprises a negative electrode material layer and an interfacial film formed by the non-aqueous electrolyte solution on the surface of the negative electrode material layer; and during the detection of the negative electrode sheet by means of X-ray photoelectron spectroscopy, when a carbon 1s peak is obtained at 284.5 eV, a characteristic peak of LiF appears in a region of 682-687 eV. The lithium-ion battery satisfies the following conditions: 0.3 ≤ n/p + m ≤ 25, and 10 ≤ n ≤ 40, 5 ≤ p ≤ 150, and 0.01 ≤ m ≤ 20.
In order to solve the problem that the existing manganese-based positive electrode material battery has insufficient high-temperature cycle and high-temperature storage performances due to the dissolution of manganese ions, the present application provides a secondary battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by structural formula 1:
In order to solve the problem that the existing manganese-based positive electrode material battery has insufficient high-temperature cycle and high-temperature storage performances due to the dissolution of manganese ions, the present application provides a secondary battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by structural formula 1:
In order to solve the problem that the existing manganese-based positive electrode material battery has insufficient high-temperature cycle and high-temperature storage performances due to the dissolution of manganese ions, the present application provides a secondary battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by structural formula 1:
the secondary battery meets the following requirements:
In order to solve the problem that the existing manganese-based positive electrode material battery has insufficient high-temperature cycle and high-temperature storage performances due to the dissolution of manganese ions, the present application provides a secondary battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by structural formula 1:
the secondary battery meets the following requirements:
0.05≤100×W×u/(q×s)≤5;
In order to solve the problem that the existing manganese-based positive electrode material battery has insufficient high-temperature cycle and high-temperature storage performances due to the dissolution of manganese ions, the present application provides a secondary battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by structural formula 1:
the secondary battery meets the following requirements:
0.05≤100×W×u/(q×s)≤5;
and 2.0 g/Ah≤W≤4.5 g/Ah, 0.05%≤u≤3.5%, 5%≤q≤65%, 10 mg/cm2≤s≤30 mg/cm2.
In order to solve the problem that the existing manganese-based positive electrode material battery has insufficient high-temperature cycle and high-temperature storage performances due to the dissolution of manganese ions, the present application provides a secondary battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by structural formula 1:
the secondary battery meets the following requirements:
0.05≤100×W×u/(q×s)≤5;
and 2.0 g/Ah≤W≤4.5 g/Ah, 0.05%≤u≤3.5%, 5%≤q≤65%, 10 mg/cm2≤s≤30 mg/cm2.
The secondary battery has a high capacity retention rate in the cycle and high-temperature storage processes, and has good cycle and storage performances.
Provided is the use of a catalyst in the catalysis of a reaction of an epoxy compound and carbon dioxide. The catalyst comprises a spirocyclic compound, and the spirocyclic compound comprises at least one of compounds as shown in the structural formula 1, wherein X is selected from a nitrogen element and a phosphorus element; Y is selected from halogen elements; and A and B are independently selected from any one of structural formulae a-d. Compared with a traditional non-spiro structure catalyst or a Lewis acid metal catalyst, the catalyst containing the spirocyclic compound as represented in structural formula 1 has the advantages of better catalytic effect, more stable performance and a longer service life when being used for catalyzing the reaction of an epoxy compound and carbon dioxide, and has both high efficiency and safety and wide use prospects.
5050 of a negative electrode active material is c, the viscosity of the electrolyte at -20°C is d, and a relationship is satisfied: 5≤5(b-a+d)/c≤23. According to the present application, sodium tetrafluoro(oxalato)phosphate is used as the first additive, so that the viscosity of the electrolyte at the temperature of -20°C or lower is reduced, and a negative electrode material in the particle size range is cooperatively used, such that ions have a better transmission rate; because sodium tetrafluoro(oxalato)phosphate is insufficient in stability when participating in film formation, the cyclic sulfate additive is used in cooperation and can be better than other components of the electrolyte to participate in film formation, so that a low-impedance and stable SEI film is formed, and the objectives of improving the low-temperature discharge performance of a sodium ion battery and improving the cycle performance are achieved.
122 are each independently selected from a hydrogen atom, a halogen atom, a C1-C5 hydrocarbyl group or a C1-C5 halogenated hydrocarbyl group. The non-aqueous electrolyte can form a stable SEI film on the surface of a negative electrode, thereby reducing the decomposition of the solvent on the negative electrode, and improving the high-temperature storage performance and the high-temperature cycle performance of the battery.
The existing positive electrode material that is doped or coated with compound has the problem OF ion dissolution and battery performance deterioration at high temperature. To solve it, the invention provides a lithium-ion battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, and the positive electrode active material comprises LiMO2, where M is selected from one or more of Ni, Co and Mn, and the positive electrode active material is doped with a compound containing metal element A and/or coated with a compound containing metal element A, the non-aqueous electrolyte comprises a solvent, an electrolyte salt and a compound represented by Structural formula 1. The lithium-ion battery provided by the invention could effectively improve the overall stability of the material.
H01M 10/0567 - Liquid materials characterised by the additives
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 10/0568 - Liquid materials characterised by the solutes
H01M 10/0569 - Liquid materials characterised by the solvents
In order to overcome the problems of the decomposition of a passive film and the dissolution of metal ions of an existing lithium-ion battery under a high working voltage, a lithium-ion battery is provided. The lithium-ion battery comprises a positive electrode sheet, a negative electrode sheet, and a non-aqueous electrolytic solution, wherein the positive electrode sheet comprises a positive electrode current collector and a positive electrode material layer disposed on the positive electrode current collector, and the resistivity of the positive electrode sheet is less than or equal to 1500 Ω·cm; the non-aqueous electrolytic solution comprises a non-aqueous organic solvent, a lithium salt and an additive, and the additive comprises at least one cyclic sulfonate selected from 1,3-propane sultone, 1,4-butane sultone, prop-1-ene-1,3-sultone and methylene methanedisulfonate; and the lithium-ion battery meets the following conditions: 0.3 ≤ m*d/f ≤ 20, where 70 ≤ d ≤ 150, 3 ≤ f ≤ 30, and 0.01 ≤ m ≤ 3. A relatively stable interface film is formed during the formation of the provided lithium-ion battery, which is conducive to improving the structural stability of a positive electrode active material, inhibiting the dissolution of metal ions, and avoiding the consumption and decomposition of a non-aqueous electrolytic solution during a cycling process.
In order to overcome the problems in existing lithium ion batteries having high compactness and high-specific-surface-area negative electrodes of serious side reactions of electrolytes and high gas production, the present invention provides a lithium ion battery, comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode comprises a negative electrode material layer, the compaction density of the negative electrode material layer is greater than or equal to 1.4 g/cm3, and the negative electrode material layer comprises a negative electrode active material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt, a vinylene carbonate, a fluoroethylene carbonate, and an unsaturated phosphate represented by structural formula 1, and the electrolyte salt comprises LiPF6 and LiFSI. The lithium ion battery provided by the present invention has good cycle performance, high and low temperature storage performance, and lithium precipitation resistance.
H01M 10/0568 - Liquid materials characterised by the solutes
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/133 - Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/587 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
47.
ELECTROLYTE SOLUTION WITH STABLE PERFORMANCE AND SECONDARY BATTERY
Provided in the present invention is an electrolyte solution, comprising an electrolyte salt and a solvent, wherein the electrolyte salt comprises lithium hexafluorophosphate. The electrolyte solution further comprises at least one of the compounds represented by structural formula (I), wherein R1, R2, R3 and R4 are each independently selected from hydrogen and an alkyl; and R5 is selected from halogen elements. The present invention further provides a secondary battery comprising the electrolyte solution. The inventors have found in research that a trace amount of the compound represented by structural formula I can serve as a stabilizer in the electrolyte solution, can effectively maintain the stability of effective components of the electrolyte solution during the formulation, storage and transportation process, and avoid decomposition, fission or chemical reaction of the effective components; and can maintain the stability of the chromaticity of the electrolyte solution in a high-temperature storage state, such that a stable exertion of various properties of a battery is ensured.
A lithium ion battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte solution. The positive electrode comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, and the positive electrode active material comprises lithium cobaltate doped or coated with aluminum. The non-aqueous electrolyte solution comprises a non-aqueous organic solvent, a lithium salt and an additive, the additive comprising a first additive and a second additive, wherein the first additive comprises a cyclic sulfonate, and the second additive comprises a compound represented by structural formula (1). The lithium ion battery satisfies the following conditions: 0.1≤a/c≤5; 0.3≤b/c≤20, and 0.2≤a≤1, 0.1≤b≤5, and 0.1≤c≤5. The lithium ion battery has good high-temperature storage performance and high-temperature cycling performance, which is beneficial for prolonging the service life of the battery.
A sodium-ion secondary battery, comprising a positive electrode, a negative electrode and an electrolyte. The negative electrode comprises a negative electrode active material; the electrolyte comprises a sodium salt, a non-aqueous organic solvent and an additive, the sodium salt comprising sodium bis(fluorosulfonyl)imide, and the additive comprising a corrosion inhibitor and a sulfate ester compound. The sodium-ion secondary battery satisfies the following relational expressions: 0.4≤(a·d)/(b·c)≤23, 3≤a≤15, 0.5≤b≤3, 3≤c≤7, 0.5≤d≤15; the mass percentage of sodium bis(fluorosulfonyl)imide in the electrolyte is a%; the mass percentage of the sulfate ester compound in the electrolyte is b%; the specific surface area of the negative electrode active material is c, the unit being m2/g; and the mass percentage of the inhibitor in the electrolyte is d%. The present sodium-ion secondary battery can form a stable CEI film on the surface of the positive electrode, and form a stable SEI film on the surface of the negative electrode. The current collector does not experience corrosion, and side reactions of the battery are inhibited; effectively reducing battery impedance, and improving initial efficiency and cycling performance of the battery.
A lithium-ion battery, comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode comprises a positive electrode material layer; the positive electrode material layer comprises a positive electrode active material containing lithium cobalt oxide; the negative electrode comprises a negative electrode current collector and a negative electrode material layer formed on the negative electrode current collector; the negative electrode material layer comprises a negative electrode active material; the non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt, and an additive; and the non-aqueous organic solvent comprises a carboxylic ester. The lithium-ion battery has good performance under both high and low temperature conditions.
Provided are a non-aqueous electrolyte comprising a solvent, an electrolyte salt and a first additive, wherein the first additive is selected from at least one of the compounds as shown in structural formula 1: A-D-B-E-C, structural formula 1, wherein A, B, and C are each independently selected from the group consisting of cyclic carbonate groups, cyclic sulfate groups, cyclic sulfite groups, cyclic sulfonate groups, cyclic sulfone groups, cyclic sulfoxide groups, cyclic carboxylate groups or cyclic anhydride groups; D and E are each independently selected from single bond, or groups containing hydrocarbylene groups, ether bonds, sulfur-oxygen double bonds or carbon-oxygen double bonds; and the content of methanol in the non-aqueous electrolyte is 200 ppm or less. Further disclosed is a battery comprising the non-aqueous electrolyte.
maxminmaxminminmin*100%≤30%. According to the lithium-ion battery, safety performance is improved while high cycle life and performance consistency are ensured.
00 of the positive electrode is greater than 220ºC; and the non-aqueous electrolyte solution comprises a non-aqueous organic solvent, a lithium salt and an additive. The lithium-ion battery has relatively good hot box safety performance and cycle performance.
A lithium ion battery, comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode comprises a positive electrode current collector and a positive electrode material layer disposed on the positive electrode current collector, the positive electrode material layer comprises a positive electrode active material containing lithium cobalt oxide, and the resistivity of the positive electrode is less than or equal to 1000 Ω·cm; the non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt, and an additive, and the additive comprises a compound represented by structural formula 1: structural formula 1; and the lithium ion battery satisfies the following conditions: 0.05≤m*d/f≤5, 10≤d≤40, 3≤f≤30, and 0.01≤m≤3. The lithium ion battery effectively ensures the ionic conductivity and the electronic conductivity of the positive electrode, and has good dynamics performance and cycle performance without sacrificing energy density.
512344 are each independently selected from H, a halogen atom, or a substituted or unsubstituted C1-C5 hydrocarbon group. A secondary battery prepared by using the non-aqueous electrolyte solution is particularly suitable for work under high-temperature conditions, and the environmental adaptability of the secondary battery is improved.
The present invention relates to the technical field of catalysis, in particular to a catalyst for synthesizing a cyclic carbonate and a synthetic method for a cyclic carbonate. The present invention provides a novel catalyst having a hydroxyl quaternary phosphonium salt structure. The catalytic effect of the catalyst is significantly improved by selecting a specific type of substituent groups, and the catalyst also has better stability. According to the cyclic carbonate synthesized by using the catalyst of the present invention, the product selectivity can be as high as 99.8%, and the yield can be as high as 99%; and the catalyst can be repeatedly used three or more times and still maintains a relatively high yield of the cyclic carbonate, and the catalyst has good stability.
In order to solve problems that an existing aluminum electrolytic capacitor is prone to corrosion failure under a high voltage and has short service life, the present application provides an electrolyte for a high-voltage aluminum electrolytic capacitor and a high-voltage aluminum electrolytic capacitor. The electrolyte comprises a main solute B, an anti-corrosion material A and a solvent, and the electrolyte meets the following relational expressions: 0.1≤103×(σ×m×p)/(r×η)≤1.5，1％≤m≤5％, and 80mPa·s≤η≤400mPa·s. The prepared electrolyte has relatively high conductivity and breakdown voltage, so that failure phenomena of breakdown, valve opening, liquid leakage, corrosion, etc. of a capacitor can be avoided. The prepared aluminum electrolytic capacitor can resist high voltages of 500 V or above, has high conductivity, high voltage resistance and good corrosion resistance properties, and the service life reaches an effect of 5000 H at 105 ℃.
The present invention relates to the technical field of green, clean and efficient catalysis, and in particular, to a method for synthesizing a cyclic carbonate from carbon dioxide and an epoxy compound by means of a catalytic reaction and a corresponding catalyst. According to the present invention, a hydroxyazetidine quaternary ammonium salt is used as a catalyst for catalyzing the reaction of carbon dioxide and the epoxy compound to synthesize the cyclic carbonate. The novel hydroxyazetidine quaternary ammonium salt as the catalyst disclosed herein can help synthesize the cyclic carbonate with high efficiency and high selectivity under mild reaction conditions, and possesses cost-efficiency, high selectivity, good thermal stability and reusability.
C07D 233/60 - Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms with hydrocarbon radicals, substituted by oxygen or sulfur atoms, attached to ring nitrogen atoms
C07D 231/12 - Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
C07D 295/088 - Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms with the ring nitrogen atoms and the oxygen or sulfur atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings to an acyclic saturated chain
B01J 31/02 - Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
Provided is a method for improving ultra-violet light transmittance of ethylene glycol. The method comprises the following steps: (1) subjecting ethylene glycol, a catalyst, and water to a hydrolysis reaction at a temperature of 120 °C to 150 °C; and (2) adding a stabilizer into a product of the hydrolysis reaction, distilling under reduced pressure, and condensing to isolate a fraction. The described method can effectively decompose complex organic compound impurities in the ethylene glycol that contain carboxyl, conjugated double bonds, and aldehyde ketones and affect the ultra-violet light transmittance, thereby significantly improving UV values of ethylene glycol at 220 nm, 275 mm, and 350 nm, and the method takes into account requirements on environmental protection and safety and economic benefits and thereby has a wide application prospect.
DFDFF satisfy the condition of expression (I). The lithium secondary battery satisfies the following conditional expression (II), wherein the compaction density of the negative electrode material layer is marked as C, which satisfies 1.4 g/cm3≤C≤1.7 g/cm3. The lithium secondary battery can not only improve the ion conduction performance of the SEI film and the migration rate of lithium ions, and reduce battery impedance under low-temperature conditions, but can also improve the stability of the SEI film, such that the high-temperature cycling performance of the battery is improved, and the effect of lithium not being precipitated from the negative electrode of the lithium secondary battery is achieved.
1231233 is the unsaturated hydrocarbyl having 2-5 carbon atoms. The negative electrode sheet satisfies the following condition: 0.2≤10*c*a/b≤40, wherein 0.005≤a≤1, 10≤b≤50, and 92≤c≤98. Moreover, further disclosed in the present invention is a secondary battery comprising the negative electrode sheet. The negative electrode sheet provided in the present invention has a relatively low impedance, and can improve the permeability of a non-aqueous electrolyte to the negative electrode material layer, thereby effectively improving the cycle performance of the battery.
The present application belongs to the technical field of new energy, in particular to a non-aqueous electrolyte for a lithium ion battery and a lithium ion battery. The non-aqueous electrolyte for a lithium ion battery comprises a non-aqueous organic solvent, a lithium salt, and a spiro compound represented by Structural Formula 1. The compound represented by Structural Formula 1 has the characteristic of sulfonate additives to improve high-temperature storage performance of battery, and also has the characteristic of sulfate additives to improve high-temperature cycle performance of battery. A passivation film is deposited on the surface of positive electrode, and functional group X is further crosslinked to make the coated passivation film more compact and stable, which can effectively improve the electrochemical performance of the electrode, the storage performance and self-discharge performance of the battery.
The present application belongs to the technical field of new energy, in particular to a non-aqueous electrolyte for a lithium ion battery and a lithium ion battery. The non-aqueous electrolyte for a lithium ion battery comprises a non-aqueous organic solvent, a lithium salt, and a spiro compound represented by Structural Formula 1. The compound represented by Structural Formula 1 has the characteristic of sulfonate additives to improve high-temperature storage performance of battery, and also has the characteristic of sulfate additives to improve high-temperature cycle performance of battery. A passivation film is deposited on the surface of positive electrode, and functional group X is further crosslinked to make the coated passivation film more compact and stable, which can effectively improve the electrochemical performance of the electrode, the storage performance and self-discharge performance of the battery.
A sodium ion battery. The sodium ion battery comprises a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode comprises a negative electrode active material. The mass fraction (a) of the negative electrode active material in the negative electrode, the specific surface area (b) of the negative electrode active material, the density (x) of the non-aqueous electrolyte, and the molar conductivity (y) of the non-aqueous electrolyte satisfy the inequality: 0.3 ≤ a × b × x/y ≤ 1.5. An appropriate sodium ion battery is designed by comprehensively considering multiple aspects, including the mass fraction (a) of the negative electrode active material in the negative electrode, the specific surface area (b) of the negative electrode active material, and the density (x) and the molar conductivity (y) of the non-aqueous electrolyte. The above configuration can increase the battery capacity while effectively reducing the internal resistance of the sodium ion battery, such that the sodium ion battery has the advantages of low internal resistance and the good cycle stability.
In order to overcome the problem that manganese dissolution of existing lithium ion batteries having manganese-containing positive electrodes affects the performance of the batteries, the present invention provides a lithium ion battery, comprising a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator. The separator is located between the positive electrode and the negative electrode; the positive electrode comprises a positive electrode material layer, and the positive electrode material layer comprises a lithium-manganese-based positive electrode active material; the non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt, and an additive, and the additive comprises a compound shown in structural formula (1); the lithium ion battery satisfies the following conditions: 0.1≤q*m/p≤20, 20≤q≤60, 0.01≤m≤2, and 1.5≤p≤5. According to the lithium ion battery provided by the present invention, the ion exchange effect between Mn2+ and lithium in the negative electrode can be significantly reduced, damage of manganese to the negative electrode is inhibited, and the stability of the negative electrode is improved, thereby improving the safety performance of the lithium ion battery while ensuring the high energy density and cycle performance of the lithium ion battery.
H01M 10/0567 - Liquid materials characterised by the additives
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
The present invention provides a method for improving ultra-violet light transmittance of ethylene glycol, which includes the following steps: (1) subjecting ethylene glycol, a catalyst and water to a hydrolysis reaction at 120° C.-150° C.; and (2) adding a stabilizer into a product of the hydrolysis reaction, then conducting distillation at reduced pressure, and condensing to recover a fraction. The method of the present invention can effectively decompose impurities of carboxyl-, conjugated double bond-, aldehyde and ketone-containing complex organic compounds in the ethylene glycol which affect the ultra-violet light transmittance, obviously improve UV values of the ethylene glycol at 220 nm, 275 nm and 350 nm, give consideration to the requirements of environmental protection and safety and economic benefits, and have a broad application prospect.
The application relates to the technical field of lithium ion batteries and discloses a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a separator arranged between the positive electrode and negative electrode, and a non-aqueous electrolyte; an active material of the positive electrode comprises LiFePO4, the non-aqueous electrolyte comprises an organic solvent, a lithium salt, vinylene carbonate and a compound represented by Formula (1), wherein R1 is one or more of chain, cyclic and aromatic group with 2-20 carbon atoms, and a compacted density of the positive electrode material is more than 2 g/cm3. The lithium ion battery provided by the application may obviously improve the cycle and storage performances at high temperature, greatly improve the capacity retention rate and capacity recovery rate of battery, obviously reduce the thickness expansion rate after high-temperature storage, and meanwhile, greatly reduce the precipitation of iron ions.
The application relates to the technical field of lithium ion batteries and discloses a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a separator arranged between the positive electrode and negative electrode, and a non-aqueous electrolyte; an active material of the positive electrode comprises LiFePO4, the non-aqueous electrolyte comprises an organic solvent, a lithium salt, vinylene carbonate and a compound represented by Formula (1), wherein R1 is one or more of chain, cyclic and aromatic group with 2-20 carbon atoms, and a compacted density of the positive electrode material is more than 2 g/cm3. The lithium ion battery provided by the application may obviously improve the cycle and storage performances at high temperature, greatly improve the capacity retention rate and capacity recovery rate of battery, obviously reduce the thickness expansion rate after high-temperature storage, and meanwhile, greatly reduce the precipitation of iron ions.
H01M 10/0567 - Liquid materials characterised by the additives
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 10/0569 - Liquid materials characterised by the solvents
H01M 10/0568 - Liquid materials characterised by the solutes
H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
C07C 265/14 - Derivatives of isocyanic acid containing at least two isocyanate groups bound to the same carbon skeleton
x1-x44, formula (1). The positive electrode plate meets the following conditions: formula (2); and 0.1 ≤ n ≤ 8.1, 0.005 ≤ k ≤ 0.5, and 0.5 ≤ R ≤ 13. Moreover, further disclosed in the present invention is a lithium-ion battery comprising the positive electrode plate. The positive electrode plate provided in the present invention can take full advantage of the compatibility between the compound as shown in structural formula I and the positive electrode active material, such that the positive electrode active material has relatively high structural stability during charging and discharging processes, thereby effectively improving the high-temperature cycling performance.
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
69.
BATTERY ELECTROLYTIC SOLUTION, SECONDARY BATTERY, AND TERMINAL
This application provides a battery electrolytic solution, including an electrolyte salt and a non-aqueous organic solvent. The non-aqueous organic solvent includes a first organic solvent shown in a formula (I) and/or a second organic solvent shown in a formula (II): R1—S(═O)x—N(—R3)—R2 formula (I); and R1—S(═O)x—N(—R3)—S(═O)y—R4 formula (II). R1 and R4 are separately selected from fluoroalkyl, fluoroalkoxy, fluoroalkenyl, fluoroalkenyloxy, fluoroaryl, or fluoroaryloxy. R2 and R3 are separately selected from alkyl, alkoxy, alkenyl, alkenyloxy, aryl, or aryloxy. x is 1 or 2, and y is 1 or 2. A total content in mass of the first organic solvent and/or the second organic solvent in the electrolytic solution ranges from 10% to 90%. The electrolytic solution includes the first organic solvent and/or the second organic solvent of a high content in mass.
Disclosed are a non-aqueous electrolyte and a secondary battery, wherein the non-aqueous electrolyte comprises a non-aqueous organic solvent, an electrolyte salt and an additive; the non-aqueous organic solvent comprises a cyclic carbonate, and the mass percentage content of the cyclic carbonate in the non-aqueous organic solvent is 10-40%; the additive comprises a first additive as represented by formula I and a second additive as represented by formula II, and the reduction potential of the first additive is 0.95 V or more; and the non-aqueous electrolyte satisfies the following conditions: 0.05% ≤ A ≤ 1.8%; 0.01% ≤ B ≤ 0.2%; and 0.15 ≤ A/(B*10) ≤ 10.5.
The present application provides a positive electrode plate, the positive electrode plate comprising a positive electrode current collector and a positive electrode material layer, which is formed on the positive electrode current collector. The potential range of the positive electrode plate relative to metal lithium is greater than or equal to 4.25 V. The positive electrode material layer comprises a positive electrode active material doped or coated with a metal element and a compound of structural formula I. The positive electrode plate satisfies the following conditions: 50≤m≤10000, 50≤n≤10000 and 2.8≤k≤3.8, wherein m is the content of the compound of structural formula I in the positive electrode material layer; n is the total content of the metal element doped in and coated on the positive electrode material layer; and k is the compaction density of the positive electrode material layer. The solution obtained after the positive plate is subjected to ultrasonic oscillation in a solvent is analyzed by means of a liquid chromatography-mass spectrometer (LC-MS), and characteristic peaks appear in the region with the retention time of 6.5-7.5 min.
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 4/485 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
aqyz21231233 being an unsaturated hydrocarbon group having 2-5 carbon atoms. The positive electrode sheet meets the following conditions: 0.05≤(b/10)*(h/x)≤15, 0.005≤b≤1, 0.7≤x≤1, and 80≤h≤140, b being the mass percentage content of the compound represented by formula II in the positive electrode material layer, x being the molar ratio of Ni element: (Ni element + Co element + M element) in the high-nickel positive electrode material, and h being the thickness of the positive electrode material layer on a single side of the positive electrode current collector.
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
66 and LiFSI, and the additive comprising a compound represented by structural formula (1). The lithium-ion battery meets the following conditions: 0.5≤d/b+a≤5, and 0.05≤d/c≤6; and 0.1≤a≤1.5, 0.1≤b≤1.0, 0.02≤c≤2, and 0.1≤d≤0.7. The lithium-ion battery can effectively inhibit the corrosion of an aluminum foil while the impedance of the lithium-ion battery is reduced and the cycle capacity of the lithium-ion battery is improved.
21212122; and the lithium-ion battery satisfies the following conditions: (IX), (X). The lithium-ion battery of the present invention effectively improves battery safety performance.
1212122 at least contain one sulfur atom; and the non-aqueous electrolyte solution satisfies the following conditions: 0.02 ≤ an/m ≤ 9, 0.01% ≤ a ≤ 5%, 5% ≤ m ≤ 70%, and 8% ≤ n ≤ 25%. Moreover, the present invention further discloses a secondary battery comprising the above non-aqueous electrolyte solution. According to the non-aqueous electrolyte solution provided in the present invention, the internal resistance of the battery is effectively reduced and the fast charging performance and the cycling performance of the battery are improved by limiting the content relation of the compound as represented by structural formula 1, the carboxylic ester and the electrolyte salt.
xyz1-y-z22, M being at least one element selected from Mn and Al; the positive electrode active material is doped or coated with an element E, the element E being one or more selected from Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co and P; the potential range of the positive electrode active material relative to metal lithium is greater than or equal to 4.25 V. The non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprising a compound represented by structural formula 1. The lithium ion battery satisfies the following conditions: 0.1≤(H/T)×M/1000≤10, wherein 80≤H≤150, 0.005≤T≤0.8 and 0.05≤M≤3. The lithium ion battery provided by the present invention has relatively low battery impedance and excellent high-temperature cycle performance.
H01M 10/0567 - Liquid materials characterised by the additives
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
In order to solve the problem that the high-temperature storage performance and the rate capability of existing lithium ion batteries are difficult to be considered at the same time, the present invention provides a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode, and a non-aqueous electrolyte. The positive electrode material layer comprises a positive electrode active material; the positive electrode active material is doped or coated with one or more structurally stable elements of Mg, Al, Zr, W, F and B and one or more solid oxygen elements of Ti, Cr, Mo and rare earth elements; the non-aqueous electrolyte comprises a solvent, an electrolyte salt, and an additive; the additive comprises a compound represented by a structural formula (1); and the lithium ion battery satisfies the following condition: 0.01≤a×b/(c+d)≤60. According to the lithium ion battery provided by the present invention, the rate capability and the high-temperature storage performance of the battery can both be effectively improved.
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
Provided is a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte, the layer comprises a positive electrode active material, the material comprises LixNiyCozM1-y-zO2, M is at least one element selected from Mn and Al, the material is doped or coated with an element E, which is selected from one or more of Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co, and P, a potential range of the positive electrode active material with respect to lithium metal is ≥4.25V;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a compound represented by structural formula 1:
Provided is a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte, the layer comprises a positive electrode active material, the material comprises LixNiyCozM1-y-zO2, M is at least one element selected from Mn and Al, the material is doped or coated with an element E, which is selected from one or more of Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co, and P, a potential range of the positive electrode active material with respect to lithium metal is ≥4.25V;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a compound represented by structural formula 1:
the lithium ion battery meets the following requirements:
Provided is a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte, the layer comprises a positive electrode active material, the material comprises LixNiyCozM1-y-zO2, M is at least one element selected from Mn and Al, the material is doped or coated with an element E, which is selected from one or more of Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co, and P, a potential range of the positive electrode active material with respect to lithium metal is ≥4.25V;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a compound represented by structural formula 1:
the lithium ion battery meets the following requirements:
0.1≤(H/T)×M/1000≤10; and
Provided is a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte, the layer comprises a positive electrode active material, the material comprises LixNiyCozM1-y-zO2, M is at least one element selected from Mn and Al, the material is doped or coated with an element E, which is selected from one or more of Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co, and P, a potential range of the positive electrode active material with respect to lithium metal is ≥4.25V;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a compound represented by structural formula 1:
the lithium ion battery meets the following requirements:
0.1≤(H/T)×M/1000≤10; and
80≤H≤150,0.005≤T≤0.8,0.05≤M≤3.
Provided is a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte, the layer comprises a positive electrode active material, the material comprises LixNiyCozM1-y-zO2, M is at least one element selected from Mn and Al, the material is doped or coated with an element E, which is selected from one or more of Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co, and P, a potential range of the positive electrode active material with respect to lithium metal is ≥4.25V;
the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a compound represented by structural formula 1:
the lithium ion battery meets the following requirements:
0.1≤(H/T)×M/1000≤10; and
80≤H≤150,0.005≤T≤0.8,0.05≤M≤3.
The lithium ion battery provided by the application has a lower battery impedance and excellent high-temperature cycle performance.
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
The present invention relates to the technical field of chemical engineering, and in particular to a linear carbonate and a preparation method thereof, which includes one or more of compounds of structural formula 1 below:
The present invention relates to the technical field of chemical engineering, and in particular to a linear carbonate and a preparation method thereof, which includes one or more of compounds of structural formula 1 below:
The present invention relates to the technical field of chemical engineering, and in particular to a linear carbonate and a preparation method thereof, which includes one or more of compounds of structural formula 1 below:
wherein R1 and R2 are respectively selected from one of alkyl groups containing 1˜4 carbon atoms;
The present invention relates to the technical field of chemical engineering, and in particular to a linear carbonate and a preparation method thereof, which includes one or more of compounds of structural formula 1 below:
wherein R1 and R2 are respectively selected from one of alkyl groups containing 1˜4 carbon atoms;
a hydroxyl concentration of the linear carbonate is no more than 100 ppm, and a free acid conversion rate of a solution with a concentration of 1 mol/L as formulated from the linear carbonate and lithium hexafluorophosphate is less than 1.2 after storage under 25° C. for 30 days. An acidity conversion rate was reduced when lithium hexafluorophosphate is dissolved in the linear carbonate by controlling the hydroxyl concentration, the energy density, discharge capacity, safety performance and service life of a battery can be improved when it's electrolyte solution contains the linear carbonate.
In order to overcome the problem of insufficient high-temperature cycle performance and high-temperature storage performance of an existing battery with a manganese-based positive electrode material caused by the dissolution of manganese ions in the battery, the present invention provides a secondary battery. The secondary battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte solution, wherein the positive electrode comprises a positive electrode material layer containing a positive electrode active material, and the positive electrode active material comprises a manganese-based material; and the non-aqueous electrolyte solution comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound as represented by structural formula (1): the secondary battery satisfies the following conditions: 0.05 ≤ 100×W×u/(q×s) ≤ 5, where 2.0 g/Ah ≤ W ≤ 4.5 g/Ah, 0.05% ≤ u ≤ 3.5%, 5% ≤ q ≤ 65%, and 10 mg/cm2≤ s ≤ 30 mg/cm2. The secondary battery provided in the present invention has a relatively high capacity retention ratio in the processes of cycling and high-temperature storage, and has relatively good cycling and storage performance.
122 are respectively selected from one of alkyl groups containing 1-4 carbon atoms; the hydroxyl concentration of the linear carbonate is not greater than 100 ppm, and after a solution prepared from the linear carbonate and lithium hexafluorophosphate and having a concentration of 1 mol/L is sealed and stored for 30 days at a constant temperature of 25°C, then a free acid conversion rate is less than 1.2. According to the present invention, the hydroxyl concentration in the linear carbonate is controlled to reduce an acidity conversion rate after lithium hexafluorophosphate is dissolved, so that when the linear carbonate is used as an electrolyte solvent, the energy density and the discharge capacity of a battery can be improved, the safety performance of the battery can be better improved, and the service life of the battery can be prolonged.
In order to overcome the problem of power reduction in the long-term cycling of an existing lithium iron phosphate battery, the present invention provides a lithium-ion battery, comprising: a positive electrode, a negative electrode and a non-aqueous electrolyte solution, wherein the positive electrode comprises a positive electrode material layer containing a positive electrode active material, and the positive electrode active material comprises a lithium iron phosphate composite material comprised of lithium iron phosphate and a carbon coating layer that coats the surface of the lithium iron phosphate; and the non-aqueous electrolyte solution comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound as represented by structural formula 1 and vinylene carbonate. The lithium-ion battery satisfies the following condition: 0.1 ≤ (W1/W2) × (Ma+Mb)/100 ≤ 4. The lithium-ion battery provided in the present invention has a relatively stable passivation film formed on the positive electrode material layer, and the passivation film can inhibit the side reaction of the non-aqueous electrolyte solution on the surface of the positive electrode active material having a strong oxidizing property, and improve the cycle performance.
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 4/583 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
In order to overcome the problems of battery expansion and capacity attenuation of an existing lithium-ion battery under long-term high-temperature cycles, the present invention provides a lithium-ion battery, which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte. The non-aqueous electrolyte comprises an additive A, an additive B and an additive C. The lithium-ion battery meets the following condition: 0.015≤(a+b+c)×V≤0.09. For the lithium-ion battery provided in the present invention, when the formula of 0.015≤(a+b+c)×V≤0.09 is met, the problem of gas production of the electrolyte under long-term high-temperature cycles can be effectively solved, and the expansion rate of the battery is effectively reduced. Meanwhile, the additives can be subjected to a special oxidation reaction on the positive electrode surface under the catalysis of a high voltage, and then a more stable and superior positive-electrode protective film is formed, such that the positive electrode is better protected, and thus the capacity retention rate of the battery under long-term high-temperature cycles is effectively improved.
1+xyz1-y-z21+C2-dd424mnn] formula (A) The secondary battery satisfies the following conditions: 0.5 ≤ 100(a + b) / q ≤ 10, 0.02％ ≤ a ≤ 2％, 0％ ≤ b ≤ 2.5％, and 20％ ≤ q ≤ 65％. The secondary battery provided by the present invention effectively inhibits and reduces divalent manganese ions dissolved out of a manganese-containing compound during a cycling process of the battery, optimizes a positive and negative electrode interface structure, improves the capacity retention rate of the high-temperature cycle of the battery, and reduces the impedance growth rate.
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
1212122 at least contain one sulfur atom; and the secondary battery satisfies the following conditions: (VI), where 40%≤m≤90%, 0.05%≤n≤2%, 1.2 g/cm3≤r≤1.8 g/cm3, and 5%≤S≤30%. The secondary battery provided in the present invention can improve the high-temperature storage performance of the battery on the premise of ensuring that the battery has an excellent energy density.
The present invention relates to the technical field of lithium batteries, and in particular, to a lithium battery separator and a lithium battery. The separator comprises a block polymer, the porosity of the separator is p, the mass percentage of the block polymer relative to the separator is w, and the relationship between the porosity p of the separator and the relative mass percentage w of the block polymer satisfies that (1-w)/3
In order to overcome the problem of an insufficient high-temperature performance of existing secondary batteries, the present invention provides a secondary battery. The secondary battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, and the positive electrode active material comprises a cobalt-containing compound; the negative electrode comprises a negative electrode material layer; and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and a compound as represented by structural formula 1, wherein R1 is selected from an unsaturated hydrocarbyl group having 3-6 carbon atoms, R2 is selected from an alkylene group having 2-5 carbon atoms, and n = 1 or 2. The secondary battery satisfies the condition (aa). The secondary battery provided in the present invention effectively reduces the damage, to a highly compacted negative electrode, of Co ions dissolved out from the cobalt-containing compound during a cycling process of the battery, reduces the capacity loss of the secondary battery during high-temperature cycling, and improves the high-temperature cycling performance of the secondary battery.
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
90.
Method for purifying ethylene carbonate through dynamic crystallization
The present invention relates to the technical field of chemical industry, and in particular to a method for purifying ethylene carbonate through dynamic crystallization, which includes the following steps: adding an ethylene carbonate-containing raw material into a cavity of a crystallization device under a condition of stirring for dynamic crystallization, wherein the crystallization device further includes a jacket attached and circumferentially disposed along the outer wall of the cavity, the jacket is provided with cooling water therein, a temperature of the cooling water is 1-2.5° C. lower than the temperature in the cavity until a granular ethylene carbonate crystal is generated. The present invention using a rake dryer as the crystallization device to realize dynamic crystallization at a certain rotating speed. The technical solution is simple to operate and short in processing cycle, which facilitates improvement in production efficiency and product quality and is suitable for industrial application.
In order to overcome the problems of an insufficient quick-charging performance, an insufficient high-temperature storage performance, and the impedance growth during high-temperature cycling of existing lithium-ion batteries, the present invention provides a lithium-ion battery, which comprises a positive electrode containing a positive electrode material layer, a negative electrode containing a negative electrode material layer, and a non-aqueous electrolyte solution, wherein the positive electrode material layer comprises a magnesium-containing lithium transition metal oxide as a positive electrode active substance, the negative electrode material layer comprises a negative electrode active substance and a magnesium-containing compound, and the non-aqueous electrolyte solution comprises a carboxylic ester solvent, an electrolyte salt and a compound shown in structural formula 1: in which, R1 is selected from an unsaturated alkyl having 3-6 carbon atoms, R2 is selected from an alkylene having 2-5 carbon atoms, and n = 1 or 2. The lithium-ion battery satisfies the following conditions: 0.002 ≤ m/x ≤ 0.25, and 0.001 ≤ m/z ≤ 0.1. Under the premise of maintaining the excellent high-temperature performance of the battery, the present invention ensures that the battery has a relatively low impedance growth rate and that the reliability of the battery during long-term cycling is improved.
122 is selected from C2-C5 hydrocarbylene groups, and n=1 or 2; the lithium secondary battery satisfies the following condition: 0.05≤a×(b+c)≤3. According to the lithium secondary battery provided in the present invention, the compound shown in structural formula 1 in the electrolyte can effectively inhibit cobalt ions from dissolving out and repair the damage to a negative electrode SEI film by dissolved cobalt ions, and can mitigate the transfer problem of lithium ions in a battery charging and discharging cycle process caused by doping metal elements, reduce battery impedance and battery polarization, and slow down lithium precipitation of the battery, such that the battery can have good high-temperature cycle performance.
The present invention relates to the technical field of electrochemistry, specifically to a solid-state electrolyte and a secondary battery. The solid-state electrolyte of the present invention comprises a polymer A' and a polymer B', wherein the polymer A' is a long-chain molecular compound containing a polyethylene glycol unit; the polymer B' is a chain compound containing an amide group; and the polymer A' and the polymer B' form a dynamic cross-linking network by means of a non-covalent bond. The polymer A' provides a flexible interface for the solid-state electrolyte, an amide bond in the polymer B' provides a hydrogen bond cross-linking point, and the polymer B' and the polymer A' form a dynamic cross-linking network in the form of a non-covalent bond by means of the crosslinking of hydrogen bonds, so as to adapt to the volume change of an electrode during the charge-discharge process, thereby improving the capacity and cycling stability of a polymer solid-state battery.
In order to overcome the problem of metal dendrites caused by uneven deposition on the surface of the existing metal electrode, the present application provides a metal electrode, comprising a metal layer and a coating, the coating comprises at least one block copolymer; the block copolymer comprises a first polymer block for independently conducting metal ions and a second polymer block for providing mechanical strength; a shear modulus of the coating is ≥107 Pa, and a thickness of the coating is 500 nm-50 μm. Meanwhile, the application also discloses a battery comprising the metal electrode. The metal electrode provided by the application has good ionic conductivity and inhibition capability for metal dendrite.
The present invention relates to the technical field of solid-state lithium batteries, and specifically relates to a solid-state lithium battery, which comprises a positive electrode, a negative electrode and a polymer solid-state electrolyte located between the positive electrode and the negative electrode. The polymer solid-state electrolyte comprises a polymer, the positive electrode comprises a positive electrode material layer, and the positive electrode material layer comprises a positive electrode active substance and a compound as shown in a structural formula 1. The solid-state lithium battery satisfies the following conditions: 5≤uL/wd≤500; u being a mass percentage of the polymer in the total mass of the polymer solid-state electrolyte, and the unit being %; w being the mass percentage of the compound shown in structural formula 1 in total the mass of the positive electrode active material, the unit being %; L being the thickness of the positive electrode material layer, the unit being μm; and D being the thickness of the polymer solid-state electrolyte, the unit being μm. The positive electrode used in the solid-state lithium battery of the present invention is doped with an unsaturated phosphate compound, decreasing the probability that an end group of a polymer macromolecular chain is broken due to attack, and improving the cycle stability of the solid-state lithium battery.
166 are each independently selected from a hydrocarbyl having a carbon number of 1-5, a siloxy substituted or unsubstituted by a hydrocarbyl having a carbon number of 1-3, or hydrogen; and the positive electrode and the negative electrode are both porous carbon materials, and the porous carbon materials and the compound as shown in structural formula 1 meet the conditions of formula 2. The supercapacitor provided in the present invention has a relatively low ESR (equivalent series resistance) and a relatively good high-and-low temperature performance.
The present invention relates to the technical field of chemical engineering, specifically to a method for purifying ethylene carbonate by means of dynamic crystallization. The method comprises the following steps: adding an ethylene carbonate-containing raw material to a cavity of a crystallization apparatus via a feeding port of the crystallization apparatus under stirring conditions for dynamic crystallization, wherein the crystallization apparatus further comprises a jacket which is attached to and arranged around the outer wall of the cavity, and cooling water is provided in the jacket; and controlling the temperature of the cooling water in the jacket to be lower than the temperature in the cavity by 1-2.5°C until granular ethylene carbonate crystals are generated. In the present invention, a rake dryer is used as the crystallization apparatus, the characteristic that the rake dryer can treat a large number of materials is utilized, the range of the difference between the temperature in the cavity of the rake dryer and the temperature of the cooling water in the jacket is controlled, and dynamic crystallization is achieved at a certain rotating speed. By using the technical solution involved in the present invention, the method is simple to operate, has a short treatment period, and is conducive to improving the production efficiency and the product quality and suitable for industrial application.
In order to solve the problem of insufficient safety performance of an existing secondary battery, the present invention provides a secondary battery positive electrode plate, comprising a positive electrode material layer. The positive electrode material layer comprises a positive electrode active material and a compound represented by structural formula 1: structural formula 1. The positive electrode active material comprises an M element, the M element is selected from one or two of Mn and Al, and the positive electrode material layer satisfies the following condition: 0.05≤p*u/v≤15, wherein u is the mass percentage content of the phosphorus element in the positive electrode material layer, and the unit of u is wt%; v is the mass percentage content of the M element in the positive electrode material layer, and the unit of v is wt%; and p is the surface density of a single side of the positive electrode material layer, and the unit of p is mg/cm2. At the same time, also disclosed in the present invention is a secondary battery comprising the positive electrode plate. According to the present invention, factors of the compound represented by structural formula 1, the Mn and Al elements and the surface density of the single side are reasonably quantified, so as to obtain the secondary battery having high energy density and excellent safety performance.
1+xab1-a-b2-yy1+zc2-c4-ddd formula (2); and the positive electrode material layer meets the following condition: 0.05 ≤ p·u/v ≤ 15, wherein u is the mass percentage content of phosphorus element in the positive electrode material layer, the unit being wt%; v is the mass percentage content of an M element in the positive electrode material layer, and the M element is selected from one or two of Mn and Al, the unit being wt%; and p is the single-side surface density of the positive electrode material layer, the unit being mg/cm2. The battery provided in the present invention has relatively high safety performance.
123122 is a C2-C6 unsaturated hydrocarbon group or an unsaturated halogenated hydrocarbon group. The secondary battery meets the following condition: 0.02 ≤ AW/100S ≤ 3, wherein A is the mass percentage of the compound shown in structural formula 1 in the non-aqueous electrolyte solution, the unit thereof being %; S is the specific surface area of a negative electrode active material, the unit thereof being m2/g; and W is the areal density of the negative electrode material layer, the unit thereof being g/m2. The battery provided in the present invention improves the cycle performance and storage performance at high temperatures, and also ensures that the battery has a relatively high energy density.
