A porous carbon material having a sphericity of a, where 0.7≤a≤0.97; the porous carbon material includes potassium element; and based on a mass of the porous carbon material, a mass proportion of the potassium element is b ppm, where 1≤b≤2998.
A secondary battery includes an electrode assembly which includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer includes a positive electrode active material. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer includes a negative electrode active material. The positive electrode current collector as a whole extends to form a plurality of positive electrode tabs, and the negative electrode current collector as a whole extends to form a plurality of negative electrode tabs. A coating weight of the positive electrode active material layer is Wz, a coating weight of the negative electrode active material layer is Wf, and Wz and Wf satisfy: 1.6Wf≤Wz≤2.2Wf, and 3.25 mg/cm2≤Wf≤5.84 mg/cm2.
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/587 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 50/538 - Connexions de plusieurs conducteurs ou languettes d’électrodes empilées enroulées ou pliées
A secondary battery includes a negative electrode plate and an electrolyte, where a negative electrode active material in the negative electrode plate has a crystal plane spacing of d002 nm and a crystal plane stacking thickness of Lc (nm), 10×d002/Lc<0.109, and the electrolyte includes fluoroethylene carbonate and lithium difluorophosphate, where based on a mass of the electrolyte, a mass percentage of fluoroethylene carbonate is S1% and a mass percentage of lithium difluorophosphate is S2%, 1.5≤S1≤5.0, and S1≥4×d002+0.8×S2. The secondary battery exhibits good low-temperature discharge rate performance.
H01M 10/0569 - Matériaux liquides caracterisés par les solvants
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/587 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0568 - Matériaux liquides caracterisés par les solutés
A secondary battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte, where the positive electrode sheet includes a positive electrode active material layer. The negative electrode sheet includes a negative electrode active material layer. A coating weight of the positive electrode active material layer is Wz, a coating weight of the negative electrode active material layer is Wf, and Wz and Wf satisfy: 1.6Wf≤Wz≤2.2Wf, and 3.25 mg/cm2≤Wf≤5.84 mg/cm2. The separator includes a separator substrate, a first adhesive coating, and a second adhesive coating, where the first adhesive coating and the second adhesive coating are respectively provided on two sides of the separator substrate. The electrolyte includes chain carboxylate. Based on a mass of the electrolyte, a mass percentage of the chain carboxylate is 6% to 56%.
H01M 10/056 - Accumulateurs à électrolyte non aqueux caractérisés par les matériaux utilisés comme électrolytes, p. ex. électrolytes mixtes inorganiques/organiques
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0568 - Matériaux liquides caracterisés par les solutés
H01M 10/0569 - Matériaux liquides caracterisés par les solvants
H01M 50/457 - Séparateurs, membranes ou diaphragmes caractérisés par le matériau ayant une structure en couches comprenant au moins trois couches
H01M 50/46 - Séparateurs, membranes ou diaphragmes caractérisés par leur combinaison avec des électrodes
H01M 50/489 - Séparateurs, membranes, diaphragmes ou éléments d’espacement dans les cellules caractérisés par leurs propriétés physiques, p. ex. degré de gonflement, hydrophilicité ou propriétés pour court-circuiter
A battery cell includes an electrode plate group and a separator. The electrode plate group includes a positive electrode plate and a negative electrode plate stacked along a first direction. The separator is configured to separate the positive electrode plate from the negative electrode plate. The separator includes a first termination section and a second termination section, where the first termination section is located on one side of the electrode plate group along the first direction, the second termination section is located on one side of the electrode plate group along a second direction, and the first direction is perpendicular to the second direction.
H01M 50/466 - Séparateurs, membranes ou diaphragmes caractérisés par leur forme en forme de U, de sac ou pliés
H01M 10/0583 - Structure ou fabrication d'accumulateurs à éléments de structure pliés à l'exception des éléments enroulés, c.-à-d. des électrodes positives ou négatives pliées ou des séparateurs pliés, p. ex. à électrodes ou séparateurs en forme de Z
H01M 50/451 - Séparateurs, membranes ou diaphragmes caractérisés par le matériau ayant une structure en couches comprenant des couches de matériau organique uniquement et des couches comprenant un matériau inorganique
H01M 50/46 - Séparateurs, membranes ou diaphragmes caractérisés par leur combinaison avec des électrodes
The present invention belongs to the technical field of battery materials, and provides a positive electrode material, a secondary battery, and an electronic device. The positive electrode material comprises a cobalt-containing material, which has, within a range from 0 nm to 100 nm on the surface thereof, a bimodal feature of fluorine element detected by X-ray photoelectron spectroscopy (XPS), wherein the peak of the first peak is in the range of 687eV to 688eV, corresponding to a high-binding-energy fluoride, and the peak of the second peak is in the range of 684eV to 686eV, corresponding to a low-binding-energy fluoride. In the present application, by introducing fluorine elements having different binding energies into the cobalt-containing material and adjusting the relative content of the two fluorides, the high-temperature storage performance and safety performance of the secondary battery can be improved when such material is used in a secondary battery.
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/58 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de composés inorganiques autres que les oxydes ou les hydroxydes, p. ex. sulfures, séléniures, tellurures, halogénures ou LiCoFyEmploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de structures polyanioniques, p. ex. phosphates, silicates ou borates
7.
POSITIVE ELECTRODE MATERIAL, SECONDARY BATTERY, AND ELECTRONIC DEVICE
Disclosed in the present application are a positive electrode material, a secondary battery, and an electronic device. The positive electrode material comprises a core and a carbon coating layer, wherein the carbon coating layer covers at least a part of the surface of the core; the core comprises a lithium phosphate salt, and the lithium phosphate salt comprises a first element and a second element; the first element comprises at least one of an iron element, a manganese element, a cobalt element, or a nickel element, and on the basis of the mass of the positive electrode material, the mass content of the first element is m%, 32.5≤m≤37.5; the second element comprises at least one of a magnesium element, a titanium element, or a copper element, and on the basis of the mass of the positive electrode material, the mass content of the second element is n%, 0.01≤n≤1; the carbon coating layer comprises a nitrogen element, and on the basis of the mass of the positive electrode material, the mass content of the nitrogen element is A%, 0.2≤A≤5. The secondary battery provided by the present application has good electrochemical performance, especially high discharge gram capacity and low-temperature rate discharge performance.
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/58 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de composés inorganiques autres que les oxydes ou les hydroxydes, p. ex. sulfures, séléniures, tellurures, halogénures ou LiCoFyEmploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de structures polyanioniques, p. ex. phosphates, silicates ou borates
Provided in the present application are a battery cell and an electrical device. The battery cell comprises an electrode assembly. The electrode assembly comprises a first electrode sheet group and a second electrode sheet group which are stacked in a first direction, a first electrode sheet connecting part and a second electrode sheet connecting part, the size of the first electrode sheet group in a second direction being greater than the size of the second electrode sheet group in the second direction. The first electrode sheet group comprises a first positive electrode sheet and a first negative electrode sheet. The second electrode sheet group comprises a second positive electrode sheet and a second negative electrode sheet. A first positive electrode current collector of the first positive electrode sheet, the first electrode sheet connecting part, and a second positive electrode current collector of the second positive electrode sheet are integrally formed. A first negative electrode current collector of the first negative electrode sheet, the second electrode sheet connecting part, and a second negative electrode current collector of the second negative electrode sheet are integrally formed. A positive electrode tab and a negative electrode tab in the electrode assembly can be arranged at any position, such that the range of application of the battery cell is wider, and the relative position between the first electrode sheet group and the second electrode sheet group can be more stable.
A secondary battery and an electric device. The secondary battery comprises a housing, an electrode assembly, a first tab bundle, a first adapter tab, and a first bonding member. The first tab bundle is accommodated in the housing, the first tab bundle is bent into a U shape, and the first tab bundle comprises a first portion, a second portion, and a third portion which are arranged in sequence. The first adapter tab comprises a first connecting portion and a second connecting portion, the first connecting portion is connected to the first tab bundle, and the second connecting portion is connected to the first connecting portion. The second connecting portion has a first surface. A first adhesive layer is arranged on the first surface, the first adhesive layer extends in the direction in which the second connecting portion extends out of the housing, the first adhesive layer comprises a connecting portion and an extending portion which are arranged in sequence, and the connecting portion bonds the housing and the first adapter tab. The first bonding member bonds the extending portion and the electrode assembly. The secondary battery is beneficial to reducing the possibility of tearing of the first tab bundle.
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 50/538 - Connexions de plusieurs conducteurs ou languettes d’électrodes empilées enroulées ou pliées
H01M 50/54 - Connexion de plusieurs conducteurs ou languettes d’électrodes empilées en forme de plaque, p. ex. barrettes ou ponts de pôles d’électrode
H01M 50/474 - Éléments d'espacement à l'intérieur des cellules autres que les séparateurs, les membranes ou les diaphragmesLeurs procédés de fabrication caractérisés par leur position dans les cellules
H01M 50/477 - Éléments d'espacement à l'intérieur des cellules autres que les séparateurs, les membranes ou les diaphragmesLeurs procédés de fabrication caractérisés par leur forme
The present application relates to the technical field of batteries, and discloses a secondary battery and an electronic device. The secondary battery comprises a case, an electrode assembly, and a conductive terminal. A first electrode sheet of the electrode assembly comprises a first sub-electrode sheet, the first sub-electrode sheet is located at the outermost side in the thickness direction of the electrode assembly, the surface of the first sub-electrode sheet away from a second electrode sheet is provided with an empty foil region, and the empty foil region is electrically connected to the case. The conductive terminal is insulatedly arranged on the case, and the second electrode sheet of the electrode assembly comprises a tab electrically connected to the conductive terminal. The first electrode sheet comprises a first main body portion and a first extension portion, and the projection of the first extension portion in the thickness direction does not coincide with the tab and the conductive terminal. In the secondary battery, the empty foil region is provided on the surface of the first electrode sheet, and the empty foil region is in contact with the case to form an electrical connection, thereby improving the stability of the connection between the first electrode sheet and the case and reducing the number of conductive terminals. The first electrode sheet is further provided with the first extension portion to increase a coating space of an active material layer, thereby improving the energy density of the secondary battery.
H01M 50/176 - Dispositions pour introduire des connecteurs électriques dans ou à travers des boîtiers adaptées à la forme des cellules pour des cellules prismatiques ou rectangulaires
H01M 50/528 - Connexions électriques fixes, c.-à-d. non prévues pour être déconnectées
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
The present application provides a battery cell and an electric device. The battery cell comprises an electrode assembly, a first casing, and a second casing. The electrode assembly comprises a first electrode sheet group and a second electrode sheet group that are stacked in a first direction, and in a second direction, the length of the first electrode sheet group is greater than that of the second electrode sheet group. In the first direction, the surface of the first casing facing the second casing is provided with a first accommodating cavity configured to accommodate the first electrode sheet group, and the surface of the second casing facing the first casing is provided with a second accommodating cavity configured to accommodate the second electrode sheet group. In the present solution, the first accommodating cavity and the second accommodating cavity both have small depths, low processing difficulty, and higher matching degree with the contour of the electrode assembly, reducing the risk of the electrode assembly shaking in spaces formed by the first accommodating cavity and the second accommodating cavity or reducing the degree of shaking, mitigating a drop failure problem, and reducing space waste of the first accommodating cavity and the second accommodating cavity, thereby facilitating improvement of the energy density of the battery cell.
H01M 10/0585 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure plats, c.-à-d. des électrodes positives plates, des électrodes négatives plates et des séparateurs plats
12.
POSITIVE ELECTRODE MATERIAL, ELECTROCHEMICAL APPARATUS, AND ELECTRONIC DEVICE
The present application provides a positive electrode material. When a button cell fabricated with the positive electrode material versus a lithium metal sheet is charged and discharged at a rate of 0.04 C within a voltage range of 2.8 V to 4.5 V, the resulting differential capacity vs. voltage curve shows a first oxidation peak and a first reduction peak within the range of 3.6 V to 4.0 V, a second oxidation peak and a second reduction peak within the range of 4.1 V to 4.3 V, and a third oxidation peak and a third reduction peak within the range of 4.31 V to 4.5 V. The positive electrode material of the present application exhibits higher energy density and better cycling stability.
The present application discloses a battery and an electronic device. In a packaging case, each second side section and a corresponding third side section of a top wall form a stepped structure; a sealing portion comprises a top seal, side seals, and folded edge portions; the top seal and a first side section are stacked in a first direction; each side seal and a corresponding side wall are stacked in a second direction; each stepped structure provides an accommodating space for the corresponding folded edge portion connected to the top seal and the corresponding side seal, so that the folded edge portion can be fixed in a folded state on a packaging main body; in the first direction, the projection of each folded edge portion at least partially overlaps the projection of the corresponding third side section, tabs each at least partially extend out of the top seal in the first direction, and in the first direction, each folded edge portion does not exceed the edge of the corresponding tab.
Disclosed in the present application are a positive electrode material, a secondary battery and an electronic apparatus. The positive electrode material comprises an inner core and a carbon coating layer, the carbon coating layer coating at least part of the surface of the inner core. The inner core comprises a lithium phosphate salt, and the lithium phosphate salt comprises a first element and a second element; the first element comprises at least one of iron, manganese, cobalt or nickel; on the basis of the mass of the positive electrode material, the mass content of the first element is m%, where 32.5≤m≤37.5; the second element comprises at least one of chromium, yttrium or tungsten; on the basis of the mass of the positive electrode material, the mass content of the second element is n%, where 0.01≤n≤1. The carbon coating layer comprises carbon; on the basis of the mass of the positive electrode material, the mass content of carbon is A%, where 0.8≤A≤3. The secondary battery provided in the present application has better electrochemical performance, especially better discharge specific capacity and better low-temperature performance.
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/58 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de composés inorganiques autres que les oxydes ou les hydroxydes, p. ex. sulfures, séléniures, tellurures, halogénures ou LiCoFyEmploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de structures polyanioniques, p. ex. phosphates, silicates ou borates
15.
SECONDARY BATTERY, ELECTRIC DEVICE, AND PREPARATION METHOD FOR SECONDARY BATTERY
The present application discloses a secondary battery, an electric device, and a preparation method for the secondary battery. The secondary battery comprises a housing, an electrode assembly, and a support layer. The housing is a metal housing and comprises a first housing and a second housing. The first housing comprises a bottom wall and a side wall connected to the periphery of the bottom wall. The second housing covers a recess formed by the side wall and the bottom wall, and part of the second housing is connected to the side wall. The electrode assembly is disposed in the recess. At least part of the support layer is disposed between the second housing and the outermost electrode sheet of the electrode assembly. When viewed in a first direction, the support layer overlap at least part of the edge of the outermost electrode sheet. The material of the support layer includes at least one of polycarbonate, polyamide, polyoxymethylene and polybutylene terephthalate, or the support layer is insulating adhesive paper. In the hot-press formation process of the secondary battery, the support layer can support the second housing to a certain extent, so as to reduce the pressure of the middle of the second housing on the electrode assembly, thereby facilitating the reduction of the degree of outward protrusion of the bottom wall.
The present application relates to the technical field of batteries, and discloses a secondary battery and an electronic device. A housing of the secondary battery comprises an accommodating cavity and a first side wall, and the first side wall is provided with a first through hole. A pressure relief assembly is disposed on the first side wall and covers the first through hole; the pressure relief assembly comprises a metal deformable member and a sealing member; the metal deformable member comprises an active deformable layer, a polymer layer, and a passive deformable layer; the polymer layer is separately connected to the active deformable layer and the passive deformable layer; the sealing member is connected to the active deformable layer and the first side wall, or the sealing member is connected to the passive deformable layer and the first side wall; and the coefficient of thermal expansion of the active deformable layer is greater than that of the passive deformable layer. By providing the metal deformable member as the pressure relief structure, the secondary battery can improve pressure relief efficiency; in addition, the polymer layer isolates the active deformable layer from the passive deformable layer, so that the probability of electrochemical corrosion caused by direct contact between the active deformable layer and the passive deformable layer can be reduced, helping to relieve stress, and ensuring stable deformation performance and reset performance of the active deformable layer and the passive deformable layer.
The present application provides a positive electrode sheet, a secondary battery, and an electronic device. The positive electrode sheet comprises a positive electrode material layer; the positive electrode material layer comprises a positive electrode active material and an additive; the additive comprises at least one of barium titanate, magnesium metatitanate, and strontium titanate; the dielectric constant E1 of the positive electrode sheet is 5-30. The positive electrode material layer of the positive electrode sheet comprises the additive, thereby improving the low-temperature discharging performance of a secondary battery, and causing the secondary battery to have high rate performance.
H01M 4/13 - Électrodes pour accumulateurs à électrolyte non aqueux, p. ex. pour accumulateurs au lithiumLeurs procédés de fabrication
H01M 4/62 - Emploi de substances spécifiées inactives comme ingrédients pour les masses actives, p. ex. liants, charges
H01M 10/42 - Procédés ou dispositions pour assurer le fonctionnement ou l'entretien des éléments secondaires ou des demi-éléments secondaires
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
Disclosed in the present application are a cylindrical battery and an electronic device. The cylindrical battery comprises a housing and an electrode assembly arranged in the housing. The electrode assembly comprises a positive electrode sheet, a separator, and a negative electrode sheet that are stacked and wound. In the thickness direction of the negative electrode sheet, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer stacked on the negative electrode current collector. In the thickness direction of the positive electrode sheet, the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer stacked on the positive electrode current collector. The negative electrode active material layer comprises a negative electrode active material, and the negative electrode active material comprises silicon. The positive electrode current collector comprises a first bare foil section on which no positive electrode active material layer is arranged, and the first bare foil section extends beyond the negative electrode sheet in the direction opposite to the winding direction of the electrode assembly. The innermost turn of the electrode sheet of the electrode assembly is the first bare foil section, the first bare foil section being wound for at least one turn in the winding direction of the electrode assembly. Thus, the risk of sliding and collapse of the inner turns of the electrode sheet can be reduced, thereby improving the safety performance of the cylindrical battery.
The present application relates to the technical field of battery materials, and provides a positive electrode material, a secondary battery, and an electronic device. The positive electrode material comprises cobalt-containing particles. The cobalt-containing particles are determined by X‑ray photoelectron spectroscopy, and contain lanthanum within a range of 0-100 nm from the surface. An La3d spectrum comprises a first peak and a second peak; the peak value of the first peak ranges from 843 eV to 837 eV; and the peak value of the second peak ranges from 830 eV to 835 eV. The present application improves the electrochemical performance of positive electrode materials and secondary batteries in high-temperature and low-temperature environments.
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/52 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer
H01M 4/13 - Électrodes pour accumulateurs à électrolyte non aqueux, p. ex. pour accumulateurs au lithiumLeurs procédés de fabrication
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
A secondary battery includes a positive electrode sheet, a negative electrode sheet, and an electrolyte. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The positive electrode current collector integrally extends to form multiple positive electrode tabs. The negative electrode current collector integrally extends to form multiple negative electrode tabs. The positive electrode active material layer includes a positive electrode active material, and Dv99 of the positive electrode active material is 27 μm to 33 μm. The negative electrode sheet includes the negative electrode active material layer, the negative electrode active material layer includes a negative electrode active material, and Dv99 of the negative electrode active material is 23 μm to 28 μm. The electrolyte includes an organic solvent, a lithium salt, and an additive.
H01M 10/056 - Accumulateurs à électrolyte non aqueux caractérisés par les matériaux utilisés comme électrolytes, p. ex. électrolytes mixtes inorganiques/organiques
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/38 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'éléments simples ou d'alliages
H01M 4/485 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques d'oxydes ou d'hydroxydes mixtes pour insérer ou intercaler des métaux légers, p. ex. LiTi2O4 ou LiTi2OxFy
H01M 4/505 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de manganèse d'oxydes ou d'hydroxydes mixtes contenant du manganèse pour insérer ou intercaler des métaux légers, p. ex. LiMn2O4 ou LiMn2OxFy
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/58 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de composés inorganiques autres que les oxydes ou les hydroxydes, p. ex. sulfures, séléniures, tellurures, halogénures ou LiCoFyEmploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de structures polyanioniques, p. ex. phosphates, silicates ou borates
H01M 4/583 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0568 - Matériaux liquides caracterisés par les solutés
H01M 10/0569 - Matériaux liquides caracterisés par les solvants
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
H01M 50/538 - Connexions de plusieurs conducteurs ou languettes d’électrodes empilées enroulées ou pliées
A secondary battery includes a positive electrode sheet including a positive electrode active material, and a negative electrode sheet including a negative electrode active material, where Dv99 of the positive electrode active material is 27 μm to 33 μm, and Dv99 of the negative electrode active material is 23 μm to 28 μm; a separator includes a separator substrate, a first adhesive coating and a second adhesive coating, where the first adhesive coating and the second adhesive coating are respectively provided on two sides of the separator substrate, the first adhesive coating includes a first polymer binder, an average particle size of the first polymer binder is 0.3 μm to 3 μm, the second adhesive coating includes a second polymer binder, and an average particle size of the second polymer binder is 10 μm to 38 μm; and an electrolyte includes an organic solvent, a lithium salt, and an additive.
A secondary battery includes a positive electrode plate, a negative electrode plate, and a separator, where the positive electrode plate includes a positive electrode active material layer, the positive electrode active material layer including a positive electrode active material; and the negative electrode plate includes a negative electrode active material layer, the negative electrode active material layer including a negative electrode active material. A coating weight of the positive electrode active material layer is Wz, and a coating weight of the negative electrode active material layer is Wf, satisfying: 1.6Wf≤Wz≤2.2Wf, and 3.25 mg/cm2≤Wf≤5.84 mg/cm2. Dv99 of the positive electrode active material is 27 μm to 33 μm, and Dv99 of the negative electrode active material is 23 μm to 28 μm. The separator includes a separator substrate, a first adhesive coating, and a second adhesive coating.
12122. The positive electrode material of the present application has good conductivity, interface stability and structural stability, and can improve the cycle stability, thermal stability and other properties of a secondary battery when used in the secondary battery.
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
25.
POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE SHEET, AND SECONDARY BATTERY
12122. When the positive electrode material or the positive electrode sheet of the present application is used in a secondary battery, the cycle performance and high-rate performance of the secondary battery can be improved.
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
Disclosed in the present application are a secondary battery and an electronic apparatus. The secondary battery comprises a positive electrode sheet, the positive electrode sheet comprising a positive electrode current collector and a positive electrode mixture layer, which is disposed on at least one surface of the positive electrode current collector, wherein the positive electrode mixture layer comprises a first material and conductive carbon; the first material comprises at least two of nickel, cobalt or manganese; and the conductive carbon contains a carbon nanotube, the diameter of the carbon nanotube is D nm, 1.4≤D≤20, the length of the carbon nanotube is L μm, and 0.07≤L≤7. A differential capacity versus voltage (dQ/dV-V) curve of the secondary battery during discharge comprises a characteristic peak, wherein a peak position of the characteristic peak ranges from 4.1 V to 4.3 V. The secondary battery provided in the present application has relatively good high-temperature cycle performance and low-temperature discharge performance.
An electrochemical device and a preparation method therefor, and an electronic device. The electrochemical device comprises a packaging pouch, an electrode assembly, and an electrically conductive plate, wherein the electrode assembly is disposed in the packaging pouch, and the electrically conductive plate is electrically connected to the electrode assembly. The packaging pouch comprises an accommodating portion for accommodating the electrode assembly and a sealing portion connected to the accommodating portion, the electrically conductive plate extending out of the packaging pouch from the sealing portion. A first direction is the thickness direction of the electrode assembly, and a second direction is perpendicular to the first direction and is a direction pointing from the electrode assembly to the electrically conductive plate. The accommodating portion comprises a first wall and a second wall, which are arranged opposite each other in the second direction. The accommodating portion further comprises a reinforcing portion. The reinforcing portion comprises at least one first protruding portion integrally disposed on the first wall. The first wall comprises a first surface and a second surface, which are arranged opposite each other in the second direction, and the first protruding portion forms a first protrusion on the first surface and forms a first recess on the second surface. The present application can ameliorate the deformation problem of the packaging pouch.
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
28.
BATTERY ELECTRODE SHEET AND PREPARATION METHOD THEREFOR, AND BATTERY
The present application discloses a battery electrode sheet. The electrode sheet comprises a current collector; an active material layer is provided on at least one surface of the current collector; the active material layer comprises active material particles and a binder; grooves are formed on the active material layer; the depth of the grooves and the amount of the binder in the active material layer of the electrode sheet satisfy the following relationship: D≤δ×B, wherein D is the depth of the grooves, δ is a depth coefficient, and B% is the mass percentage of the binder in the active material layer of the electrode sheet; when the electrode sheet is a negative electrode sheet, δ=20; and/or, when the electrode sheet is a positive electrode sheet, δ=15. The present application further provides a preparation method for the electrode sheet and a battery. The electrode sheet of the present application increases electrolyte infiltration in a thin separator system, increases the amount of electrolyte in the middle of a battery cell during cycling, and within the ranges of parameters of the present application, can avoid safety risks and improve infiltration performance.
H01M 4/13 - Électrodes pour accumulateurs à électrolyte non aqueux, p. ex. pour accumulateurs au lithiumLeurs procédés de fabrication
H01M 4/62 - Emploi de substances spécifiées inactives comme ingrédients pour les masses actives, p. ex. liants, charges
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
A secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a positive electrode current collector, an undercoating layer, and a positive electrode active material layer, where the undercoating layer is disposed between the positive electrode current collector and the positive electrode active material layer. The undercoating layer includes an inorganic metal oxide, where element M in the inorganic metal oxide includes at least one of Al, Ti, Sn, Sb, or Mg, and a mass percentage W1 of the inorganic metal oxide is from 55% to 99%. A first compound in the electrolyte includes at least one of fluorinated ethylene carbonate, difluorinated ethylene carbonate, or a compound represented by formula (I), formula (II), or formula (III), with a mass percentage of the first compound being a %, where 0.15≤a≤21.
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/133 - Électrodes à base de matériau carboné, p. ex. composés d'intercalation du graphite ou CFx
H01M 4/134 - Électrodes à base de métaux, de Si ou d'alliages
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/38 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'éléments simples ou d'alliages
H01M 4/583 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
111≤0.5. By means of the described configurations, the adhesion between the separator and electrode sheets can be improved, thereby mitigating deformation of the secondary battery.
The present application discloses a positive electrode material, an electrochemical apparatus, and an electronic apparatus. The positive electrode material comprises lithium cobalt oxide particles, wherein the lithium cobalt oxide particles have an R-3m structure and a Cmca structure, and the lithium cobalt oxide particles comprise a phosphorus element and an oxygen element. The electrochemical apparatus of the present application has good room-temperature cycling performance, kinetic performance, and charge-discharge specific capacity.
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
32.
POSITIVE ELECTRODE MATERIAL, ELECTROCHEMICAL DEVICE, AND ELECTRONIC DEVICE
33mc structure and a Cmca structure, and the lithium cobalt oxide particles comprise yttrium, oxygen, and fluorine. The electrochemical device of the present application has good high-temperature (45°C and above) cycle performance, kinetic performance (charging-discharging rate) and charging-discharging specific capacity.
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
33.
POSITIVE ELECTRODE MATERIAL, ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE
33mc structure and a Cmca structure, and comprise titanium and aluminum; and on the basis of the molar content of metal elements other than lithium in the lithium cobalt oxide particles being 100%, the molar content of titanium is a%, and the molar content of aluminum is b%, where 0.1≤a/b≤30, and 0.3≤a+b≤5. In the present application, the addition of titanium and aluminum to the lithium cobalt oxide particles is beneficial for improving the overall stability of the positive electrode material, so that the electrochemical device has good room-temperature cycle performance and high-temperature safety performance.
Disclosed in the present application are a secondary battery, an electrical device and a manufacturing method for the secondary battery. The secondary battery comprises an electrode assembly, a first tab bundle and a first adapter tab. The first tab bundle comprises a plurality of first tabs, each of the first tabs is electrically connected to the electrode assembly. The first tab bundle comprises a first portion, a bent portion and a second portion which are successively connected, the first portion being connected to the electrode assembly, and the bent portion connecting the first portion and the second portion. The first adapter tab comprises a first connection portion and a second connection portion; the first connection portion comprises a first surface and a second surface, the first surface facing the electrode assembly, and the first surface being connected to the second portion; the second connection portion is connected to the first connection portion, and the second connection portion and the second surface are located on the same side of the first connection portion. In the secondary battery, the first adapter tab can be as close to the bent portion of the first tab bundle as possible in the thickness direction of the electrode assembly, which is beneficial to reducing the space occupied by the first tab bundle and the first adapter tab in the thickness direction of the electrode assembly.
Provided in the present application are a negative electrode active material, a secondary battery and an electronic apparatus. The hardness of the negative electrode active material is Cs Mpa, where 30.0≥Cs≥15.0, and the crushing pressure of the negative electrode active material is F mN, where F≥2.0. The negative electrode active material provided in the present application can improve the cycle performance of secondary batteries.
H01M 4/587 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
A secondary battery, comprising an electrode assembly. The electrode assembly comprises first electrode sheets, separators and second electrode sheets which are sequentially stacked in a first direction. The first electrode sheets comprise a first double-sided electrode sheet located between two adjacent second electrode sheets, wherein the first double-sided electrode sheet comprises a first metal foil and first active layers arranged on two surfaces of the first metal foil in the first direction. The first electrode sheets further comprise first single-sided electrode sheets, wherein the outermost electrode sheets of the electrode assembly in the first direction are the first single-sided electrode sheets; each first single-sided electrode sheet comprises a first current collector and a second active layer; the second active layer is arranged on the surface of the first current collector that faces the second electrode sheets; the first current collector comprises a first polymer layer and a second metal layer which are stacked in the first direction; the resistance per unit area of 1 cm211, and the resistance per unit area of 1 cm22122≤15 mΩ. By means of the secondary battery and electronic device in the present application, the problem of capacity loss of the secondary battery can be ameliorated.
H01M 10/0585 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure plats, c.-à-d. des électrodes positives plates, des électrodes négatives plates et des séparateurs plats
A secondary battery and an electronic apparatus. The secondary battery comprises a packaging bag, an electrode assembly, and tabs. The electrode assembly comprises first electrode sheets and second electrode sheets having opposite polarities, and separators. The plurality of first electrode sheets, the separators, and the plurality of second electrode sheets are alternately stacked in a first direction, wherein the first direction is the thickness direction of the electrode assembly. Viewed in the first direction, the electrode assembly has a first corner position, a second corner position, a third corner position, and a fourth corner position. A first notch portion is provided at the first corner position, a second notch portion is provided at the second corner position, a third notch portion is provided at the third corner position, and a fourth notch portion is provided at the fourth corner position. Four tabs are provided, and the four tabs are arranged in one-to-one correspondence with the first notch portion, the second notch portion, the third notch portion, and the fourth notch portion. One end of each tab is connected to the corresponding electrode sheet, and the other end of the tab extends out of the packaging bag from the corresponding notch portion in a second direction, wherein the second direction is perpendicular to the first direction. The secondary battery can reduce the possibility of shrinkage of the separators.
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 50/178 - Dispositions pour introduire des connecteurs électriques dans ou à travers des boîtiers adaptées à la forme des cellules pour des cellules en forme de poches ou de sacs souples
H01M 50/531 - Connexions d’électrodes dans un boîtier de batterie
38.
SECONDARY BATTERY, ELECTROCHEMICAL DEVICE, ELECTRIC APPARATUS, AND PREPARATION METHOD FOR SECONDARY BATTERY
121212122<90°. The first tab extends from the fifth edge of the electrode assembly. The second tab extends from the sixth edge of the electrode assembly. The secondary battery is conducive to improving the energy density.
H01M 50/178 - Dispositions pour introduire des connecteurs électriques dans ou à travers des boîtiers adaptées à la forme des cellules pour des cellules en forme de poches ou de sacs souples
Disclosed in the present application are a secondary battery and an electrical device. The secondary battery comprises a housing and an electrode assembly, the electrode assembly being accommodated in the housing, the housing comprising a housing body and a housing cover, and the housing cover comprising a first edge and a second edge adjacent to the first edge. The housing cover is provided with a groove at least comprising a first groove section and a second groove section, and when observed in the thickness direction of the housing cover, the first groove section and the second groove section are curved. The first groove section comprises a first end connected to the second groove section and a second end which serves as the tail end of the groove. The first groove section extends in the direction facing away from the second edge. In the extension direction from the first end to the second end, the first groove section is parallel to the first edge or gradually extends away from the first edge. When the internal pressure of the secondary battery is excessively high, the groove can rupture to release pressure and discharge gas, which helps to reduce the risk of fire and explosion of the secondary battery. The first groove section can guide the crack of the groove, which helps to reduce the likelihood of the housing cover bursting open along with the groove, thereby improving the safety of the secondary battery.
H01M 50/143 - Boîtiers primairesFourreaux ou enveloppes pour protéger contre les dommages causés par des facteurs externes ignifugesBoîtiers primairesFourreaux ou enveloppes pour protéger contre les dommages causés par des facteurs externes à l'épreuve des explosions
Disclosed in the present application are a battery cell and an electrical apparatus. The battery cell comprises a casing and an electrode assembly, wherein the casing forms a cavity containing an electrolyte, the electrode assembly being arranged in the cavity; the surface of an active material layer of the electrode assembly is recessed inwards to form grooves, the grooves extending to the edge of an electrode sheet; the thickness of the active material layer is M; in the thickness direction, the thickness of a separator is C; the separator and a first electrode sheet are laminated in the thickness direction, the porosity of the separator being F; an interval between two adjacent grooves in a second direction is H; a cross-sectional area of the grooves on a cross-section perpendicular to the extension direction is G, and 0.03M×H≤(G+(0.1C×F×H)). By means of reasonably arranging the separator and the grooves, the separator and the grooves can transport a sufficient amount of the electrolyte to the active material layer to infiltrate the interior of the electrode assembly and satisfy the consumption of the electrolyte by the electrode assembly, which is beneficial to replenishing the electrolyte inside the electrode assembly in a timely manner during a cycle process, and is beneficial to prolonging the cycle life of the battery cell.
The present application provides a battery cell and an electric device. A casing of the battery cell comprises a first wall and a second wall which are opposite to each other in the thickness direction of the battery cell, wherein the first wall comprises a first main body wall and a first step wall, and the first step wall is recessed toward the second wall relative to the first main body wall. The battery cell further comprises an electrode assembly and an electrode terminal, wherein the electrode assembly is provided in the casing, and the electrode assembly comprises a first electrode sheet and a second electrode sheet having opposite polarities. The electrode terminal is provided on the first step wall, and is electrically connected to the first electrode sheet, and a thickness H0 of the first step wall satisfies that H0≤0.2 mm. A reinforcing structure is formed between the first main body wall and the first step wall, such that the first step wall is less likely to deform when stressed, thereby maintaining the effectiveness of sealing between the electrode terminal and the first step wall, reducing the risk of electrolyte leakage, and improving the safety of the battery cell.
An electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. The positive electrode plate, the negative electrode plate, and the separator are wound for multiple turns to form an electrode body. The electrode body includes a flat portion and corner portions provided at two opposite ends of the flat portion. The positive electrode plate has multiple first protrusions provided corresponding to the corner portions. Along a direction of the positive electrode plate, a height Hm (μm) of the first protrusions satisfies: 15≤Hm≤80. Based on a total weight of the negative electrode active material layer, a weight percentage A of the silicon material particles satisfies: 5≤A≤50, and an average particle diameter Da (μm) of the silicon material particles satisfies: 1≤Da≤30.
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/133 - Électrodes à base de matériau carboné, p. ex. composés d'intercalation du graphite ou CFx
H01M 4/134 - Électrodes à base de métaux, de Si ou d'alliages
H01M 4/38 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'éléments simples ou d'alliages
H01M 4/587 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 4/70 - Supports ou collecteurs caractérisés par la forme ou la configuration
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
43.
ANODE MATERIAL, ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE COMPRISING THE SAME
An anode material includes silicon-based particles and graphite particles, the average sphericity degree of the graphite particles is A, the average sphericity degree of the silicon-based particles is B, and A and B meet: 0
H01M 4/38 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'éléments simples ou d'alliages
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/583 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
An electrolyte solution and an electrochemical device. The electrolyte solution comprises at least one of compounds of formula I and a polycyano compound. Formula I, wherein R1, R2, R3and R4133 alkyl group. On the basis of the total mass of the electrolyte solution, the mass content of the compound of formula I is A, and the mass content of the polycyano compound is B, wherein 0.01%≤A≤5%, and 0.1%≤B≤10%. The electrochemical device has good cycle performance and high-temperature storage performance.
Provided are an electrolyte and an electrochemical device. The electrolyte comprises fluoroethylene carbonate and at least one of compounds represented by formula I. On the basis of the total mass of the electrolyte, the mass content of the fluoroethylene carbonate is A, and the mass content of the compound represented by formula I is B, 0.01%≤A≤10.0%, and 0.01%≤B≤3.0%. By adjusting the type of the electrolyte, the mass content of the fluoroethylene carbonate, and the mass content of the compound represented by formula I within the above ranges, the components of the electrolyte of an electrochemical device have suitable mass content and, by means of an synergy, form a fluorine- and sulfur-rich interfacial film on the surface of a negative electrode sheet, such that the storage performance and cycle performance of the electrochemical device can be improved.
An electrochemical device and an electronic device. The electrochemical device comprises a positive electrode sheet, a quasi-solid-state electrolyte, and a negative electrode sheet, wherein the positive electrode sheet comprises a positive electrode material; the positive electrode material contains an Na element and a B element; on the basis of the mass of the positive electrode material, the mass content of the Na element is 0.1%-3%, and the mass content of the B element is 0.001%-1%; the positive electrode sheet and the negative electrode sheet each comprise a solid-state electrolyte; and the solid-state electrolyte includes a lithium aluminum titanium phosphate solid-state electrolyte and/or a lithium lanthanum titanium oxide solid-state electrolyte. The present invention can improve the cycle performance and safety performance of a battery.
A secondary battery and an electronic apparatus. The secondary battery comprises a housing, an electrode assembly, a first bonding member, and a plurality of bonding portions. A first electrode sheet of the electrode assembly comprises a first active material layer, a first current collector, and a second active material layer. The first current collector comprises a first surface facing a winding central axis and a second surface opposite the first surface, and the first active material layer and the second active material layer are respectively provided on the first surface and the second surface. The first electrode sheet of an outermost turn comprises a first region and a first ending region which are sequentially connected in a winding direction. The first ending region is not provided with the first active material layer and the second active material layer, and comprises a first edge and a second edge arranged opposite to each other in the winding direction. The plurality of bonding portions are bonded to the second surface located in the first ending region, and are also bonded to a surface of the housing facing the electrode assembly. The first bonding member bonds to the second surface located in the first ending region, and extends beyond the second edge and bonds to the second surface located in the first region.
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
111≤1.2 mm. This allows a more rational distribution of stress near the bend of the first tab bundle, mitigating reverse folding and indentation of the first tab bundle caused by stress concentration, and thereby reducing compression damage to a separator, and reducing the risk of short circuits.
H01M 50/538 - Connexions de plusieurs conducteurs ou languettes d’électrodes empilées enroulées ou pliées
H01M 50/533 - Connexions d’électrodes dans un boîtier de batterie caractérisées par la forme des conducteurs ou des languettes
H01M 50/536 - Connexions d’électrodes dans un boîtier de batterie caractérisées par le procédé de fixation des conducteurs aux électrodes, p. ex. soudage
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
Disclosed in the present application are a secondary battery and an electric device. The secondary battery comprises a casing, an electrode assembly, and a first adhesive member. The casing comprises a first casing and a second casing that are welded to each other. The electrode assembly is accommodated in an accommodating cavity; the electrode assembly comprises first electrode sheets, second electrode sheets, and separators. Each separator comprises an isolation portion and an extension portion, wherein in a first direction, the projection of the isolation portion overlaps the projection of the first electrode sheet; the extension portion is connected to the isolation portion, and the extension portion extends beyond the first electrode sheet. The first adhesive member comprises a first portion, a second portion, and a third portion arranged in sequence, and the electrode assembly comprises a first surface and a second surface, wherein the first portion is bonded to the first surface, the third portion is bonded to the second surface, and the second portion connects the first portion and the third portion; when viewed in the first direction, the part of the extension portion not covered by the first adhesive member extends beyond the second portion in a second direction. The present secondary battery helps reduce the possibility of the extension portion interfering with the connection between the first casing and the second casing.
H01M 10/0583 - Structure ou fabrication d'accumulateurs à éléments de structure pliés à l'exception des éléments enroulés, c.-à-d. des électrodes positives ou négatives pliées ou des séparateurs pliés, p. ex. à électrodes ou séparateurs en forme de Z
The present application provides a secondary battery and an electronic device. The secondary battery comprises a negative electrode sheet; the negative electrode sheet comprises a first material layer and a second material layer located on the surface of the first material layer; the first material layer comprises a first negative electrode active material; the second material layer comprises a second negative electrode active material; the sphericity S1 of the first negative electrode active material satisfies: 0.50≤S1<0.85; the hardness of the first negative electrode active material is Cs1 Mpa, wherein 10≤Cs1≤15; the sphericity S2 of the second negative electrode active material satisfies: S2≥0.85; and the hardness of the second negative electrode active material is Cs2 Mpa, wherein Cs2≥16. The negative electrode sheet in the present application can prolong the calendar life of the secondary battery.
The present application discloses a battery cell and an electric apparatus. The battery cell comprises a housing and an electrode assembly, wherein the housing forms an accommodating cavity filled with an electrolyte; the electrode assembly is disposed within the accommodating cavity; a surface of an active material layer of a first electrode sheet in the electrode assembly away from a first current collector is recessed inward to form a groove; an end of the groove in an extension direction is in communication with an edge of the first electrode sheet; the first electrode sheet comprises a first edge and a second edge connected to each other; an included angle between the extension direction of the groove and the first edge is C, wherein 5° ≤ D ≤ 85°; and an included angle between the extension direction of the groove and the second edge is E, wherein 5° ≤ E ≤ 85°. When an electrolyte flows along a groove, a corresponding displacement component can be resolved in both an extension direction of a first edge and an extension direction of a second edge, allowing the electrolyte to better wet an interior of an electrode assembly. This is beneficial to replenishing electrolytes inside electrode assemblies in a timely manner during a cycling process, and helps prolong battery cell cycle life.
The present application relates to an electrolyte, a secondary battery, and an electronic device. Specifically, the present application provides an electrolyte. The electrolyte comprises propylene carbonate, propyl propionate, succinonitrile, and 1,3,6-hexanetricarbonitrile. Based on 100 parts by mass of the electrolyte, the propylene carbonate is 14 to 20 parts by mass, the propyl propionate is 10 to 55 parts by mass, the succinonitrile is 0.3 to 4 parts by mass, and the 1,3,6-hexanetricarbonitrile is 1 to 6 parts by mass. The present application can improve the low-temperature discharge performance and over-temperature safety performance of a secondary battery.
H01M 10/0569 - Matériaux liquides caracterisés par les solvants
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
53.
NON-AQUEOUS ELECTROLYTE, ELECTROCHEMICAL APPARATUS, AND ELECTRONIC APPARATUS
A non-aqueous electrolyte includes ethylene carbonate, propylene carbonate, propyl propionate, and ethyl propionate. Based on a total mass of the non-aqueous electrolyte, mass percentages of ethylene carbonate, propylene carbonate, propyl propionate, and ethyl propionate are A %, B %, C %, and D % respectively, where 5≤A≤15, 5≤B≤15, 30≤C≤50, 5≤D≤20, A≥B, and 2≤C/D≤3.5.
H01M 10/0569 - Matériaux liquides caracterisés par les solvants
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/131 - Électrodes à base d'oxydes ou d'hydroxydes mixtes, ou de mélanges d'oxydes ou d'hydroxydes, p. ex. LiCoOx
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0568 - Matériaux liquides caracterisés par les solutés
54.
NON-AQUEOUS ELECTROLYTE, ELECTROCHEMICAL APPARATUS, AND ELECTRONIC APPARATUS
A non-aqueous electrolyte includes ethylene carbonate, propylene carbonate, diethyl carbonate, and propyl propionate. Based on a total mass of the non-aqueous electrolyte, mass percentages of ethylene carbonate, propylene carbonate, diethyl carbonate, and propyl propionate are A %, B %, C %, and D % respectively, 10≤A≤20, 9≤B≤15, 10≤C≤20, 10≤D≤25, and 1≤(C+D)/(A+B)≤1.3.
H01M 10/0569 - Matériaux liquides caracterisés par les solvants
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0568 - Matériaux liquides caracterisés par les solutés
A secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte, the electrolyte includes propionate and a first additive, and the first additive includes at least one of a compound represented by formula (Ia), a compound represented by formula (Ib), or a compound represented by formula (Ic).
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0569 - Matériaux liquides caracterisés par les solvants
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/505 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de manganèse d'oxydes ou d'hydroxydes mixtes contenant du manganèse pour insérer ou intercaler des métaux légers, p. ex. LiMn2O4 ou LiMn2OxFy
H01M 4/131 - Électrodes à base d'oxydes ou d'hydroxydes mixtes, ou de mélanges d'oxydes ou d'hydroxydes, p. ex. LiCoOx
H01M 10/054 - Accumulateurs à insertion ou intercalation de métaux autres que le lithium, p. ex. au magnésium ou à l'aluminium
A secondary battery includes an electrolyte and a negative electrode plate, where a viscosity of the electrolyte is P MPa·s. A first material layer includes a first negative electrode active material, which includes no silicon element. A second material layer includes a second negative electrode active material and a polyurethane binder. Based on a mass of the second material layer, a mass percentage of the silicon element is W1%, and a mass percentage of the polyurethane binder is W2%. Along a thickness direction of the negative electrode plate, the negative electrode active material layer is provided with at least one groove, where a cross-sectional area of the groove is S μm2, and a depth of the groove is H μm. S and W1 satisfy: 1≤W1≤50, and S=K1+20W1. K1 satisfies: 400≤K1≤800. H, P, W2, and S satisfy: 1≤W2≤10, 2≤P≤8, and H=K2W2P/S. K2 satisfies: 800≤K2≤1200.
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/133 - Électrodes à base de matériau carboné, p. ex. composés d'intercalation du graphite ou CFx
H01M 4/134 - Électrodes à base de métaux, de Si ou d'alliages
H01M 4/38 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'éléments simples ou d'alliages
H01M 4/587 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 4/62 - Emploi de substances spécifiées inactives comme ingrédients pour les masses actives, p. ex. liants, charges
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
61.
POSITIVE ELECTRODE MATERIAL, SECONDARY BATTERY, AND ELECTRONIC DEVICE
33mc structure and a Cmca structure; the matrix comprises lithium, cobalt, and calcium; based on metal elements in the lithium-cobalt composite oxide other than lithium, a molar content of calcium is a%, wherein 0.1≤a≤5; and the element layer comprises niobium and oxygen; based on the metal elements in the lithium-cobalt composite oxide other than lithium, a molar content of niobium is b%, wherein 0.05≤b≤1. The positive electrode material can maintain excellent electrochemical performance under high-temperature and long-term floating charge conditions, and improve both the high-temperature safety and floating charge performance of the secondary battery.
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/485 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques d'oxydes ou d'hydroxydes mixtes pour insérer ou intercaler des métaux légers, p. ex. LiTi2O4 ou LiTi2OxFy
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
62.
NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND ELECTRONIC DEVICE
Provided are a non-aqueous electrolyte secondary battery and an electronic device. The non-aqueous electrolyte secondary battery comprises a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. The negative electrode sheet comprises a negative electrode current collector and a negative electrode material layer provided on at least one surface of the negative electrode current collector. The coating weight of the negative electrode material layer is D g/1540.25 mm21234561234561212122)/D≤100, and 0.10≤D≤0.18. By means of the described arrangement, the cycle life of a non-aqueous electrolyte secondary battery can be prolonged.
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 4/133 - Électrodes à base de matériau carboné, p. ex. composés d'intercalation du graphite ou CFx
63.
NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND ELECTRONIC DEVICE
1231233≤2.8. By means of the described configurations, the non-aqueous electrolyte secondary battery can achieve a long cycle life while maintaining safety performance, and the electronic device has good performance in use.
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 4/48 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
121212122≤200; and in any region on the surface of the adhesive layer, the ratio of the number of particles of the first inert substance to the number of particles of the second inert substance is 3:7-7:3. By means of the described configuration, the secondary battery has good dynamic performance.
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 50/46 - Séparateurs, membranes ou diaphragmes caractérisés par leur combinaison avec des électrodes
66.
POSITIVE ELECTRODE SHEET, SECONDARY BATTERY, AND ELECTRONIC DEVICE
The present application provides a positive electrode sheet, a secondary battery, and an electronic device. The positive electrode sheet comprises a positive electrode current collector and a positive electrode material layer arranged on at least one surface of the positive electrode current collector. The positive electrode material layer comprises a positive electrode additive. Based on the mass of the positive electrode material layer, the mass percentage of the positive electrode additive is m%, wherein 0.1≤m≤0.5. The positive electrode additive comprises at least one of the structural formula shown in formula (I) or the structural formula shown in formula (II). The secondary battery of the present application has good high-temperature cycle performance.
H01M 4/13 - Électrodes pour accumulateurs à électrolyte non aqueux, p. ex. pour accumulateurs au lithiumLeurs procédés de fabrication
H01M 4/62 - Emploi de substances spécifiées inactives comme ingrédients pour les masses actives, p. ex. liants, charges
H01M 10/42 - Procédés ou dispositions pour assurer le fonctionnement ou l'entretien des éléments secondaires ou des demi-éléments secondaires
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
The present application provides an electrochemical device and an electronic device. In the present application, a first adhesive member is provided on the outermost ring (a first electrode sheet) of an electrode assembly, the first adhesive member is at least bonded to a first arc-shaped section, the first adhesive member and the first electrode sheet have the same length or the edge in a first direction extends beyond the edge of the first electrode sheet, and the relative position between the first adhesive member and a second adhesive member is adjusted, so that the first adhesive member reinforces the arc-shaped section which is a weak region, fixes the edge of the first electrode sheet, and also has a certain reinforcing effect on the first electrode sheet. In addition, the first adhesive member has a low weight, and the influence thereof on the energy density of the electrochemical device is almost negligible. Thus, the electrochemical device of the present application has both high energy density and improved safety performance.
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
H01M 50/474 - Éléments d'espacement à l'intérieur des cellules autres que les séparateurs, les membranes ou les diaphragmesLeurs procédés de fabrication caractérisés par leur position dans les cellules
An electrode assembly includes a plurality of electrode plates and a separator disposed between two of the electrode plates of opposite polarities. At least one of the electrode plates has a plurality of protrusions. The protrusions have a height H (μm). When 20≤H≤80 is satisfied, the protrusions can provide strong support to improve electrolyte infiltration effect. The separator includes a base film and a ceramic layer connected to the base film, and the ceramic layer is provided on a side of the base film along a thickness direction. The base film has a puncture strength C (gf), the ceramic layer has a thickness D1 (μm), C satisfies 100≤C≤500, and D1 satisfies 1≤D1≤6.
An electrode assembly includes two electrode plates and a separator, at least one electrode plate including a main body portion and corner portions, the main body portion includes main body portion protrusions, a height of the main body portion protrusions is H1 (μm), the corner portion including multiple corner portion protrusions, a height of the corner portion protrusions being H2 (μm), an orthographic projection of the main body portion protrusions and of the corner portion protrusions along a thickness direction of the electrode plate forming a first pattern and a second pattern, an average radial dimension of the first pattern being R1 (mm), an average radial dimension of the second pattern being R2 (mm), satisfying: −0.2665≤H1/1000R1−H2/1000R2≤0.0131, the separator including a base film and an adhesive layer, a thickness of the adhesive layer being F (μm), satisfying: 4≤H2/F≤800.
H01M 50/46 - Séparateurs, membranes ou diaphragmes caractérisés par leur combinaison avec des électrodes
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
A secondary battery and an electronic device. The secondary battery comprises an electrode assembly and a bonding part. The bonding part includes a substrate layer, a first metal particle layer, and a first bonding layer, which are stacked in a first direction. The first metal particle layer is located between the substrate layer and the first bonding layer. The first metal particle layer includes at least one layer of metal particles. The first bonding layer is bonded to the electrode assembly. In the secondary battery, the first metal particle layer includes at least one layer of metal particles. Compared with the ordinary adhesive tape, the bonding part having the first metal particle layer itself has high structural strength and good support force. In addition, the first metal particle layer enables the bonding part to have high ductility, reduces the risk of brittle fracture when resisting an external impact, and increases the pass rate of a blunt nail puncture and extrusion test for a secondary battery, thereby improving the safety performance of the secondary battery.
H01M 50/474 - Éléments d'espacement à l'intérieur des cellules autres que les séparateurs, les membranes ou les diaphragmesLeurs procédés de fabrication caractérisés par leur position dans les cellules
71.
SEPARATOR, ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE
The present application discloses a separator, an electrochemical device and an electronic device. The separator of embodiments of the present application comprises a base membrane and a first coating arranged on at least one side of the base membrane, the first coating comprises polydopamine and an adhesive polymer, and the Young's modulus of the base membrane is 52-90 MPa. The separator has good structural stability and high mechanical strength, and the decrease in separator strength when the separator is immersed in an electrolyte and swells can be effectively mitigated, thereby improving the quick charging performance and the structural stability of an electrochemical device at a low temperature.
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
and a compound of formula III
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
and a compound of formula III
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
and a compound of formula III
and the second compound comprising at least one of a compound of formula IV
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
and a compound of formula III
and the second compound comprising at least one of a compound of formula IV
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
and a compound of formula III
and the second compound comprising at least one of a compound of formula IV
and a compound of formula V
An electrolyte comprises a fluorine-containing cyclic carbonate represented by formula I
a first compound and a second compound, the first compound comprising at least one of a compound of formula II
and a compound of formula III
and the second compound comprising at least one of a compound of formula IV
and a compound of formula V
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/505 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de manganèse d'oxydes ou d'hydroxydes mixtes contenant du manganèse pour insérer ou intercaler des métaux légers, p. ex. LiMn2O4 ou LiMn2OxFy
H01M 4/13 - Électrodes pour accumulateurs à électrolyte non aqueux, p. ex. pour accumulateurs au lithiumLeurs procédés de fabrication
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
74.
POSITIVE ELECTRODE MATERIAL, SECONDARY BATTERY AND ELECTRONIC APPARATUS
Disclosed in the present application are a positive electrode material, a secondary battery and an electronic apparatus. The positive electrode material comprises a lithium phosphate salt, the lithium phosphate salt comprising a first element and a second element; the first element comprises cobalt and nickel; on the basis of the total mass of the positive electrode material, the mass percentage of the first element is a%, and 35.5≤a≤37.5; the second element comprises tungsten, vanadium and chromium; and on the basis of the total mass of the positive electrode material, the mass percentage of the second element is b%, and 0.1≤b≤1.5. The positive electrode material is rod-shaped grains having an olivine structure, wherein the length-to-diameter ratio of a single grain of the positive electrode material is P, and, on the basis of the number of grains of the positive electrode material, the proportion of the number of grains whose P≥1.5 is A%, and 50≤A≤100; the average length of the positive electrode material is I nm, and 150≤I≤1000. The positive electrode material provided in the present application can improve the energy density of secondary batteries, and improve both low-temperature discharge performance and high-rate discharge performance.
H01M 4/58 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de composés inorganiques autres que les oxydes ou les hydroxydes, p. ex. sulfures, séléniures, tellurures, halogénures ou LiCoFyEmploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de structures polyanioniques, p. ex. phosphates, silicates ou borates
C01B 25/45 - Phosphates contenant plusieurs métaux ou un métal et l'ammonium
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
The present application discloses a lithium-ion battery electrode sheet. The electrode sheet comprises a current collector, at least one surface of the current collector being provided with an active material layer, and the surface of the active material layer being provided with trenches. By forming trenches in the surface of the electrode sheet of the present application, active sites and lithium-ion diffusion channels on the surface of the negative electrode sheet are increased, so that an electrolyte can fully infiltrate the active material layer, thereby mitigating lithium precipitation.
H01M 4/13 - Électrodes pour accumulateurs à électrolyte non aqueux, p. ex. pour accumulateurs au lithiumLeurs procédés de fabrication
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
A battery cell and an electric device. The battery cell comprises an electrode assembly; the electrode assembly comprises a first electrode sheet; the first electrode sheet comprises a first current collector and a first active material layer; in the thickness direction of the first current collector, at least one side of the first current collector is provided with the first active material layer; the surface of the at least one first active material layer facing away from the first current collector is provided with first recesses and second recesses at intervals; the first recesses and the second recesses are arranged at intervals in the length direction of the first current collector; and the volume of each first recess is greater than the volume of each second recess, so that the contact area between the first active material layer and an electrolyte can be increased with less loss of active materials, thereby improving the wettability and enabling the battery cell to have higher energy density and higher safety performance.
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
78.
POSITIVE ACTIVE MATERIAL AND ELECTROCHEMICAL DEVICE CONTAINING SAME
A positive active material, containing a compound with a P63mc space group. In an XRD pattern of the positive active material, a (002) crystal plane of the compound with the P63mc space group is located between 17.5° and 19°, and a full width at half maximum of the (002) crystal plane falls between 0.05 and 0.1. The positive active material at a high voltage of 4.8 V exhibits a considerable discharge capacity and desirable structural reversibility and cycle stability.
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/505 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de manganèse d'oxydes ou d'hydroxydes mixtes contenant du manganèse pour insérer ou intercaler des métaux légers, p. ex. LiMn2O4 ou LiMn2OxFy
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
The present application discloses a secondary battery and an electric device. The secondary battery comprises an electrode assembly and a pouch for accommodating the electrode assembly. The pouch comprises a pouch body and side seal flaps, and the electrode assembly is disposed in the pouch body. The pouch body comprises side walls, and in the extension direction of the side seal flaps, each side seal flap is connected to the corresponding side wall and fixed to the side of the side wall away from the accommodating cavity. Each side seal flap comprises a sealed region and an unsealed region. Each unsealed region is in communication with the accommodating cavity. When the electrode assembly expands, at least a part of each side seal flap can be expanded outward, thereby improving the stress distribution at a first end of each side seal flap and improving the capability of the pouch to withstand expansion of the electrode assembly. Each sealed region is connected to the corresponding unsealed region, and the sealed regions can also reduce the possibility of excessive outward expansion of the side seal flaps while sealing the accommodating cavity. In this way, after the expansion of the electrode assembly, the integrity of the pouch is maintained, thereby facilitating improvement in the safety performance of the secondary battery.
Provided in the present application are a positive electrode sheet, a secondary battery and an electronic device, the positive electrode sheet comprising a positive electrode current collector and a positive electrode active material layer provided on at least one surface of the positive electrode current collector. The positive electrode active material layer comprises a positive electrode conductive agent, and the positive electrode conductive agent comprises carbon nanotubes having a dendritic structure, wherein the diameter of the carbon nanotubes is 3 nm to 15 nm; and the length of the longest branch in the carbon nanotubes is 5 μm to 30 μm. By means of the described arrangement, the positive electrode sheet has good conductivity, and when the positive electrode sheet is used in a secondary battery, the secondary battery has relatively low internal resistance.
33mc structure and a Cmca structure, and the lithium cobalt oxide particles comprising manganese and aluminum. Calculated on the basis of the molar content of metal elements other than lithium in the lithium cobalt oxide particles being 100%, the molar content of the manganese is a%, and the molar content of the aluminum is b%, where 0.5≤a/b≤40, and 0.2≤a+b≤6. In the present application, adding the manganese and the aluminum into the lithium cobalt oxide particles helps to improve the overall stability of the positive electrode material and reduce a deposition amount of cobalt in a negative electrode, such that the electrochemical apparatus has good high-temperature cycle performance.
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
82.
POSITIVE ELECTRODE MATERIAL, SECONDARY BATTERY, AND ELECTRONIC APPARATUS
Provided are a positive electrode material, a secondary battery, and an electronic apparatus. The positive electrode material comprises a lithium phosphate, and the lithium phosphate comprises first elements and second elements; the first elements include a manganese element and an iron element, and on the basis of the total mass of the positive electrode material, the mass percentage content of the first elements is a%, and 34.5≤a≤36.5; the second elements include a magnesium element and a titanium element, and on the basis of the total mass of the positive electrode material, the mass percentage content of the second elements is b%, and 0.05≤b≤1; the positive electrode material is composed of rod-shaped crystal grains having an olivine structure; the average length of the positive electrode material is I nm, and 150≤I≤1000; and the average cross-sectional diameter of the positive electrode material is D nm, and 50≤D≤300. The positive electrode material can improve the low-temperature discharge performance and high-rate discharge performance of the secondary battery.
H01M 4/58 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de composés inorganiques autres que les oxydes ou les hydroxydes, p. ex. sulfures, séléniures, tellurures, halogénures ou LiCoFyEmploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs de structures polyanioniques, p. ex. phosphates, silicates ou borates
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
83.
BATTERY CELL AND MANUFACTURING METHOD THEREFOR, AND ELECTRIC DEVICE
Embodiments of the present application provide a battery cell and a manufacturing method therefor, and an electric device. The battery cell comprises a casing, an electrode assembly, and a filler. The electrode assembly comprises a first electrode assembly and a second electrode assembly; the first electrode assembly and the second electrode assembly are stacked in a first direction; in a second direction, the length of the second electrode assembly is greater than that of the first electrode assembly; the second electrode assembly has a first surface facing the first electrode assembly; when viewed in the first direction, the second electrode assembly has an overlapping region that overlaps with the first electrode assembly, and a non‑overlapping region that does not overlap with the first electrode assembly; the side wall of the first electrode assembly close to the non-overlapping region in the second direction and a first surface of the non-overlapping region form a first step; the casing forms a second step corresponding to the first step, and an accommodating space is formed between the first step and the second step; the second direction is perpendicular to the first direction; and the filler is provided in the accommodating space. The technical solution of the present application can improve the safety and reliability of the battery cell.
H01M 10/0585 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure plats, c.-à-d. des électrodes positives plates, des électrodes négatives plates et des séparateurs plats
84.
BATTERY CELL AND MANUFACTURING METHOD THEREFOR, AND ELECTRICAL DEVICE
Provided in the embodiments of the present application are a battery cell and a manufacturing method therefor, and an electrical device. The battery cell comprises a housing and electrode assemblies. A first electrode assembly and a second electrode assembly are stacked in a first direction; in a second direction, the length of the second electrode assembly is greater than the length of the first electrode assembly; the side wall of the first electrode assembly close to a non-overlapping region in the second direction and a surface of the non-overlapping region form a first step; the housing forms a second step corresponding to the first step, an accommodating space being formed between the first step and the second step; the second electrode assembly has a first region, and the first region comprises a region overlapping the accommodating space in the first direction; in the first region, the difference in the bonding force between any two second negative electrode sheets and second separators connected thereto is less than or equal to 2 N/m, and the bonding force between any second negative electrode sheet and a second separator connected thereto is greater than or equal to 5 N/m. The technical solution of the present application can improve the safety and reliability of the battery cell.
H01M 10/0585 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure plats, c.-à-d. des électrodes positives plates, des électrodes négatives plates et des séparateurs plats
85.
ELECTROCHEMICAL APPARATUS AND ELECTRONIC APPARATUS
An electrochemical apparatus includes a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive electrode current collector and a positive electrode active material layer located on at least partial surface of the positive electrode current collector. The positive electrode active material layer has a compacted density of pd mg/cm3, where 2.6≤pd≤2.86. Based on a mass of the electrolyte, the electrolyte includes: ethylene carbonate with a mass percentage of A %, propylene carbonate with a mass percentage of B %, diethyl carbonate with a mass percentage of C %, ethyl propionate with a mass percentage of D %, and propyl propionate with a mass percentage of E %; where 1≤B/A≤8, and 5≤(E+D)/C≤14.
H01M 10/0567 - Matériaux liquides caracterisés par les additifs
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/131 - Électrodes à base d'oxydes ou d'hydroxydes mixtes, ou de mélanges d'oxydes ou d'hydroxydes, p. ex. LiCoOx
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
H01M 4/62 - Emploi de substances spécifiées inactives comme ingrédients pour les masses actives, p. ex. liants, charges
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0568 - Matériaux liquides caracterisés par les solutés
86.
ELECTROCHEMICAL APPARATUS AND ELECTRONIC APPARATUS
An electrochemical apparatus has a volumetric energy density of 850 Wh/L to 900 Wh/L and includes a positive electrode, a negative electrode, and an electrolyte. Based on a mass of the electrolyte, the electrolyte includes ethylene carbonate with a mass percentage of A %, propylene carbonate with a mass percentage of B %, ethyl propionate with a mass percentage of C %, and propyl propionate with a mass percentage of D %; where 0.02≤(A+B)/(C+D)≤0.5 and 1≤D/C≤10.
An electrode plate including a current collector, a first transition layer, a second transition layer, two active substance layers, a first conductive member, and a second conductive member. The current collector includes a support layer, a first conductive layer, and a second conductive layer. The first and second transition layers are located in a first segment of the current collector. A first conductive member and a second conductive member are welded to form a plurality of weld marks, at least one weld mark being connected to the current collector. The current collector includes a first section and a second section, a projection of an edge section of the active substance layer adjacent to the weld marks coincides with a projection of the first section. The second section is provided with the weld marks. The tensile strength of the first section is less than the tensile strength of the second section.
H01M 50/536 - Connexions d’électrodes dans un boîtier de batterie caractérisées par le procédé de fixation des conducteurs aux électrodes, p. ex. soudage
H01M 4/62 - Emploi de substances spécifiées inactives comme ingrédients pour les masses actives, p. ex. liants, charges
A current collector includes a support layer, and a first conductive layer and a second conductive layer disposed on two sides of the support layer in a first direction. The first transition layer is disposed on a surface of the first conductive layer facing away from the support layer. The second transition layer is disposed on a surface of the second conductive layer facing away from the support layer. The first conductive member is disposed on the first conductive layer. The second conductive member is disposed on the second conductive layer. The first conductive member and the second conductive member are welded to form a plurality of weld marks arranged along a second direction, where at least one weld mark is further connected to the current collector. The two protective members are respectively located on two sides of the current collector in the first direction.
H01M 4/70 - Supports ou collecteurs caractérisés par la forme ou la configuration
H01M 50/474 - Éléments d'espacement à l'intérieur des cellules autres que les séparateurs, les membranes ou les diaphragmesLeurs procédés de fabrication caractérisés par leur position dans les cellules
H01M 50/536 - Connexions d’électrodes dans un boîtier de batterie caractérisées par le procédé de fixation des conducteurs aux électrodes, p. ex. soudage
H01M 50/54 - Connexion de plusieurs conducteurs ou languettes d’électrodes empilées en forme de plaque, p. ex. barrettes ou ponts de pôles d’électrode
89.
SEALANT, SEALING ASSEMBLY, BATTERY CELL, AND ELECTRIC DEVICE
The present application discloses a sealant, a sealing assembly, a battery cell, and an electric device. The sealant comprises a first material and a second material mixed with each other, the first material has a first melting point, the second material has a second melting point, the range of the first melting point A is 50°C≤A≤120°C, and the range of the second melting point B is 120°C
C09J 123/00 - Adhésifs à base d'homopolymères ou de copolymères d'hydrocarbures aliphatiques non saturés ne possédant qu'une seule liaison double carbone-carboneAdhésifs à base de dérivés de tels polymères
A battery cell and an electric apparatus. The battery cell comprises a battery cell casing, an electrode assembly, and a tab assembly, wherein the battery cell casing comprises a main body portion and a sealing portion; the electrode assembly is arranged in the main body portion; and the tab assembly comprises a tab and two pieces of insulating adhesive, the tab being connected to the electrode assembly and extending from the sealing portion, in the direction of thickness of the tab, the tab being arranged between the two pieces of insulating adhesive, and the insulating adhesive connecting the battery cell casing to the tab. At 25°C, the tensile force between the insulating adhesive and the battery cell casing and/or the tab ranges from 5 N/mm to 10 N/mm, thereby improving the packaging tensile force of the insulating adhesive under room temperature conditions and improving the packaging reliability of the battery cell under room temperature conditions; and at 120°C, the tensile force between the insulating adhesive and the battery cell casing and/or the tab ranges from 0.01 N/mm to 0.2 N/mm, thereby facilitating the rapid formation of a pressure relief channel after the battery cell expands, improving the heat dissipation efficiency and thus improving the safety performance of the battery cell.
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 50/197 - Éléments de scellement caractérisés par le matériau ayant une structure en couches
B32B 27/08 - Produits stratifiés composés essentiellement de résine synthétique comme seul composant ou composant principal d'une couche adjacente à une autre couche d'une substance spécifique d'une résine synthétique d'une sorte différente
1122111222122. In this way, the present application is conducive to reducing the current density of the first electrode sheet, and slowing down the consumption rate of an electrolyte, thereby reducing the possibility of lithium precipitation occurring on the first electrode sheet.
Disclosed in the present application are a secondary battery, a manufacturing method for the secondary battery, and an electronic device. The secondary battery comprises a case, an electrolyte, and an electrode assembly, wherein the electrode assembly and the electrolyte are disposed within the case. The electrode assembly comprises at least two electrode sheet laminates and a plurality of first electrode sheets stacked together. Each electrode sheet laminate comprises a second electrode sheet and two separators. Each separator comprises a first part, a second part, and a third part, the third part being connected between the first part and the second part. The first parts of the two separators are bonded to each other to form a first bonded portion, and the second parts of the two separators are bonded to each other to form a second bonded portion. Parts of the first bonded portions of the at least two electrode sheet laminates are stacked and bonded to each other to form a first bonded member, and parts of the second bonded portions of the at least two electrode sheet laminates are stacked and bonded to each other to form a second bonded member. The present application can improve the drop performance and enhance the safety of the secondary battery while reducing the energy density loss of the secondary battery.
A secondary battery includes an electrode assembly and a tab. The electrode assembly includes a negative electrode plate. The negative electrode plate includes a negative current collector and a negative active layer disposed on at least one surface of the negative current collector. The negative current collector includes a first edge and a second edge opposite to each other in a first direction. The tab extends out of the electrode assembly through the first edge along the first direction. The negative active layer includes a first edge region provided with a plurality of first strip-shaped grooves. The first edge region covers the first edge and extends toward the second edge. In the first direction, the first edge region includes a first end portion located at the first edge and a second end portion opposite to the first end portion.
A secondary battery includes a negative electrode plate, where the negative electrode plate includes a current collector, a first active material layer, and a second active material layer, the first active material layer is disposed on at least one surface of the current collector, the second active material layer is disposed on a side of the first active material layer facing away from the current collector, the first active material layer includes a silicon-based material and a first graphite material, the second active material layer includes a second graphite material and an inorganic material, and a ratio of a particle size Dv50 of the inorganic material to a particle size Dv50 of the second graphite material is less than 0.23.
H01M 4/38 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'éléments simples ou d'alliages
H01M 4/587 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/42 - Procédés ou dispositions pour assurer le fonctionnement ou l'entretien des éléments secondaires ou des demi-éléments secondaires
95.
SECONDARY BATTERY, ELECTRIC DEVICE, AND PREPARATION METHOD OF SECONDARY BATTERY
A secondary battery includes a negative electrode plate, where the negative electrode plate includes a current collector and a first active material layer, the first active material layer is disposed on at least one surface of the current collector, the first active material layer includes a silicon-based material and a solid-state electrolyte, and the solid-state electrolyte is at least partially bound to a surface of silicon in the silicon-based material. In the secondary battery and an electric device, the solid-state electrolyte is at least partially bound to the surface of silicon in the silicon-based material.
H01M 4/134 - Électrodes à base de métaux, de Si ou d'alliages
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/133 - Électrodes à base de matériau carboné, p. ex. composés d'intercalation du graphite ou CFx
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 4/38 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'éléments simples ou d'alliages
H01M 4/587 - Matériau carboné, p. ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 10/0565 - Matériaux polymères, p. ex. du type gel ou du type solide
An electrochemical apparatus including a housing and a pressure relief mechanism. A first wall of the housing is provided with a first through hole. The pressure relief mechanism covers the first through hole, the pressure relief mechanism includes an adhesive film, the adhesive film is capable of melting or losing adhesion when heated to form a first pressure relief channel, a second wall of the housing is provided with a score groove, and the score groove is capable of rupturing when an internal pressure of the housing reaches a threshold to form a second pressure relief channel. A depth S1 of the score groove and a thickness S2 of the second wall meet 0.1*S2≤S1≤0.95*S2.
An electrode plate includes a current collector. On a side in a width direction of the current collector, the current collector is provided with a plurality of first slots and a plurality of second slots. Each of the first slots is provided with one tab or two tabs that are spaced, and the second slot is provided with no tab. In a length direction of the current collector, an odd number of second slots are provided between adjacent two of the first slots.
H01M 50/538 - Connexions de plusieurs conducteurs ou languettes d’électrodes empilées enroulées ou pliées
H01M 4/70 - Supports ou collecteurs caractérisés par la forme ou la configuration
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
H01M 50/474 - Éléments d'espacement à l'intérieur des cellules autres que les séparateurs, les membranes ou les diaphragmesLeurs procédés de fabrication caractérisés par leur position dans les cellules
98.
INSULATING ADHESIVE, TAB ASSEMBLY, BATTERY CELL, AND ELECTRIC DEVICE
The present application discloses an insulating adhesive, a tab assembly, a battery cell, and an electric device. The insulating adhesive comprises a surface layer. The surface layer has a melt flow index of 4-20 g/10 min at 230ºC under a load of 2.16 kg and a number-average molecular weight of 10000-130000 g/mol. By setting the melt flow index of the surface layer at 230ºC under a load of 2.16 kg and the number-average molecular weight of the surface layer, the flowability of the surface layer after being melted is improved, thereby enlarging overflowed adhesive lumps formed after the surface layer is melted, reducing liquid leakage caused by voids and/or bubbles, and enhancing sealing peel strength and sealing reliability of the battery cell under room-temperature working conditions; in addition, the improved flowability of the surface layer enables the rapid formation of pressure relief channels when the battery cell undergoes swelling, thereby improving heat dissipation efficiency and thus enhancing the safety performance of the battery cell.
C09J 123/00 - Adhésifs à base d'homopolymères ou de copolymères d'hydrocarbures aliphatiques non saturés ne possédant qu'une seule liaison double carbone-carboneAdhésifs à base de dérivés de tels polymères
C09J 7/20 - Adhésifs sous forme de films ou de pellicules caractérisés par leur support
The present application discloses a secondary battery and an electronic apparatus. The secondary battery comprises a positive electrode sheet; the positive electrode sheet comprises a positive electrode current collector and a positive electrode mixture layer arranged on at least one surface of the positive electrode current collector; the positive electrode mixture layer comprises a first material and a second material; and the first material comprises a nickel element and a manganese element, and the second material comprises a lithium element, an iron element, and a phosphorus element. A differential capacity-voltage (dQ/dV-V) plot of the secondary battery during discharge comprises a first peak and a second peak; and the peak position of the first peak ranges from 3.05 V to 3.45 V, and the peak position of the second peak ranges from 3.95 V to 4.3 V. The secondary battery provided in the present application has good comprehensive performance.
An electrochemical device includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet includes a positive electrode current collector and a positive electrode material layer disposed on at least one surface of the positive electrode current collector, where the positive electrode material layer includes a positive electrode active material. The positive electrode sheet is provided with a plurality of protrusions spaced apart from each other. A height of the protrusions is H m, 20≤H≤80; a radius of the each protrusions is R mm, 0.3≤R≤10; a surface area of the each protrusions is S mm2, 0.08≤S≤2.51; and the protrusions are formed by a portion of the positive electrode sheet protruding on one side along the thickness direction.
H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium
H01M 4/02 - Électrodes composées d'un ou comprenant un matériau actif
H01M 4/36 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs
H01M 10/0587 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure enroulés, c.-à-d. des électrodes positives enroulées, des électrodes négatives enroulées et des séparateurs enroulés
H01M 50/46 - Séparateurs, membranes ou diaphragmes caractérisés par leur combinaison avec des électrodes
H01M 50/489 - Séparateurs, membranes, diaphragmes ou éléments d’espacement dans les cellules caractérisés par leurs propriétés physiques, p. ex. degré de gonflement, hydrophilicité ou propriétés pour court-circuiter
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