Disclosed are an electrode plate and a battery. An electrode plate provided in the present disclosure includes a first current collector and a first functional layer disposed on at least one side of the first current collector, where a plurality of first regions and a plurality of second regions are alternately distributed on a surface of the first functional layer. A content ratio of an element oxygen to an element silicon in the first functional layer within the first region is greater than 4:1. The present disclosure provides the electrode plate and the battery, to at least resolve a problem of low initial efficiency of a lithium-ion battery, and increase battery capacity, thereby improving battery energy density.
A battery and an electronic device where the battery includes a battery cell assembly, a first shell and a terminal post disposed in the first shell; the first shell has a holding cavity, and the battery cell assembly is disposed in the holding cavity; the battery cell assembly includes a battery cell and a second shell encased outside the battery cell, the battery cell has a tab, the second shell includes a body and a sealing edge extending outwardly from an edge of one side of the body; the second shell has an opening on a side facing the tab, the sealing edge bends towards the body; the tab extends out of the second shell from the opening along a bending direction of the sealing edge, and the terminal post is electrically connected to the tab.
H01M 50/531 - Electrode connections inside a battery casing
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
A battery includes a battery cell and a packaging body, an edge of at least one side of the packaging body is provided with a sealing region to seal and wrap the battery cell body in the packaging body, and the packaging body includes a heat sealing layer; and in the sealing region, a side, away from the battery cell body, of the heat sealing layer is an outer sealing side, a side, close to the battery cell body, of the heat sealing layer is an inner sealing side, and a crystallinity of the outer sealing side is greater than a crystallinity of the inner sealing side. The battery includes the packaging body with a high packaging strength and a strong resistance to bending, which may more effectively block water vapor from entering a battery, and also improves safety performance and a service life of a battery.
H01M 50/129 - Primary casingsJackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
H01M 50/131 - Primary casingsJackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
A battery includes a first half housing, a second half housing and an arc-shaped battery cell. The first half housing and the second half housing are connected to enclose and form an arc-shaped accommodating cavity that matches the arc-shaped battery cell, and the arc-shaped battery cell is accommodated in the arc-shaped accommodating cavity. Disposal of the arc-shaped accommodating cavity enables a structure of an aluminum laminated film housing to match a structure of an arc-shaped battery cell, so as to facilitate an operation of encapsulating the arc-shaped battery cell in the aluminum laminated film housing, and to improve an effect of fixing the arc-shaped battery cell in the aluminum laminated film housing, thereby reducing a probability of the arc-shaped battery cell moving relative to the aluminum laminated film housing, and thus achieving an technical effect of improving a safety of an arc-shaped battery.
H01M 50/503 - Interconnectors for connecting terminals of adjacent batteriesInterconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
A battery and an electronic device. The battery includes a battery cell, a housing, an insulating member and a connecting sheet, where the housing is provided with an accommodating cavity, and the battery cell is disposed in the accommodating cavity; a side wall of the housing is provided with a notch, the insulating member is mounted at the notch, and the insulating member is provided with a mounting hole; the connecting sheet is disposed on the insulating member and is provided with a protruding part, the protruding part penetrates through the mounting hole and extends to inside of the housing, and the protruding part is electrically connected with a tab assembly of the battery cell. The electronic device includes the battery. Capacity density of the battery is improved without changing the size of the battery.
H01M 50/588 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
H01M 10/04 - Construction or manufacture in general
The battery in the embodiments of the present application includes a battery body and a protective glue layer. The protective glue layer includes a first adhesive segment and a second adhesive segment that are circumferentially coated on an outer peripheral wall of the battery body, and the first adhesive segment and the second adhesive segment have a connecting notch formed therebetween in a circumferential direction of the outer peripheral wall; both a width of the first adhesive segment and a width of the second adhesive segment are less than a thickness of the battery body in a first direction, to form an exposed area; and part of the outer peripheral wall of the battery body is exposed outside the protective glue layer through the connecting notch and the exposed area.
Disclosed are a positive electrode material, and a positive electrode plate and a battery including the positive electrode material. The positive electrode material has a special phase structure distinct from that of a conventional lithium cobalt oxide material. The positive electrode material may present a plurality of small charging and discharging platforms in a charging and discharging process. Compared with a conventional high-voltage lithium cobalt oxide material, the positive electrode material exhibits the following advantage in terms of electrochemical performance: under a condition that a charge-discharge cut-off voltage and a charge and discharge rate remain the same, the positive electrode material has higher gram capacity performance and cycling performance. Specifically, compared with an undoped compound that belongs to a P63mc space group and has an O2 phase packed structure, the compound has higher gram capacity and better cycling performance due to an effect of element potassium.
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 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
A jelly roll includes a first electrode plate and a second electrode plate that are disposed in a stacked manner. The tail end of the first electrode plate is a first foil uncoating region; the tail end of the second electrode plate is a second foil uncoating region; and the jelly roll includes a first bending region disposed at an outermost side of the jelly roll, the tail end of the first electrode plate and the tail end of the second electrode plate are both located in the first bending region, and neither of projections, in a thickness direction of the jelly roll, of the first foil uncoating region and the second foil uncoating region exceeds the first bending region. The present disclosure solves problems of being unable to ensure both safety and an energy density of a battery.
H01M 10/04 - Construction or manufacture in general
H01M 50/463 - Separators, membranes or diaphragms characterised by their shape
H01M 50/474 - Spacing elements inside cells other than separators, membranes or diaphragmsManufacturing processes thereof characterised by their position inside the cells
The present application relates to the field of battery technologies, and provides a battery and an electronic device, so as to solve the problem that the battery structures in the related art cannot relatively well ensure safety performance of batteries. The battery includes a housing, a battery cell module, a first connecting member, a second connecting member and an insulating separating member. The first connecting member and the second connecting member are electrically connected to electrodes of opposite charges. In a first direction of the housing, at least a part of the separating member is located between the first connecting member and the second connecting member.
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
H01M 50/528 - Fixed electrical connections, i.e. not intended for disconnection
H01M 50/531 - Electrode connections inside a battery casing
Disclosed are a separator and a battery including the same. An adhesive layer of the separator includes a composite material with a fibrous core-shell structure. In the composite material with a fibrous core-shell structure, the nitrogen-containing phosphate compound is encapsulated in a vinylidene fluoride polymer. When the battery is used at room temperature, the encapsulation structure is stable, the nitrogen-containing phosphate compound is encapsulated in the vinylidene fluoride polymer and stably exists in the separator, without affecting the electrical performance of the battery. In addition, the fibrous vinylidene fluoride polymer can perform excellent at bonding, and tightly bonds the separator to the positive electrode plate and negative electrode plate together, ensuring that the battery does not deform during the cycle. The battery can effectively improve the safety performance while taking into account performance of the battery at high and low temperatures.
A battery cell includes a battery cell body and a packaging body having a sealing strip that surrounds the battery cell body. The sealing strip is sequentially formed with a first edge, a middle line and a second edge; and a peel force of the sealing strip at the first edge is greater than a peel force of the sealing strip at the middle line. When the battery cell body has a tendency to rupture the sealing strip and subsequently detach from the packaging body, even if first line of protection at a side, close to the battery cell body, of the sealing strip is ruptured, a sealing is also reinforced at the first edge on a side, away from the battery cell body, of the sealing strip, which constructs second line of protection on the sealing strip, thereby solving a problem of safety risks caused by insufficient packaging strength.
An electrochemical device, comprising a first electrode sheet (1), a separator (3) and a second electrode sheet (2) that are sequentially stacked. The separator (3) comprises a porous layer formed of nanofibers; and the density of the nanofibers varies in the thickness direction of the separator (3). A change of the density of the nanofibers in the thickness direction of the separator (3) can ensure that there is sufficient free electrolyte on the side of the separator (3) facing the first electrode sheet (1) or the second electrode sheet (2), thereby facilitating the improvement of rate capability and cycle life.
Disclosed are an electrolyte solution and a battery. The electrolyte solution in the present disclosure includes an organic solvent, a lithium salt, an additive A, an additive B, and an additive C, where the additive A is carbon-linked disulfonate; the additive B is a polycyano nitrile compound; and the additive C is a bis(fluorosulfonyl)imide salt. The electrolyte solution can improve high-temperature performance of the battery, involves a simple process and low costs, and achieves a good protection effect.
Disclosed are a battery separator and a battery. The battery separator includes a substrate, a first coating layer and a second coating layer, and the first coating layer and the second coating layer are arranged opposite to one another on two sides of the substrate; the first coating layer includes first polymer particles and inorganic particles; and the second coating layer includes second polymer particles; Dv10 of the first polymer particles is denoted as A, and Dv50 of the first polymer particles is denoted as B; Dv90 of the inorganic particles is denoted as C; and 0.2≤A/C≤5; and 1≤B/C≤40. The battery separator of the present disclosure adheres well to an electrode plate in a battery cell, giving the battery cell excellent low-temperature dynamic performance. Meanwhile, the battery containing the battery has excellent safety performance and cycling performance.
H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
H01M 50/414 - Synthetic resins, e.g. .thermoplastics or thermosetting resins
Disclosed are a battery electrolyte solution and a battery. The battery electrolyte solution includes an organic solvent, an additive, and an electrolyte salt, and the electrolyte solution is in contact with a negative electrode plate; the organic solvent includes an ethyl group solvent, the additive includes fluoroethylene carbonate, the electrolyte salt includes a lithium salt, and percentages of the ethyl group solvent, the fluoroethylene carbonate, and the lithium salt in a total mass of the electrolyte solution are configured as follows: 0.4−N3≤A+B2+C2≤5.2−N3, where N denotes a peeling strength value of the negative electrode plate, A, B, and C respectively denote a percentage of the mass of the ethyl group solvent, the fluoroethylene carbonate and the lithium salt in the total mass of the electrolyte solution.
H01M 10/0567 - Liquid materials characterised by the additives
C07D 327/10 - Heterocyclic compounds containing rings having oxygen and sulfur atoms as the only ring hetero atoms two oxygen atoms and one sulfur atom, e.g. cyclic sulfates
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0568 - Liquid materials characterised by the solutes
H01M 10/0569 - Liquid materials characterised by the solvents
The present application provides a battery and an electronic device. The battery provided by the present application includes a battery cell, an outer shell assembly and a first connecting assembly. The outer shell assembly includes a pole and an outer shell, and the outer shell has an accommodate chamber, and the battery cell is disposed in the accommodate chamber. The first connecting assembly includes a first connector and a second connector, the first connector is connected to a tab of the battery cell, the second connector is connected to the pole, the first connector has a first engaging portion, the second connector has a second engaging portion, the first engaging portion and the second engaging portion are engaged with each other. The present application provides a battery and an electronic device, improving the production qualification rate of battery.
An isolation layer (3) and an electrochemical device. The isolation layer (3) comprises a fiber material, wherein the fiber material includes 5-60 hub nodes per 100 μm2; and/or, the number of fibers connected to each hub node is 2-30. The isolation layer (3) can effectively isolate a positive electrode sheet from a negative electrode sheet and ensure the normal passage of lithium ions, and can reduce the self-discharge level of a battery and prolong the service life of the battery. The electrochemical device comprises a first electrode sheet (1), an isolation layer (3) and a second electrode sheet (2), which are sequentially stacked, wherein the isolation layer (3) includes a porous layer formed by means of a fiber material; and the density of the fiber material in the thickness direction of the isolation layer (3) is variable. The electrochemical device can ensure that there is sufficient free electrolyte on the side of the isolation layer (3) facing the first electrode sheet (1) or the second electrode sheet (2), thereby facilitating an improvement to the rate capability and the cycle life.
H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
A battery includes a negative electrode plate and an electrolyte solution. The negative electrode plate includes a single-sided region and a double-sided region; the double-sided region is a double-side coated area, and a total thickness of double-sided coating layers is Y, in a unit of mm. and a thickness of a single-sided coating layer is X, in a unit of mm; a ratio A of a thickness of the single-sided coating layer to a thickness of the double-sided coating layers ranges from 0.5 to 0.65; the electrolyte solution includes ethyl propionate and/or propyl propionate; based on a total weight of the electrolyte solution, a content B wt % of the ethyl propionate ranges from 0 wt % to 50 wt %, and a content C wt % of the propyl propionate ranges from 0 wt % to 60 wt %; then, 2B+C≥400*(A−0.5).
A battery includes a positive electrode material with a complete crystalline structure. The positive electrode material meets 1.3≤I003/I104≤3, 0.02≤I006/I003≤0.15, and 0.06≤I006/I104≤0.15. The battery further includes an electrolyte solution, the electrolyte solution includes a first additive, the first additive includes a nitrile compound, and the electrolyte solution meets the following relational expression: 3%≤B≤6%, where B is a percentage of a mass of the nitrile compound in a total mass of the electrolyte solution. The positive electrode material has high thermal stability, which is conducive to improving a hot box pass rate of the battery and improving high temperature storage performance and cycling performance of the battery.
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 10/0567 - Liquid materials characterised by the additives
A positive electrode sheet and application thereof, where the positive electrode sheet includes a positive electrode current collector, an undercoat layer and a positive electrode active layer, the undercoat layer being located on at least one surface of the positive electrode current collector, and the positive electrode active layer being located on a surface of the undercoat layer far away from the positive electrode current collector; where, the undercoat layer includes a first carbon material, and a powder resistivity of the first carbon material is not lower than 0.2 Ω·cm. The undercoat layer included in the positive electrode sheet of the present application has high impedance, and when mechanical abuse occurs, the lithium-ion battery is not prone to thermal runaway, effectively improving the safety of battery.
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
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 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
Disclosed are a separator and a battery cell. The separator is used for being winded together with an electrode plate to prepare a battery cell, and the separator includes: a first section, a second section and a third section which are sequentially arranged in a length direction of the separator. A width of the first section is less than a width of the second section, and/or, a width of the third section is less than the width of the second section.
Disclosed are a negative electrode material, a negative electrode plate including the negative electrode material and a battery including the negative electrode material. The negative electrode material includes an MOF@ carbon composite material and a silicon-based material. The negative electrode material of the present disclosure has good flexibility and scalability, which not only solves a problem of expansion of the negative electrode material in a battery charging process, but also enables the negative electrode to keep good electrical contact all the time in a battery discharging and shrinkage process.
Disclosed are a negative electrode material, and a negative electrode plate and a battery including the negative electrode material. The negative electrode material includes a silicon material and a carbon material. The silicon material is distributed on a surface and in a pore of the carbon material, to form a silicon-carbon composite material that serves as a core. A surface of the silicon-carbon composite material is coated with a thin protective layer as a shell layer. The carbon material in the negative electrode material has a relatively large quantity of pores that may accommodate the silicon material and provide buffer space for volume expansion of the silicon material. In this way, the battery has a low cycling volume expansion rate.
H01M 4/02 - Electrodes composed of, or comprising, active material
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 4/587 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
24.
BATTERY CELL AND PREPARATION METHOD THEREOF, AND BATTERY
A battery cell includes a battery cell body including a tab and a packaging body including a first sealing adhesive layer, the first sealing adhesive layer includes first and second sealing regions, and along a direction from the battery cell body to the tab, a size of a cross section of the first sealing region is greater than a size of a cross section of the second sealing region. In the battery cell, a structure of a sealing adhesive layer is improved, which improves an adhesion strength and a peeling force between a tab and a packaging body, so as to improve a packaging strength at a tab, thereby improving a packaging quality of a battery cell, and thus ensuring an effective safety service life of a battery, and solving a problem of a failure of a battery cell caused by inadequate sealing at a tab of a battery cell.
A positive electrode plate includes a positive electrode active layer, and a protective electrode protective layer arranged between a positive electrode current collector and the positive electrode active layer; the positive electrode protective layer includes conductive particles and a binder; and the conductive particles are an inorganic filler with a conductive coating layer on a surface. The positive electrode protective layer is arranged to avoid a contact-type short circuit between the positive electrode current collector and a negative electrode active layer when a lithium-ion battery is mechanically abused. In addition, there is a wide conductive network in the positive electrode protective layer, so the lithium-ion battery has excellent safety performance and cycling performance.
A battery. The battery comprises a negative-electrode sheet and an electrolyte, wherein the negative-electrode sheet comprises a negative-electrode current collector and a negative-electrode active material layer, which is located on one side or two sides of the negative-electrode current collector, the negative-electrode active material layer has a recess, the depth of the recess is h, with the unit being μm, the width of the recess is d, with the unit being μm, the surface tension of the electrolyte is σ, with the unit being mN/m, the density of the electrolyte is ρ, with the unit being g/cm3, and the battery meets 0.5≤(h+σ)/(d+ρ)<3.5. The battery can ameliorate the problem of lithium precipitation at a side wall of a recess in the surface of a negative electrode, so that a relatively high coulombic efficiency of the battery is ensured, and the cycle life of the battery can also be prolonged.
A spinning layer and a battery comprising the spinning layer. The spinning layer includes nanofibers and inorganic particles, wherein the inorganic particles include first inorganic particles and/or second inorganic particles, the first inorganic particles being embedded inside the nanofibers, and the second inorganic particles being embedded in pores of an organic spinning base material having a porous structure formed by the nanofibers and/or being located on the surface of the organic spinning base material. The spinning layer has a small and uniform pore size and high air permeability, thereby reducing the impedance and the performance of self-discharge level of the battery; and the battery comprising the spinning layer has a low self-discharge level and a low impedance.
H01M 50/414 - Synthetic resins, e.g. .thermoplastics or thermosetting resins
H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
D04H 1/728 - Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
D04H 1/413 - Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties containing granules other than absorbent substances
Disclosed are an electrolyte solution and a battery including the electrolyte solution. The electrolyte solution includes an organic solvent, an electrolyte salt, and an additive A; and the additive A is a selenocyanate salt. In the present disclosure, the following effects are achieved by oxidatively decomposing an electrolyte additive at a positive electrode to form a CEI film that has a high strength and is rich in inorganic matter: oxidative decomposition side reactions of the electrolyte solution are greatly reduced; and a loss of a positive electrode active material at a high temperature and a high pressure is decreased. Therefore, performance of a battery at a high temperature and a high pressure is improved, and cycling stability and high-temperature stability of the battery are improved.
Disclosed are a positive electrode plate, a battery cell, and a battery. The positive electrode plate includes a current collector, an active material layer, a first and a second insulation layer, where the current collector includes a first and a second surface disposed opposite each other; first surface includes a first, a second, and a third region along a short side; and second surface includes a fourth, a fifth, and a sixth region along a short side; active material layer is disposed in second and fifth region; first insulation layer is disposed in the first, third, fourth, and sixth region; and second insulation layer is disposed on active material layer and first insulation layer. The positive and negative electrode plate have a same width, to resolve a problem of poor coverage of a positive electrode and a negative electrode, thereby greatly improving safety of a battery.
H01M 50/474 - Spacing elements inside cells other than separators, membranes or diaphragmsManufacturing processes thereof characterised by their position inside the cells
The present disclosure relates to the field of batteries, and particularly to a positive electrode sheet and a battery comprising the positive electrode sheet. The positive electrode sheet comprises a positive current collector and a positive coating on at least one side surface of the positive current collector, wherein the positive coating comprises a positive active material, a binder and a conductive agent, the conductive agent comprising a first conductive agent and a second conductive agent. A thermogravimetric analysis test curve of the positive electrode sheet comprises at least three weight-loss intervals at 150-600℃, the first weight-loss interval being within 150℃ to 350℃, and the second weight-loss interval and the third weight-loss interval being within 350℃ to 600℃; and the weight-loss percentage of the first weight-loss interval being m1, and the sum of the weight-loss percentage of the second weight-loss interval and the weight-loss percentage of the third weight-loss interval being m2, wherein 0.5％≤m1≤3％, 0.5％≤m2≤5％, and 0.1≤m1/m2≤4. The positive electrode sheet has a good high-temperature performance and a good high-temperature cycle performance in a high-voltage (the cut-off voltage≥4.45V) system.
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 10/0567 - Liquid materials characterised by the additives
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 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
66, generating less HF acid, further improving the high-temperature performance of batteries; additionally, the problem of thermal failure of batteries possibly caused by existing FECs in a high-temperature environment can be solved, thereby further improving the electrochemical performance and the safety performance of lithium-ion batteries in a high-temperature environment. The electrolyte is expected to provide lithium-ion batteries having higher electrochemical performance and safety performance to electric vehicles, mobile electronic devices, and large-scale energy storage systems, thereby promoting further development in these fields.
A housing and a battery, the housing comprising a base material layer (10), a metal layer (20) and a heat sealing layer (30) sequentially stacked along an X direction of the housing. The housing also comprises at least one heat insulation layer (40), the heat insulation layer (40) being disposed on a surface of the metal layer (20) close to the base material layer (10) and/or a surface of the metal layer (20) close to the heat sealing layer (30) and/or a surface of the base material layer (10) distant from the metal layer (20). By means of providing a heat insulation layer (40) in a housing, when the housing is used in a lithium-ion battery, heat transfer from a high-temperature external environment to the interior of the lithium ion battery can be prevented, thereby preventing fire and explosion caused by thermal runaway of the battery cell of the lithium-ion battery at high temperatures.
A battery and an electronic device. The battery comprises a first housing layer (10), a battery cell (20), and a second housing layer (30). The first housing layer (10) defines an accommodating space (101); the battery cell comprises a negative electrode sheet (212), the mass fraction of silicon contained in the negative electrode sheet (212) is 0%-90%, and the battery cell (20) is accommodated in the accommodating space (101); the second housing layer (30) covers the outer surface of the first housing layer (10); the thickness H1 of the first housing layer (10) and the thickness H2 of the battery cell (20) satisfy the relational expression H1=(1+mass fraction of silicon/2)*(0.0005-0.0025)*H2, and the thickness H1 of the first housing layer (10) and the thickness H3 of the second housing layer (30) satisfy the relational expression H1=(0.02-0.25)*H3. According to the battery, the problem in the prior art of pouch batteries being prone to volume expansion in a charging and discharging process can be solved.
H01M 50/107 - Primary casingsJackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
Disclosed are an electrode plate, a battery cell, and a battery. The electrode plate provided in the present disclosure includes a current collector and an active material layer disposed on at least one surface of the current collector. The active material layer includes active material, the active material includes a silicon-based material, a skeleton layer is provided outside the silicon-based material, and a proportion of a fluorine element gradually increases in a direction from the silicon-based material to the skeleton layer. The electrode plate, the battery cell, and the battery provided in the present disclosure are used to at least solve a technical problem that the battery is prone to volume expansion.
Disclosed are a negative electrode plate and a battery. The negative electrode plate includes a current collector and a coating layer disposed on at least one side surface of the current collector. The coating layer includes a silicon-containing material and a graphite material, and a median particle size Dv50 of the graphite material is smaller than a median particle size Dv50 of the silicon-containing material; and the silicon-containing material is a mixture of carbon and amorphous silicon, and a ray diffraction pattern of the silicon-containing material does not have an obvious diffraction peak of silicon, thereby improving an electric capacity of the negative electrode plate, decreasing the influence of volume expansion on a thickness of the electrode plate caused by lithium intercalation of the silicon-containing material, and reducing an expansion rate of the battery.
The present application relates to the technical field of batteries, and in particular relates to a positive electrode pole piece and a preparation method therefor, as well as a battery and a preparation method therefor. The positive electrode pole piece comprises a current collector, a non-active layer, an active material layer and a tab, the non-active layer and the active material layer being disposed on at least one side surface of the current collector. The active substance layer comprises an active substance, and the non-active layer does not comprise an active substance. Along an extension direction of the tab, the edge of the non-active layer extends past the edge of the active substance layer. The non-active layer provided by the present application not only has the function of protecting the current collector, but can also prevent transition band capacity loss without affecting the capacity utilization of the active substance.
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
The present application provides a battery and an electronic device. A first aspect of the present application provides a battery, comprising an electrolyte. Dimethyl carbonate is injected into the battery; after standing for 36 hours, sampling is performed and gas chromatography analysis is performed on the liquid in the battery; and based on the capacity of the battery, the liquid injection amount of dimethyl carbonate is not lower than 2.5 g/Ah; there is a first characteristic peak at 3.65-4.50 min, and there is a second characteristic peak at 4.95-6.50 min. According to the battery provided by the present application, a first functional auxiliary agent with a peak output time of 3.65-4.50 min and a second functional auxiliary agent with a peak output time of 4.95-6.50 min are detected in an electrolyte residual component, and the first functional auxiliary agent and the second functional auxiliary agent can continuously exist, so that the battery interface can be improved, the impedance of the battery is reduced, and the cycle performance of the battery is improved.
The present disclosure relates to the field of batteries, and specifically relates to a positive electrode material, a positive electrode sheet comprising the positive electrode material, and a battery comprising the positive electrode material. Elements in the positive electrode material at least comprise Co and Ni; and in the positive electrode material, the content of Co is 20-60% based on the total mass of the positive electrode material, and the mass ratio of Co to Ni is (1.1-20):1. The positive electrode material of the present disclosure has good electrochemical performance at a high voltage (4.5 V or higher).
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 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
The present application provides a battery cell and a battery. The battery cell comprises a first electrode sheet, a first separator, a second electrode sheet, and a second separator which are stacked in sequence; at least one of the head and the tail of the first electrode sheet is provided with a light foil surface; the light foil surface faces the first separator; the light foil surface is provided with a bonding layer; the first separator is bonded with the first electrode sheet by means of the bonding layer. Therefore, the battery cell can be wound as a whole, thereby avoiding the problems of wrinkling, electrode sheet dislocation and the like in the processes of starting winding and finishing winding, and improving the yield rate of a product.
A negative electrode sheet and a battery. The negative electrode sheet comprises a current collector (2) and an active material layer (1) provided on the surface of the current collector (2). The active material layer (1) comprises a silicon carbon material (11) and a first binder. The first binder contains a first group and a second group. The first group comprises a carboxyl group, and the second group comprises a cyano group and/or an amide group.
Provided in the present application are a battery cell (100) and a battery. The battery cell (100) comprises: a first electrode sheet (1), a separator (3) and a second electrode sheet (2), which are stacked and wound, wherein the first electrode sheet (1) and the second electrode sheet (2) each comprise a plurality of electrode sheet layers formed by means of winding; the first electrode sheet (1) and the second electrode sheet (2) have opposite polarities; the first electrode sheet (1) is provided with at least two first tabs (4); the second electrode sheet (2) is provided with at least one second tab (5); the first electrode sheet (1) comprises a first current collector (11) and a first active material layer (12) which coats either side of the first current collector (11); the first active material layer (12) is provided with at least two first empty foil regions (13), and the first tabs (4) are correspondingly arranged in the first empty foil regions (13) and are connected to the first current collector (11); and the first active material layer (12) is provided on the surface of the side of the first current collector (11) facing away from at least one first tab (4). The battery cell in the present application can increase the over-current capacity, thereby facilitating a reduction in temperature rise of the battery and an increase in energy density.
Provided are a battery and an electronic device. The battery comprises a positive electrode sheet, and the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer provided on the surface of the positive electrode current collector; and thermogravimetric analysis is performed on the positive electrode active material layer at a heating rate of 5°C/min in an oxygen atmosphere, and the positive electrode active material layer has at least one weight loss peak between 100°C and 600°C. The problem of voltage attenuation of a battery in a furnace temperature test process can be avoided, the risk of high-temperature intermittent cycling failure of the battery is reduced, and the service life of the battery is prolonged.
The present application provides a battery and an electronic device. A first aspect of the present application provides a battery, comprising an electrolyte, wherein thermogravimetric analysis is carried out on the electrolyte at a heating speed of 5°C/min in a nitrogen atmosphere, and the electrolyte has at least one weight loss peak between 100°C and 600°C. The battery provided by the present application has good thermal stability, and the ARC thermal runaway time of the battery can be effectively prolonged, thereby improving the safety and cycle performance of the battery.
The present application provides an electrolyte and a battery. The X-ray diffraction pattern of the electrolyte of the present application comprises M first diffraction peaks having a 2θ diffraction angle of x and N second diffraction peaks having a 2θ diffraction angle of y, wherein M≥1, N≥1, 10°≤x≤30°, and 30°
Provided in the present disclosure are an electrode sheet and an electrochemical device. The electrode sheet comprises a current collector, wherein in an active material layer on at least one surface of the current collector, the difference between the mass percent of fluorine therein within a first region relative to the total mass of the active material layer in the first region and the mass percent of fluorine in the active material layer within a second region relative to the total mass of the active material layer in the second region is greater than 0, but less than or equal to 3%; the first region is a region between the side surface of the active material layer facing away from the current collector and a first side edge; the second region is a region between the side surface of the active material layer close to the current collector and a second side edge; the distance between the first side edge and the side surface of the active material layer facing away from the current collector is 1-10% of the total thickness of the active material layer; and the distance between the second side edge and the side surface of the active material layer close to the current collector is 1-10% of the total thickness of the active material layer. The electrode sheet provided in the present disclosure can improve the structural strength of the electrode sheet, and reduce the possibility of the electrode sheet cracking or shedding.
Provided in the present application are an electrochemical device and an electrical apparatus. The electrochemical device comprises a first casing, which comprises a recessed part and a flange edge arranged at a circumferential edge of the recessed part; a second casing, which shields an opening of the recessed part and is fixedly connected to the flange edge, the recessed part and the second casing defining an accommodation cavity; and an electrode assembly, which is arranged on the first casing, wherein the flange edge and the second casing are connected via a first structure, and a gap is provided between a first end and a second end of the first structure. The electrochemical device further comprises a second structure, the projection of the second structure in a first direction of the first casing covering the gap. Using the technical solution of the present application can effectively solve the problems in the prior art of complex battery production processes, an electrolyte being prone to overflow during formation processes, and high yields of defective batteries.
An electrolyte and a battery comprising same. The electrolyte comprises an electrolyte salt, a solvent, a fluorovinyl ether compound and a first additive, wherein the first additive comprises at least one of a sulfonic acid additive, an ether nitrile compound and tetraalkenyl silane. The electrolyte can solve the problem of poor high-temperature storage performance.
Embodiments of the present invention provide a housing assembly of button cell, a button cell and an electronic product. The housing assembly of button cell includes: a housing and a conductive part, the housing having a holding cavity that is capable of holding a cell of the button cell, the cell having a first tab and a second tab, the housing being provided with a through hole, the conductive part being positioned at and blocking the through hole, and the conductive part and the through hole being sealed and insulated; where, the number of the conductive part is one or two, and when the number of the conductive part is two, the housing is provided with two through holes, where the conductive parts correspond to the through holes one by one. It is beneficial to improving sealability of the housing assembly of button cell.
Embodiments of the present invention provide a housing assembly of button cell, a button cell and an electronic product. The housing assembly of button cell includes: a housing and a conductive part, the housing having a holding cavity that is capable of holding a cell of the button cell, the cell having a first tab and a second tab, the housing being provided with a through hole, the conductive part being positioned at and blocking the through hole, and the conductive part and the through hole being sealed and insulated; where, the number of the conductive part is one or two, and when the number of the conductive part is two, the housing is provided with two through holes, where the conductive parts correspond to the through holes one by one. It is beneficial to improving sealability of the housing assembly of button cell.
An electrochemical device, which comprises a positive electrode sheet, an isolation layer and a negative electrode sheet, wherein the isolation layer comprises a ceramic layer and a spun layer, and the spun layer is arranged on at least one surface of the ceramic layer; and the spun layer comprises first polymer fibers, the first polymer fibers comprising a zeolite molecular sieve. The water content in the provided electrochemical device is relatively low, such that the high-temperature storage performance and the capacity retention rate of the electrochemical device can be improved.
A battery includes a battery cell, an electrolyte solution, and an aluminum-plastic film. The aluminum-plastic film includes an upper film and a lower film disposed opposite to each other, the upper film and the lower film are connected to form an accommodating cavity, and the battery cell and the electrolyte solution are disposed in the accommodating cavity; and the electrolyte solution includes a non-aqueous organic solvent, an additive, and a lithium salt, where the lithium salt includes lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide. In embodiments of the present disclosure, lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide are used as lithium sources. Lithium bis(fluorosulfonyl)imide does not react with water to generate hydrofluoric acid, which can effectively reduce a content of hydrofluoric acid and slow down aging of a packaging film, thereby prolonging a service life of a battery.
The present application provides a battery cell and a battery. The battery cell comprises a first electrode sheet and a second electrode sheet; the first electrode sheet and the second electrode sheet are sequentially stacked and wound; the end of the first electrode sheet is provided with a single-sided coating area; the single-sided coating area is located in the battery cell; one of the two opposite sides of the battery cell is a deviation correction side; a distance is formed between the side edge of the second electrode sheet and the side edge of the battery cell; and the side edge of the second electrode sheet located on the innermost side of the battery cell is offset towards the deviation correction side relative to the side edge of the second electrode sheet located on the outermost side of the battery cell. The battery cell provided by the present application can improve the energy density of the battery.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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
53.
ELECTRODE SHEET AND PREPARATION METHOD THEREFOR, AND SECONDARY BATTERY
Disclosed are an electrode sheet and a preparation method therefor, and a secondary battery. The electrode sheet comprises: a current collector; a first coating coated on the surface of the current collector, the first coating being sequentially divided into a first region, a second region and a third region in the long axis direction of the electrode sheet; an active material layer coated on the first region; an isolation layer at least partially arranged in the third region in the long axis direction of the electrode sheet; and a covering connection layer arranged in the second region and connected to the active material layer and the isolation layer. In the present application, the isolation layer covers the first coating, so that the surface of the current collector can be completely covered by the coating, there is no risk of short circuit between a positive electrode sheet and a negative electrode sheet, and safety weaknesses of the electrode sheets are reduced; moreover, there is a gap between the active material layer and the first coating, and there is no three-layer overlapping region where the first coating, the active material layer and the isolation layer overlap, so that the situation where a cell has a region with overlarge local thickness is avoided, and the flatness and interface consistency of the cell are ensured.
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
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
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
Disclosed is an electrochemical apparatus. The present disclosure relates to the field of electrochemical energy storage technologies. In the present disclosure, a positive electrode electrolyte solution and a negative electrode electrolyte solution are separated by a solid electrolyte membrane. A high content of a nitrile compound is added to the positive electrode electrolyte solution. A high content of an ether compound is added to the negative electrode electrolyte solution. The nitrile compound may effectively improve stability of a positive electrode interface. The ether compound may effectively improve stability of a negative electrode interface. In this way, a cycle life of an electrochemical apparatus is improved, and in particular, a cycle life of an electrochemical apparatus including metal lithium in a negative electrode is improved.
A positive electrode active material, a positive electrode sheet, and a lithium-ion battery. The positive electrode active material comprises a matrix and a coating layer covering at least part of the surface of the matrix. The matrix comprises a lithium metal oxide, and the lithium metal oxide is a Cmca space group of a cubic crystal system and has a 002 peak with a 2θ of 17.9° to 18.1° and a 131 peak with a 2θ of 67.0° to 67.5°. The coating layer comprises selenium. The positive electrode active material is conducive to improving the specific capacity and cycle performance of a battery.
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 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
Disclosed are a binder and a lithium-ion battery including the binder. The binder includes at least one polymer, and the polymer has a structure shown in Formula 1. The binder utilizes a composite structure in which a main chain is polyethylene glycol and both ends of a polymer chain include catechol, which respectively provide the binder with high ionic conductivity and high adhesion. A negative electrode plate including the binder features relatively has high ionic conductivity and peel strength. In addition, the binder in the present disclosure is used in a lithium-ion battery, and the lithium-ion battery has a higher cycle capacity retention rate, a lower cycle expansion rate, and higher rate performance than a lithium-ion battery using a conventional polymer binder.
Disclosed are a binder and a lithium-ion battery including the binder. The binder includes at least one polymer, and the polymer has a structure shown in Formula 1. The binder utilizes a composite structure in which a main chain is polyethylene glycol and both ends of a polymer chain include catechol, which respectively provide the binder with high ionic conductivity and high adhesion. A negative electrode plate including the binder features relatively has high ionic conductivity and peel strength. In addition, the binder in the present disclosure is used in a lithium-ion battery, and the lithium-ion battery has a higher cycle capacity retention rate, a lower cycle expansion rate, and higher rate performance than a lithium-ion battery using a conventional polymer binder.
A negative electrode sheet and a lithium ion battery. The negative electrode sheet comprises a current collector and an active material layer arranged on at least one side surface of the current collector. Active materials in the active material layer comprise a silicon-carbon material and a carbon-based material. The specific surface area of the silicon-carbon material is denoted as A m2/g, and the specific surface area of the carbon-based material is denoted as B m2/g, wherein A and B satisfy the following relational expression: 1.7 ≤ A/B ≤ 10.5. The lithium ion battery comprising the negative electrode sheet has good thermal abuse performance and a good cycle life, remarkably prolongs the cycle life of normal-temperature circulation and high-temperature circulation, and reduces the deformation rate in a circulation process.
A battery includes a positive electrode plate, a negative electrode plate, a separator, and a non-aqueous electrolyte solution. The non-aqueous electrolyte solution includes a non-aqueous organic solvent including at least ethyl propionate. The separator includes a substrate, a heat-resistant layer, and an adhesive layer, where the heat-resistant layer is disposed on at least one side of the substrate, and the adhesive layer is disposed on the heat-resistant layer. The adhesive layer includes an adhesive including a copolymer of hexafluoropropylene-vinylidene fluoride. A ratio of a mass percentage of ethyl propionate in the non-aqueous electrolyte solution to a mass percentage of hexafluoropropylene in the copolymer of hexafluoropropylene-vinylidene fluoride ranges from 0.2 to 60. The battery in the present disclosure has both a long cycle life and low expansion.
H01M 10/0569 - Liquid materials characterised by the solvents
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 4/133 - Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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 10/0567 - Liquid materials characterised by the additives
H01M 10/0568 - Liquid materials characterised by the solutes
H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
Disclosed is a battery. And the present disclosure pertains to the field of battery technologies. The battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte solution, where the electrolyte solution has a contact angle θ≥60°. In the present disclosure, the contact angle of the electrolyte solution is increased, so that the electrolyte solution of the battery achieves high wettability for the positive electrode plate, the negative electrode plate, and the separator, so as to significantly improve cycling performance and safety performance of the battery.
The present application provides an electrode piece and a battery, wherein the electrode piece provided by the present application includes a first current collector and a first functional layer arranged on at least one surface of the first current collector, the first functional layer includes active material particles, and the surface of the first functional layer is provided with a plurality of first regions and a plurality of second regions distributed alternately with the first regions; an inorganic salt layer is arranged outside part of the active material particles in the first regions. The electrode piece and battery provided by the present application are used for improving initial efficiency and solving the problem of serious expansion of the battery.
Disclosed are a composite separator and an electrochemical apparatus. The composite separator includes a polymer film and a functional coating disposed on at least one surface of the polymer film, where the functional coating contains inorganic particles and organic particles; a particle size D901 of the inorganic particles and a particle size D902 of the organic particles satisfy: 0.01×D902≤D901≤0.5×D902, where D901 and D902 represent particle sizes of inorganic particles and organic particles, respectively, at a cumulative volume of 90% from small particle sizes in the volume-based particle size distribution. The composite separator has excellent thermal shrinkage-resistant performance and interface bonding performance, and can take both cycling performance and high safety of an electrochemical apparatus into account when being used in the electrochemical apparatus.
H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
Provided are a battery and an electronic product. The battery comprises a housing and a jelly roll; the housing accommodates the jelly roll; the housing comprises a deeply recessed surface (19) and a non-deeply recessed surface; the jelly roll comprises a first electrode sheet (1); the first electrode sheet (1) comprises a first current collector (11); the side of the first current collector (11) facing away from the rolling center of the jelly roll is provided with a coated region (12) and an uncoated region (13); the coated region (12) is provided with a first active substance (14), and the uncoated region (13) is not provided with the first active substance (14); the uncoated region (13) is at least partially arranged at the tail rolling end of the jelly roll; the uncoated region (13) is at least partially provided with a protective layer (15); and the protective layer (15) faces the deeply recessed surface (19). If a sharp object pierces into the battery, since the protective layer (15) is added, the distance of the sharp object entering the interior of the electrode sheet is increased; in addition, the protective layer (15) has large hardness and can buffer the instantaneous pressure of the sharp object piercing into the jelly roll, thereby reducing the depth of the sharp object piercing into the jelly roll, reducing the risk of short circuit inside the jelly roll, and improving the safety of the battery, without causing a large change in the size of the battery.
Disclosed are a positive electrode material, and a positive electrode plate and a battery including the positive electrode material. The positive electrode material includes a positive electrode active material and a coating material on a surface of the positive electrode active material; a median particle size Dv50 of the positive electrode material ranges from 2 μm to 7 μm; a chemical formula of the positive electrode active material is LiaFexMn1-x-y-zMyNzPO4, where M and N are co-doping elements, 0.9≤a≤1.1, 0≤x≤1, 0≤y≤0.02, and 0≤z≤0.02; and a median particle size Dv50 of the positive electrode material ranges from 2 μm to 7 μm. Therefore, a battery having a relatively high dynamic performance, low-temperature discharge performance, and safety performance may be obtained.
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/02 - Electrodes composed of, or comprising, active material
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 4/62 - 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
Disclosed are a negative electrode plate and a lithium-ion battery including the negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is disposed on at least one surface of the negative electrode current collector, the negative electrode active material layer includes silicon-based material particles, and the silicon-based material particles include silicon oxide and/or silicon carbide; and the silicon-based material particles meet the following relationship: Di≤35 μm (I), di≤25 μm (II), 0.45≤(ΣEj2)/(ΣDi2)≤0.75 (III), and (ΣFk2)/(ΣDi2)≥0.37 (IV), and a mixing amount of the silicon-based material particles meets the following relationship: 0.05≤(ΣFk2)/S≤0.47 (V). The lithium-ion battery disclosed in the present disclosure has characteristics of high energy density and a long cycle life.
The present disclosure relates to the technical field of batteries, and in particular to an electrolyte solution and a lithium-ion battery. The electrolyte solution comprises an organic solvent, a lithium salt, an additive A, i.e., a trinitride compound, and an additive B, i.e., a polynitrile compound. Under the synergistic effect of the additive A and the additive B, not only can the electrolyte solution be prevented from entering a positive electrode active material layer and corroding the positive electrode active material, but the conductivity of ions in the electrolyte solution can also be improved, such that the battery has excellent high-temperature cycle performance and rate performance.
The present application provides a housing assembly (1) of a battery (100) and a battery (100). The housing assembly (1) comprises: a top cover (11) and a bottom housing (12). The bottom housing (12) and the top cover (11) jointly define a battery cell accommodating cavity (13); the top cover (11) has a first connecting edge (111) surrounding the battery cell accommodating cavity (13), and the bottom housing (12) has a second connecting edge (121) surrounding the battery cell accommodating cavity (13); the first connecting edge (111) is connected to the second connecting edge (121); the top cover (11) and the bottom housing (12) jointly constitute a housing body; the connecting portions of the first connecting edge (111) and the second connecting edge (121) form a connecting sealing edge (16); the housing body comprises a first welding seam (161) located at the end of the connecting sealing edge (16) distant from the battery cell accommodating cavity (13), and an included angle between an outer side surface of the first welding seam (161) and a plane where the first connecting edge (111) and/or the second connecting edge (121) is located is 60°-150°. According to the housing assembly of the battery of the present application, while the structural strength of the housing assembly is ensured, the space occupied by a sealing edge is reduced, thereby improving the energy density of the battery.
Disclosed are a negative electrode active material, and a negative electrode plate and a battery including the negative electrode active material. The negative electrode active material of the present disclosure is a secondary particle having a larger particle size and a higher sphericity degree formed from several particulates having smaller particle sizes and lower sphericity degrees. Isotropy of the negative electrode active material is relatively high, and the particulates in the secondary particle make a migration path of lithium ions relatively short, so that the lithium ions can be intercalated and deintercalated quickly, implementing fast charging performance of the battery.
A packaging film and a battery. The packaging film comprises a first material layer, a second material layer and a third material layer, which are sequentially stacked, wherein the second material layer comprises a first surface and a second surface, which are opposite each other, the first material layer being bonded to the first surface, and the third material layer being bonded to the second surface; the first material layer, the second material layer and the third material layer match one another, and the first material layer, the second material layer and the third material layer are sequentially aligned; the thickness of the first material layer ranges from 5 μm to 100 μm, the thickness of the second material layer ranges from 5 μm to 100 μm, and the thickness of the third material layer ranges from 10 μm to 80 μm; and the first material layer, the second material layer and the third material layer are all high-molecular polymer layers. By means of providing the three different high-molecular polymer layers, the energy density of the battery is increased.
H01M 50/129 - Primary casingsJackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
Provided are an electrode assembly, a battery and a manufacture method thereof. The electrode assembly includes a separator, first and second electrode pieces oppositely disposed on both sides of the separator; the first electrode piece includes a first tab and a first active material layer located on a surface of a side of the first electrode piece and provided with a first tab mounting groove, a reserved area is provided between one side of the first tab mounting groove and an edge of the first active material layer along a first direction; a portion of the first tab is connected within the first tab mounting groove, the first tab covers portion of the reserved area to form a joint; the second electrode piece includes a second active material layer located on a surface of a side of the second electrode piece and provided with a groove opposite to the joint.
Disclosed are a positive electrode material, and a positive electrode plate including the positive electrode material and a battery. The positive electrode material including lithium cobalt oxide with an O3 phase structure and lithium cobalt oxide with an O2 phase structure in the present disclosure has a higher capacity and a significantly improved rate while also having excellent cycling 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 4/02 - Electrodes composed of, or comprising, active material
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
Disclosed are a negative electrode plate and a battery including the negative electrode plate. The negative electrode plate includes a negative electrode current collector, and a first coating region, a second coating region, and a third coating region sequentially disposed along a width direction of the negative electrode current collector. In the present disclosure, a negative electrode plate is designed with a special structure and composition, which solves a problem that lithium deposition easily occurs at the head and bottom during application of a multi-tab winding structure, so that the multi-tab winding structure may be better applied in batteries.
Disclosed in the present application are an electrode sheet and a battery. The electrode sheet comprises a first current collector and a first active coating coated on the surface of the first current collector, wherein a plurality of grooves are provided in the first active coating on at least one side face of the electrode sheet at intervals. With regard to the electrode sheet in the present application, a plurality of grooves are provided in a first active coating of the electrode sheet, such that the migration path of an electrolyte in a negative electrode sheet can be reduced, a lithium plating window is expanded, the risk of lithium plating is reduced, and the utilization rate of the negative electrode sheet is improved; moreover, the potential of the side face of the negative electrode sheet that is close to a diaphragm can be improved, the cycle performance of a battery is improved, the concentration of the electrolyte is uniform, and the utilization rate and energy density of the negative electrode sheet are improved.
An electrolyte solution and a battery comprising the electrolyte solution. The electrolyte solution comprises an electrolyte, a solvent and a first additive. By adding the first additive into the electrolyte solution, the oxidation resistance of the electrolyte solution can be improved; in addition, the first additive can form a film at a positive/negative electrode end, and the formed SEI film contains lithium alkyl sulfonate which can improve the ionic conductivity and stability of the SEI film, effectively inhibit the gas production caused by film decomposition, make components of the electrolyte solution be not prone to be subjected to an oxidative decomposition reaction under a high voltage, and prevent an interface between an electrode and the electrolyte solution from being deteriorated, thereby ensuring the stability of the interface, and facilitating the improvement of the performance of the battery under a high voltage and a high temperature.
Provided in the present disclosure are a separator and a battery comprising same. Polymer microspheres having a melting point ranging from 90℃ to 130℃ are added into a ceramic layer, such that pores in a separator are closed below 130℃, so as to stop the shuttling of lithium ions between positive and negative electrodes inside a battery, thereby achieving the aim of improving the safety. Moreover, the surface of the ceramic layer is coated with a heat-resistant polymer layer, such that it is ensured that the separator is not broken at a high temperature, thereby improving the separation effect of the separator at a high temperature and improving the safety performance of the battery. A negative active substance with a surface being coated with amorphous carbon is further applied, and the negative active substance can significantly improve the quick-charging performance of the battery, such that the prepared battery can achieve both the quick-charging performance and the safety performance.
A positive active material and an application thereof. A peak I and a peak II, either of which have 2θ ranging from 17.8° to 19.5°, are present in an X-ray diffraction pattern of the positive active material. The positive active material is special for improving the capacity, energy density and cycling performance of a battery.
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 4/485 - 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
H01M 4/48 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
A wound battery cell and a battery, relating to the technical field of batteries. A first active coating and a second active coating are respectively arranged on both sides of a current collector of a negative electrode sheet and/or a positive electrode sheet, the first active coating is arranged on the surface of the current collector close to one side of a rolling center, the second active coating is arranged on the surface of the side of the current collector away from the rolling center, and when the diffusion coefficient of the first active coating is smaller than that of the second active coating, the battery capacity during long-term cycle can be effectively kept, so that the problem of the second active coating being prone to lithium precipitation can be effectively solved, and the service life of the battery is prolonged.
Disclosed are a negative electrode plate and a battery including the negative electrode plate. The negative electrode plate includes a current collector, a first active material layer, and a second active material layer, the first active material layer includes a first negative electrode active material, a length-to-diameter ratio of the first negative electrode active material ranges from 3 to 5, and the second active material layer includes a second negative electrode active material with a length-to-diameter ratio ranging from 1 to 2. An effective liquid-phase diffusion channel is constructed for lithium ions by using a combination of negative electrode active materials with different length-to-diameter ratios. This may significantly improve rate performance and energy density of a battery cell, and further resolve a problem of lithium deposition caused by a lower electric potential of the negative electrode plate near a surface of a separator.
Embodiments of the present disclosure relate to the technical field of batteries, and in particular to a battery cell and a battery. The battery cell is formed by winding a first electrode sheet and a second electrode sheet; the first electrode sheet and the second electrode sheet are separated by a separator; a head portion of the second electrode sheet is provided with an empty foil area which is not coated with an active substance; the empty foil area is provided with a first protection adhesive paper and second protection adhesive paper; the first protection adhesive paper and the second protection adhesive paper are located on two sides of an edge of a head portion of the first electrode sheet in a thickness direction of the battery cell.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
A winding battery includes a positive electrode plate and a negative electrode plate which are formed by winding, the positive electrode plate includes a positive electrode current collector and a first coating layer, and the negative electrode plate includes a negative electrode current collector and a negative electrode active layer. The first coating layer includes a first insulating adhesive layer and a positive electrode active layer, the positive electrode active layer is disposed on a surface of the positive electrode current collector, the first insulating adhesive layer is connected to the positive electrode active layer, and at least one cross section of the first insulating adhesive layer and an end surface, close to a winding start point, of the negative electrode active layer are located in a same plane.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
C09J 9/00 - Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 50/531 - Electrode connections inside a battery casing
80.
ELECTRODE PIECE AND PREPARATION METHOD THEREOF, AND BATTERY AND ELECTRIC APPARATUS
An electrode piece, a preparation method thereof, a battery and an electric apparatus are provided. The electrode piece includes a current collector and an active layer arranged on a surface of the current collector; the active layer is provided with a first groove and a second groove, and a groove bottom of the second groove is higher than that of the first groove, and is lower than a surface of the active layer that faces away from the current collector; and the electrode piece has a first side edge and a second side edge that are arranged opposite each other along a first direction, and one side edge of the groove bottom of the second groove is flush with at least one of the first side edge and the second side edge and is located on at least one side of the first groove along the first direction.
A battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte solution. The positive electrode plate includes a positive electrode active material; the negative electrode plate includes a negative electrode active material; the electrolyte solution includes an organic solvent, an additive and an electrolyte salt; the electrolyte salt includes at least one compound represented by Formula 1 and/or at least one compound represented by Formula 2; and the battery satisfies the following requirement: a ratio of (A+B) to C ranges from 10 to 1000.
A battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte solution. The positive electrode plate includes a positive electrode active material; the negative electrode plate includes a negative electrode active material; the electrolyte solution includes an organic solvent, an additive and an electrolyte salt; the electrolyte salt includes at least one compound represented by Formula 1 and/or at least one compound represented by Formula 2; and the battery satisfies the following requirement: a ratio of (A+B) to C ranges from 10 to 1000.
The present application provides a tab and a battery including the tab. The tab includes a metal conductor and an insulation sealing gasket, where the insulation sealing gasket includes a heat-sealing outer layer, an outer transition layer, a core layer, an inner transition layer and a low-softening-point inner layer connected in sequence. The tab of the present application is able to fully guarantee the bonding sealing performance and electrolyte resistance performance of the tab, ensuring the safety performance of the battery. At the same time, it is also able to effectively reduce the heat-sealing temperature and heat-sealing time, shorten the time of packaging, greatly reduce the production energy consumption, and improve the production efficiency. Moreover, it is also able to meet the safe use of the battery under high voltage, large current or direct high temperature conditions.
A negative electrode sheet, including a negative current collector, where a first negative electrode film layer is attached to a surface of the negative current collector, and an active substance of the first negative electrode film layer includes silicon particles and first graphite particles; a second negative electrode film layer is attached to a surface of the first negative electrode film layer, and an active substance of the second negative electrode film layer includes second graphite particles. That is, a negative electrode film layer is divided into two layers, such that when lithium-ions move to the negative electrode sheet, part of lithium-ions are first embedded into the second negative electrode film layer, and the remaining lithium-ions are embedded into the first negative electrode film layer.
The present application discloses a positive electrode and a battery, which can solve safety problems faced by a high-energy-density battery, and prevent the problems that an initial direct-current internal resistance (DCIR) of the battery is too large, an increase change rate of the DCIR is large and a cycle performance deteriorates during cycle process. The present application provides a positive electrode piece, including a positive electrode current collector, a safety layer and an active substance layer, where the safety layer is arranged on a surface of the positive electrode current collector; the active substance layer is arranged on a surface of the safety layer; the safety layer and the active substance layer each contain Co and Al, where a mass ratio of a total amount of Co to a total amount of Al in the safety layer and the active substance layer is (12-85):1.
H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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
A negative electrode sheet, including a negative current collector, where a first negative electrode film layer is attached to a surface of the negative current collector, and an active substance of the first negative electrode film layer includes silicon particles and hard carbon particles; a second negative electrode film layer is attached to a surface of the first negative electrode film layer, and an active substance of the second negative electrode film layer includes graphite particles, such that when lithium-ions move to the negative electrode sheet, part of lithium-ions are first embedded into the second negative electrode film layer, and the remaining lithium-ions are embedded into the first negative electrode film layer.
Provided in the present disclosure are an electrolyte solution and a battery comprising same. The electrolyte solution comprises an electrolyte salt, a carboxylic ester, a carbonic ester, a fluorine-containing solvent A, a fluorine-containing solvent B, a chalcogenide and a polynitrile compound, wherein the fluorine-containing solvent A improves the overall oxidation resistance of the electrolyte solution, and the introduction of the fluorine-containing solvent A solves the problem of poor high-temperature thermal stability of the fluorine-containing solvent B; moreover, the chalcogenide can form a film on a negative electrode and achieves protection on the negative electrode together with the fluorine-containing solvents; the polynitrile compound mainly achieves complexing protection on the surface of a positive electrode; and protection on the positive electrode and the negative electrode is achieved by means of the synergistic effect of these additives, such that the electrolyte solution is prevented from entering a material to cause damage.
The present disclosure provides a battery and an electronic device, which relate to the technical field of batteries and are used for solving the technical problem of poor sealing performance of batteries. The battery includes a shell, a cover assembly and a coiled core assembly located inside the shell; the shell is provided with an opening, and the cover assembly sealingly covers the opening; the cover assembly includes a conductive member, a top cover and a sealing member between the conductive member and the top cover; the conductive member electrically contacts the coiled core assembly; the sealing member is provided with a first through hole, the top cover is provided with a second through hole, and a diameter of the first through hole is smaller than that of the second through hole.
H01M 50/109 - Primary casingsJackets or wrappings characterised by their shape or physical structure of button or coin shape
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
1122+d)≤5, said reaction can be effectively prevented, greatly increasing the stability of the sodium ion, and reducing the phenomenon of gas production.
A charging data determination method, a charging control method, an apparatus, and a device. The charging data determination method comprises: acquiring an Nth set of experimental data of a battery, controlling the charging of the battery according to the Nth set of experimental data and a preset charging capacity, and acquiring Nth parameter information of the battery during charging, wherein N is a positive integer, and the Nth set of experimental data at least includes a plurality of charging rates and a charging duration corresponding to each of the plurality of charging rates; and when it is determined according to the Nth parameter information that no lithium plating occurs on the battery, on the basis of the Nth set of experimental data, determining target charging data of the battery during rate charging, so as to charge the battery according to the target charging data. The method of the present application can improve the charging mechanism of lithium-ion batteries, such that when the charging of a lithium-ion battery is controlled in a charging rate mode, lithium plating of the battery can be avoided.
H01M 10/48 - Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
90.
CHARGING METHOD AND APPARATUS, ELECTRONIC DEVICE, AND READABLE STORAGE MEDIUM
A charging method and apparatus, an electronic device, and a readable storage medium. The charging method comprises: performing constant-current charging on a battery at a first preset current; and adjusting the charging current of the battery on the basis of a duration of continuous charging at the first preset current. Embodiments of the present application can increase the charging current during charging in a high-charging state, and increase the charging speed.
An electrode sheet and a battery, which relate to the technical field of battery energy. The electrode sheet comprises a first electrode sheet body (1), a tab (2) and a first adhesive tape (3), wherein one side of the first electrode sheet body (1) is provided with a first recess (13); the tab (2) is accommodated in the first recess (13), and is connected to a current collector (12) of the first electrode sheet body (1); in the length direction of the first electrode sheet body (1), there is a clearance between the tab (2) and the first recess (13); the first adhesive tape (3) is attached to one side of the first electrode sheet body (1) to block an opening of the first recess (13); and the first adhesive tape (3) is provided with a first protrusion (31) protruding towards the interior the first recess (13), the first protrusion (31) penetrating inside the clearance. After the first adhesive tape (3) is attached to one side of the first electrode sheet body (1), the first protrusion (31) of the first adhesive tape (3) extends into the clearance between the tab (2) and the first recess (13). The first protrusion (31) fills the electrode sheet in the thickness direction of the electrode sheet, such that bending deformation of the electrode sheet opposite the adhesive tape due to formation pressure can be reduced, thereby helping to improve the degree of flatness of the battery.
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
Provided in the present application are a battery cell and an electrochemical device. The battery cell comprises a positive electrode sheet, a negative electrode sheet, and a separator which is arranged between the positive electrode sheet and the negative electrode sheet, wherein the positive electrode sheet, the negative electrode sheet and the separator are wound. The battery cell is provided with a straight area and bent areas located at two ends of the straight area. The positive electrode sheet comprises a positive current collector and a positive active layer which is coated on the positive current collector, wherein the surface of the positive active layer located in each bent area is provided with a recess. Using the technical solution of the present application can effectively solve the problem of a short service life of a lithium-ion battery in the related art.
The present disclosure relates to the field of batteries, and in particular, to a negative electrode material, a negative electrode sheet comprising the negative electrode material, and a battery comprising the negative electrode material. The negative electrode material comprises silicon-carbon particles; the silicon-carbon particles each have a hollow structure; the hollow structure comprises a cavity and a housing surrounding the cavity; the housing comprises a silicon-carbon layer; and the mass content ω of silicon in the silicon-carbon particles and the ratio a of the radius of the cavity to the radius of the silicon-carbon particles satisfy equation (1). The negative electrode material of the present disclosure comprises silicon-carbon particles having a hollow structure, and the mass content of silicon in the silicon-carbon particles and the ratio of the radius of the cavity to the radius of the silicon-carbon particles meet a specific relationship, such that the negative electrode material can effectively relieve the expansion of a silicon material in a battery cycle process, the cycle performance of the battery is improved, and the conductivity of the negative electrode material can be effectively improved.
Provided in the present invention are a power generation apparatus, a battery system, and an electronic device. The power generation device comprises a housing, a power generation assembly, a voltage conversion circuit and an energy storage assembly, wherein a first cavity and a second cavity are provided in the housing, and the voltage conversion circuit and the energy storage assembly are both arranged in the first cavity. The power generation assembly comprises a mass block, a first power generation unit, a second power generation unit and a third power generation unit, wherein the mass block, the first power generation unit and the second power generation unit are all arranged in the second cavity; the shape of the mass block matches the shape of the second cavity, and the mass block freely moves in the second cavity in the extension direction of the housing, or the mass block is driven by an external force to move in the second cavity in the extension direction of the housing; the first power generation unit is configured to generate power by being pressed against by the mass block; the second power generation unit is configured to generate power by means of friction between same and the mass block; and the third power generation unit is configured to generate power by means of electromagnetic induction generated between same and the mass block. The power generation apparatus of the present application extends the duration of usage of an electronic device.
A silicon-containing material, a negative electrode material comprising the silicon-containing material, a negative electrode plate comprising the silicon-containing material, and a battery comprising the silicon-containing material. The silicon-containing material has a core-shell structure, the core of the core-shell structure comprises a silicon-based material, and the shell of the core-shell structure at least comprises elemental F and elemental P. The silicon-containing material has a core-shell structure, and the shell of the silicon-containing material not only is able to better relieve expansion and contraction of the core, but also has good compatibility with an electrolyte, thereby improving the first effect and the energy density of the battery.
The present disclosure relates to the technical field of batteries, and in particular to a negative electrode material, and a negative electrode sheet and a battery comprising the negative electrode material. The negative electrode material has a core-shell structure; a shell comprises a carbon layer; a core comprises porous carbon and silicon particles distributed in pores of the porous carbon; and the negative electrode material has a weight gain peak at a derivative thermogravimetric curve between 400-900°C. The negative electrode material of the present disclosure has high structural stability, and can provide a buffer space for expansion of silicon particles; the negative electrode sheet of the present disclosure prepared from the negative electrode material has high gram volume and high initial Coulombic efficiency; and the battery of the present disclosure prepared from the negative electrode sheet has good rate performance, a high cycle capacity retention rate, and a low expansion rate.
The present disclosure relates to the technical field of batteries, and in particular relates to a negative electrode material and a preparation method therefor, and a negative electrode sheet and a battery which comprise the negative electrode material. The negative electrode material has a core-shell structure, wherein a shell layer comprises a carbon layer, and a core comprises porous carbon and silicon particles that are distributed in outer pores of the porous carbon, the porous carbon also containing inner pores. The negative electrode material contains a metal element. The negative electrode material of the present disclosure can provide a buffer space when the silicon particles are subjected to lithium intercalation volume expansion, and the stability between the negative electrode material and an electrolyte interface is high. The negative electrode sheet comprising the negative electrode material of the present disclosure has the characteristics of both high gram volume and high initial coulombic efficiency. The battery comprising the negative electrode sheet of the present disclosure has a high energy density, high cycling stability, good rate capability and a low volume expansion rate.
A pole piece, a preparation method for a pole piece, and a battery, the pole piece comprising a current collector, and a surface of the current collector comprising a first area, a second area, and a third area which are sequentially adjacent. The first area is provided with a first safety coating and a first active layer which are stacked, and the first active layer is located on the surface of the first safety coating away from the current collector. The second area is provided with a second safety coating and a second active layer which are stacked, and the second active layer is located on the surface of the second safety coating away from the current collector. The third area is used for arranging a tab. In the direction from the current collector to the second active layer, the thickness of the second safety coating gradually decreases in the direction close to the third area. In the pole piece provided by an embodiment, the problem of wrinkling and bulging of edges of the coatings after the pole piece coated with the safety coatings is wound and unwound during the manufacturing process is solved.
A lithium ion battery, comprising an electrolyte, a positive electrode sheet containing a positive active material, a negative electrode sheet containing a negative active material, and an isolation film. The electrolyte comprises electrolyte salt, an organic solvent, and an additive A, and the mass percentage content of the additive A in the electrolyte is Z%. The positive active material is doped with at least one among Al, Co, Mg, and Ti, Al accounts for X% of the total mass of the positive active material, Co accounts for Y% of the total mass of the positive active material, Mg accounts for W% of the total mass of the positive active material, and Ti accounts for P% of the total mass of the positive active material. The relationship between Z, X, Y, W, and P satisfies 0.008≤Z/(X+W+P+Y)≤0.15. The specific surface area of the positive active material is B m2/g, and the relationship between Z and B satisfies 0.5≤Z/B≤22.
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
The present disclosure relates to the field of batteries, and in particular to a battery. The charging expansion curve of the battery comprises a first stage, a second stage and a third stage, the inflection point from the first stage to the second stage is A1, and the inflection point from the second stage to the third stage is A2; the expansion rate of the battery in the first stage is Δa, the expansion rate of the battery in the third stage is Δb, and Δa and Δb satisfy 1.1≤Δb/Δa≤1.5. According to the battery of the present disclosure, the cycle performance of the battery can be improved, and the deformation rate of the battery after multiple cycles is reduced.
