CN116646467A - Lithium ion battery pole piece, winding core and lithium ion battery - Google Patents

Lithium ion battery pole piece, winding core and lithium ion battery Download PDF

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Publication number
CN116646467A
CN116646467A CN202310734365.6A CN202310734365A CN116646467A CN 116646467 A CN116646467 A CN 116646467A CN 202310734365 A CN202310734365 A CN 202310734365A CN 116646467 A CN116646467 A CN 116646467A
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pole piece
active material
accounts
lithium ion
ion battery
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CN116646467B (en
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邓伟
宋章训
梁听
胡学平
杨亦双
杨庆亨
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Zhongxing Pylon Battery Co Ltd
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Zhongxing Pylon Battery Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a lithium ion battery pole piece, a winding core and a lithium ion battery, which comprises a positive pole piece and a negative pole piece, wherein the active material of the surface A of the positive pole piece accounts for 96.7-98%, the particle size of the active material is 0.5-1.0 mu m, the active material of the surface B of the positive pole piece accounts for 94-96.5%, and the particle size of the active material is 0.5-1.5 mu m; the active material of the surface of the negative plate A accounts for 95-96.5%, the particle size of the active material is 5-15 mu m, the active material of the surface of the negative plate B accounts for 92-95.5%, and the particle size of the active material is 10-15 mu m. The invention solves the problems of inconsistent surface density, conductive network and bonding effect caused by inconsistent A, B surface curvature in the coiling process by improving the proportion of the active material on the surface of the battery pole piece A, B and the corresponding process, thereby prolonging the service life of the lithium ion battery; on the premise of the same service life of the battery, the surface density can be further increased on the basis of the surface density of the existing pole piece so as to improve the energy density of the battery.

Description

Lithium ion battery pole piece, winding core and lithium ion battery
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery pole piece, a winding core and a lithium ion battery.
Background
Along with the dual requirements of consumers on battery endurance mileage and service life, the development and development directions of lithium ion batteries gradually move towards high energy density and long circulation directions.
In the prior art, the design of the high-energy-density battery is divided into two types, one is innovation on the battery and battery pack structure, such as CTP and CTC type batteries; the other is to use high-capacity and high-compaction density materials on the cell design, and increase the pole piece surface density on the basis of the high-capacity and high-compaction density materials to improve the energy density of the single cell. Aiming at the prior art for improving the energy density of a single cell, the surface density and the compaction density of a pole piece are increased, the internal stress of the pole piece is increased, and particularly in a cylindrical winding cell, the phenomenon of an inner ring (A surface) and an outer ring (B surface) exists on two surfaces of the pole piece in the winding process, and because A, B surfaces are shared middle identical current collectors, the stress on the two surfaces of A, B is inconsistent due to the fact that the two surfaces of A, B are provided with curvature differences in the winding process and the charging and discharging process of the cell, so that the true surface density of the two surfaces is changed on the invisible one hand, and the contact effect and the bonding effect of active substances, conductive agents, adhesives and current collectors in the two surface material areas of the pole piece are changed on the other hand, so that the cycle life of a battery in the use process is influenced.
Therefore, how to make the two sides of the battery pole piece have the same surface density in the winding process is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a lithium ion battery pole piece, a winding core and a lithium ion battery, which can solve the problems of inconsistent surface density, conductive network and bonding effect caused by inconsistent A, B surface curvature in the winding process by improving the proportion of active substances on the surface of the battery pole piece A, B and the corresponding process, thereby prolonging the cycle life of the lithium ion battery in the use process; on the premise of the same service life of the battery, the surface density can be further increased on the basis of the surface density of the existing pole piece so as to improve the energy density of the battery.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
as a first aspect of the disclosure, a lithium ion battery pole piece is provided, which comprises a positive pole piece and a negative pole piece, wherein the active material of the surface A of the positive pole piece accounts for 96.7% -98%, the particle size of the active material is 0.5-1.0 μm, the active material of the surface B of the positive pole piece accounts for 94% -96.5%, and the particle size of the active material is 0.5-1.5 μm; the active material of the surface of the negative plate A accounts for 95-96.5%, the particle size of the active material is 5-15 mu m, the active material of the surface of the negative plate B accounts for 92-95.5%, and the particle size of the active material is 10-15 mu m.
As a second aspect of the present disclosure, a winding core is provided, which includes the above battery pole piece and the separator, where the a-plane of the positive pole piece corresponds to the B-plane of the negative pole piece, and the B-plane of the positive pole piece corresponds to the a-plane of the negative pole piece during winding.
As a third aspect of the present disclosure, a lithium ion battery is provided, where the winding core is put into a case, baked, injected with a liquid, and formed to obtain the lithium ion battery.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the active material characteristics of the surface of the pole piece A, B are changed, and the dynamic performance caused by the accumulation of pole piece materials is poor due to the larger curvature of the inner ring of the pole piece, so that the dynamic performance of the material can be improved by utilizing small particle materials on the surface A of the positive pole piece; the B surface of the positive plate is matched with the material in the coating area in the outer ring of the plate through designing the size particles so as to improve the phenomenon of contact variation among particles caused by stretching the material in the coating area, and the gram capacity design of the active material is used for solving the gram capacity difference in unit area caused by winding the plate so as to improve the N/P consistency of the battery and the same negative plate;
the invention changes the proportion of the pole piece A, B surface, especially the type and proportion of the conductive agent and the adhesive, the design principle is that the winding of the pole piece A surface (inner ring) is contracted, the materials in the auxiliary materials are accumulated, the active substances among the materials are closely contacted, so that the proportion of the conductive agent and the adhesive can be reduced to improve the content of the active substances, the surface density is reduced, the winding of the pole piece B surface (outer ring) is stretched, the active substances are loosely contacted, the proportion of the conductive agent and the adhesive is increased, and the surface density is increased. The design can not greatly change the electronic conductivity of the A, B surface of the pole piece and the bonding strength of the A, B surface, particularly the B surface, and the bonding property among particles is not deteriorated due to the stretching of a material area;
through the design, the problem of lithium precipitation caused by N/P change in the wound battery in the prior art can be solved, and the surface density can be further increased on the basis of the surface density of the existing pole piece on the premise that the service life of the battery is the same, so that the energy density of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention. Wherein:
fig. 1 is a schematic structural diagram of a lithium ion battery pole piece according to an embodiment of the present invention;
reference numerals: 1-A surface, 2-current collector and 3-B surface.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and examples.
Fig. 1 shows a schematic structural diagram of a lithium ion battery pole piece according to an embodiment of the invention, which comprises a positive pole piece and a negative pole piece, wherein an inner ring of the pole piece is an A surface 1, an outer ring of the pole piece is a B surface 3, and the same current collector 2 is shared, specifically, the active material of the A surface of the positive pole piece accounts for 96.7% -98%, the particle size of the active material is 0.5-1.0 μm, the active material of the B surface of the positive pole piece accounts for 94% -96.5%, and the particle size of the active material is 0.5-1.5 μm; the active material of the surface of the negative plate A accounts for 95-96.5%, the particle size of the active material is 5-15 mu m, the active material of the surface of the negative plate B accounts for 92-95.5%, and the particle size of the active material is 10-15 mu m.
In practical application, the dynamic performance of the battery pole piece is poor due to the fact that the curvature of the inner ring of the winding is large and pole piece materials are stacked, so that the active material with small particle size is selected for the surface A of the positive pole piece to improve the dynamic performance of the materials, and meanwhile, the surface B of the positive pole piece is matched with the active material with small particle size through the active material with large particle size to improve the phenomenon that the contact between particles is poor due to the fact that the outer ring is stretched in the winding. Specifically, the surface A of the positive plate consists of an active substance with small particle size of 0.5-1.0 mu m, the surface B of the positive plate consists of two particle sizes, the large particle size is 1-1.5 mu m, the ratio is 10% -40%, the small particle size is 0.5-1.2 mu m, and the ratio is 60% -90%.
Similarly, the active material of the surface A of the negative plate is petroleum coke, the graphitization degree is 90-95%, a coating form of soft carbon or hard carbon is adopted, a single-particle material is adopted, and the particle size is 5-15 mu m; the active material of the B surface of the negative plate comprises two raw materials of petroleum coke and needle coke, wherein the raw materials adopt a combination and collocation mode of primary particles and secondary particles, the primary particles account for 10% -40% and the secondary particles account for 60% -90%.
Further, in order to solve the difference of gram capacity in unit area caused by winding of the pole piece, N/P consistency of the battery can be provided through active material gram capacity design.
In the winding process, the positive plate A corresponds to the negative plate B, the positive plate B corresponds to the negative plate A, and the surface density and gram volume of active substances of the two surfaces in contact satisfy:
k3×σ3×c3=a1×k2×σ2×c2, a1 is a constant, and the value is 1.15 to 1.25
K4xσ4xc4=a2 (k1xσ1xc1), a2 is a constant, and the value is 1.08-1.16
Wherein a1 and a2 need to satisfy the following relationship: a1 The value χ=χa2, where χ is a constant, the value χ=1.01-1.10, K1 is the negative plate a-side active material ratio, σ1 is the negative plate a-side surface density, C1 is the negative plate a-side active material gram capacity, K2 is the negative plate B-side active material ratio, σ2 is the negative plate B-side surface density, C2 is the negative plate B-side active material gram capacity, K3 is the positive plate a-side active material ratio, σ3 is the positive plate a-side surface density, C3 is the positive plate a-side active material gram capacity, K4 is the positive plate B-side surface active material ratio, σ4 is the positive plate B-side surface density, and C4 is the positive plate B-side active material gram capacity.
According to one embodiment of the invention, the gram capacity of the active material of the positive plate A is 155-158mAh/g, the gram capacity of the active material of the negative plate B is 159-162mAh/g, the gram capacity of the active material of the negative plate A is 340-345mAh/g, and the gram capacity of the active material of the negative plate B is 345-355mAh/g.
In practical application, the surface A of the pole piece, namely the inner ring, is contracted due to winding, and materials in auxiliary materials are accumulated, so that active substances are closely contacted, the proportion of the conductive agent and the adhesive can be reduced to improve the content of the active substances, and the surface density is reduced. The B-side of the pole piece, i.e., the outer ring, is stretched by winding, and the adhesiveness between the particles is deteriorated by the stretching, so that it is necessary to increase the ratio of the conductive agent to the binder, i.e., the content of the active material is decreased, and the areal density is increased.
Specifically, the active material of the surface A of the positive plate accounts for 96.7% -98%, the conductive agent accounts for 1.0% -1.5%, the binder accounts for 1.0% -1.8%, the active material of the surface B of the positive plate accounts for 94% -96.5%, the conductive agent accounts for 1.5% -3.0%, and the binder accounts for 2.0% -3.0%.
The active material of the surface A of the negative plate accounts for 95% -96.5%, the conductive agent accounts for 0.5% -1%, the binder accounts for 3.0% -4.0%, the active material of the surface B of the negative plate accounts for 92% -95.5%, the conductive agent accounts for 1% -2%, and the binder accounts for 3.5% -6%.
It can be seen that the active material ratio in the face A of the pole piece is higher than the active material ratio in the face B of the pole piece, whether the pole piece is a positive pole piece or a negative pole piece, so that the surface density of the two faces of the pole piece is changed.
The content of the conductive agent in the surface B of the pole piece is higher than that in the surface A of the pole piece, two types of conductive agents are adopted in the surface B, the SP accounts for 10% -30% and the CNT accounts for 70% -90%. SP is selected as the conductive agent of the surface A of the pole piece.
The content of the binder in the surface B of the pole piece is higher than that of the binder in the surface A of the pole piece, wherein the binder in the surface A of the negative pole piece consists of two types, the CMC accounts for 30% -50%, the SBR accounts for 50% -70%, the binder CMC accounts for 10% -60% and the PAA accounts for 40% -90%. PVDF is selected as the binder of the A side and the B side of the positive plate.
By adjusting the contents of the active material, the conductive agent and the binder in the material area, the contact effect and the binding effect of the active material and the current collector can be changed, so that the service life of the lithium ion battery is prolonged.
The battery pole piece of the invention is coated with the B surface of the pole piece firstly and then with the A surface of the pole piece, wherein the A surface of the pole piece is an inner ring during winding, and the B surface of the pole piece is an outer ring during winding.
The invention further discloses a winding core, which comprises a diaphragm and the lithium ion battery pole piece, wherein in the winding process, the A surface of the positive pole piece corresponds to the B surface of the negative pole piece, the B surface of the positive pole piece corresponds to the A surface of the negative pole piece, and then the lithium ion battery is obtained after the steps of shell entering, baking, liquid injection and formation. The cycle life of the battery is prolonged by adjusting the proportion of active substances, conductive agents and binders on both sides of the battery pole piece and the particle size of active substance particles, so that the curvature difference in the winding process and the charging and discharging process of the battery core is solved.
The present invention will be described in further detail with reference to specific comparative examples and examples.
Comparative example
A battery pole piece comprises the same material proportion in each dressing of a current collector on the A side and a current collector on the B side, for example, 97.5% of active material proportion, 0.5% of conductive agent proportion and 2% of adhesive agent proportion.
And laminating the positive plate, the negative plate and the diaphragm to obtain a winding core, and putting the winding core into a shell, baking, injecting liquid and forming to obtain the lithium ion battery.
Example 1
The battery pole piece comprises 96.7% of positive pole piece A surface active substance, 1.5% of conductive agent, 1.8% of binder, 94% of B surface active substance, 3% of conductive agent and 3% of binder; the negative plate A has 95% of active material, 1% of conductive agent, 4% of binder, 92% of active material, 2% of conductive agent and 6% of binder.
The particle size of the active material in the surface A of the positive plate is 0.5 mu m, and the gram capacity of the active material is 155mAh/g; the particle size of the small-sized active material in the surface B is 0.5 mu m, the proportion is 60%, the particle size of the large-sized active material is 1 mu m, the proportion is 40%, and the gram capacity of the active material is 159mAh/g.
The particle size of the active material in the surface A of the negative plate is 5 mu m, and the gram capacity of the active material is 340mAh/g; the particle size of the active material in the B surface is 10 μm. The gram capacity of active substance is 345mAh/g.
The adhesive CMC of the A surface of the negative plate accounts for 30 percent, and the SBR accounts for 70 percent; the adhesive CMC of the B surface of the negative plate accounts for 10 percent and the PAA accounts for 90 percent. 10% of the positive plate B surface conductive agent SP and 90% of the CNT; the B-side conductive agent SP of the negative plate accounts for 10 percent and the CNT accounts for 90 percent.
And laminating the positive plate, the negative plate and the diaphragm to obtain a winding core, and putting the winding core into a shell, baking, injecting liquid and forming to obtain the lithium ion battery.
Example 2
A surface active material of the positive plate accounts for 97 percent, a conductive agent accounts for 1.4 percent, a binder accounts for 1.6 percent, a B surface active material accounts for 95 percent, a conductive agent accounts for 2.5 percent and a binder accounts for 2.5 percent; 96% of active material on the surface of the negative plate A, 0.8% of conductive agent, 3.2% of binder, 94% of active material on the surface of the negative plate B, 1.5% of conductive agent and 4.5% of binder.
The particle size of the active material in the surface A of the positive plate is 0.8 mu m, and the gram capacity of the active material is 156mAh/g; the particle size of the small-sized active substance in the surface B is 1 mu m, the proportion is 80%, the particle size of the large-sized active substance is 1.4 mu m, the proportion is 20%, and the gram capacity of the active substance is 160mAh/g.
The particle size of the active material in the surface A of the negative plate is 10 mu m, and the gram capacity of the active material is 342mAh/g; the particle size of the active material in the B surface is 12 μm. The gram capacity of the active substance is 350mAh/g.
And laminating the positive plate, the negative plate and the diaphragm to obtain a winding core, and putting the winding core into a shell, baking, injecting liquid and forming to obtain the lithium ion battery.
Example 3
The battery pole piece comprises 98% of active material of the surface A of the positive pole piece, 1% of conductive agent, 1% of binder, 96.5% of active material of the surface B, 1.5% of conductive agent and 2% of binder; 96.5% of active material on the surface of the negative plate A, 0.5% of conductive agent, 3% of binder, 95.5% of active material on the surface of the negative plate B, 1% of conductive agent and 3.5% of binder.
The particle size of the active material in the surface A of the positive plate is 1 mu m, and the gram capacity of the active material is 158mAh/g; the particle size of the small-sized active substance in the surface B is 1.2 mu m, the proportion is 90%, the particle size of the large-sized active substance is 1.5 mu m, the proportion is 10%, and the gram capacity of the active substance is 162mAh/g.
The particle size of the active material in the surface A of the negative plate is 15 mu m, and the gram capacity of the active material is 345mAh/g; the particle size of the active material in the B surface is 15 μm. The gram capacity of the active substance is 355mAh/g.
And laminating the positive plate, the negative plate and the diaphragm to obtain a winding core, and putting the winding core into a shell, baking, injecting liquid and forming to obtain the lithium ion battery.
Example 4
The present example is substantially the same as example 1, except that the negative plate a side binder CMC accounts for 50% and SBR accounts for 50%; the adhesive CMC of the B surface of the negative plate accounts for 50 percent and the PAA accounts for 50 percent. The B-side conductive agent SP of the positive plate accounts for 20 percent and the CNT accounts for 80 percent; the B-side conductive agent SP of the negative plate accounts for 20 percent and the CNT accounts for 80 percent.
Example 5
This example is substantially the same as example 1, except that the negative plate a side binder CMC accounts for 40% and SBR accounts for 60%; the adhesive CMC of the B surface of the negative plate accounts for 60 percent and the PAA accounts for 40 percent. 30% of the positive plate B-side conductive agent SP and 70% of the CNT; the proportion of the conductive agent SP on the B surface of the negative plate is 30%, and the proportion of the CNT is 70%.
Test experiment 1
In the performance test process, the lithium ion batteries prepared in the examples and the comparative examples are selected for electrochemical performance test.
The test results of each example and comparative example are shown in table 1:
as can be seen from table 1, by different designs of the surfaces of the positive and negative plates A, B, the cycle life of the battery can be significantly improved, the lithium precipitation risk of the battery can be reduced, and the energy efficiency of the battery in the later stage of cycle use can be improved.
Test experiment 2
The same cell size 4680 cells were designed, wherein the structural design of the cells in the six groups of examples were the same, the cycle life of the cells was 3000 weeks capacity retention was 83%, and the actual energy density of the cells is shown in table 2:
comparative example Example 1 Example 2 Example 3 Example 4 Example 5
120Wh/kg 128Wh/kg 126Wh/kg 125Wh/kg 127Wh/kg 127Wh/kg
As can be seen from table 2, on the lithium ion battery with the same size and the same structural design, the design of each component of the face of the pole piece A, B is adjusted to improve the surface density of the pole piece in the battery, and the energy density of the battery can be obviously improved on the premise of ensuring the service life of the battery.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (12)

1. The lithium ion battery pole piece comprises a positive pole piece and a negative pole piece, and is characterized in that the active material of the surface A of the positive pole piece accounts for 96.7% -98%, the particle size of active material particles is 0.5-1.0 mu m, the active material of the surface B of the positive pole piece accounts for 94% -96.5%, and the particle size of the active material particles is 0.5-1.5 mu m; the active material of the surface A of the negative plate accounts for 95-96.5%, the particle size of the active material particles is 5-15 mu m, the active material of the surface B of the negative plate accounts for 92-95.5%, and the particle size of the active material particles is 10-15 mu m.
2. The lithium-ion battery pole piece according to claim 1, wherein in the winding process, the positive pole piece a corresponds to the negative pole piece B, the positive pole piece B corresponds to the negative pole piece a, and the surface density and gram capacity of the active material of the two contact surfaces satisfy:
k3×σ3×c3=a1×k2×σ2×c2, a1 is a constant, and the value is 1.15 to 1.25
K4xσ4xc4=a2 (k1xσ1xc1), a2 is a constant, and the value is 1.08-1.16
Wherein a1=χa2, χ is a constant, the value is 1.01-1.10, K1 is the negative plate a surface active material ratio, σ1 is the negative plate a surface density, C1 is the negative plate a surface active material gram capacity, K2 is the negative plate B surface active material ratio, σ2 is the negative plate B surface density, C2 is the negative plate B surface active material gram capacity, K3 is the positive plate a surface active material ratio, σ3 is the positive plate a surface density, C3 is the positive plate a surface active material gram capacity, K4 is the positive plate B surface active material ratio, σ4 is the positive plate B surface active material gram capacity, and C4 is the positive plate B surface active material gram capacity.
3. The lithium ion battery pole piece of claim 2, wherein the positive pole piece has a gram volume of a surface active material of 155-158mAh/g, a gram volume of a surface active material of 159-162mAh/g, a gram volume of a negative pole piece a surface active material of 340-345mAh/g, and a gram volume of a surface active material of 345-355mAh/g.
4. The lithium ion battery pole piece according to claim 1, wherein the active material in the B surface of the positive pole piece consists of two particle sizes, wherein the particle size of large particles is 1-1.5 μm, the ratio is 10% -40%, the particle size of small particles is 0.5-1.2 μm, and the ratio is 60% -90%.
5. The lithium ion battery pole piece according to claim 1 or 4, wherein the active material of the B surface of the negative pole piece comprises petroleum coke and needle coke, the primary particle accounts for 10% -40%, and the secondary particle accounts for 60% -90%.
6. The lithium ion battery pole piece according to claim 5, wherein the active material of the surface A of the negative pole piece is petroleum coke, the graphitization degree is 90% -95%, and the active material is coated in a soft carbon or hard carbon mode.
7. The lithium ion battery pole piece according to claim 1, wherein the conductive agent of the positive pole piece A face accounts for 1.0% -1.5%, the binder accounts for 1.0% -1.8%, the conductive agent of the positive pole piece B face accounts for 1.5% -3.0%, and the binder accounts for 2.0% -3.0%.
8. The lithium ion battery pole piece according to claim 1 or 7, wherein the conductive agent of the negative pole piece A face accounts for 0.5% -1%, the binder accounts for 3.0% -4.0%, the conductive agent of the negative pole piece B face accounts for 1% -2%, and the binder accounts for 3.5% -6%.
9. The lithium ion battery pole piece of claim 8, wherein the conductive agent SP in the positive pole piece B face and the negative pole piece B face is 10% -30% and the CNT is 70% -90%.
10. The lithium ion battery pole piece of claim 8, wherein the binder CMC in the negative pole piece a-side is 30% -50%, the SBR is 50% -70%, the binder CMC in the negative pole piece B-side is 10% -60%, and the PAA is 40% -90%.
11. A winding core comprising a diaphragm and the battery pole piece of any one of claims 1-10, wherein in the winding process, the a face of the positive pole piece corresponds to the B face of the negative pole piece, and the B face of the positive pole piece corresponds to the a face of the negative pole piece.
12. A lithium ion battery, which is obtained by putting a winding core into a shell, baking, injecting liquid and forming, characterized in that the winding core is the winding core of claim 11.
CN202310734365.6A 2023-06-20 2023-06-20 Lithium ion battery pole piece, winding core and lithium ion battery Active CN116646467B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120258343A1 (en) * 2009-12-17 2012-10-11 Koji Takahata Lithium secondary battery
CN114242936A (en) * 2021-12-16 2022-03-25 珠海冠宇电池股份有限公司 Electrode assembly and application thereof
CN115588730A (en) * 2022-10-28 2023-01-10 深圳市比克动力电池有限公司 Positive plate, preparation method thereof and battery comprising positive plate
CN219123291U (en) * 2022-09-15 2023-06-02 珠海冠宇电池股份有限公司 Roll up core structure and battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120258343A1 (en) * 2009-12-17 2012-10-11 Koji Takahata Lithium secondary battery
CN114242936A (en) * 2021-12-16 2022-03-25 珠海冠宇电池股份有限公司 Electrode assembly and application thereof
CN219123291U (en) * 2022-09-15 2023-06-02 珠海冠宇电池股份有限公司 Roll up core structure and battery
CN115588730A (en) * 2022-10-28 2023-01-10 深圳市比克动力电池有限公司 Positive plate, preparation method thereof and battery comprising positive plate

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