CN112038610A - Preparation method of composite cathode for lithium ion battery - Google Patents
Preparation method of composite cathode for lithium ion battery Download PDFInfo
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
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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
- 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
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- 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
Abstract
The invention provides a preparation method of a composite negative electrode of a lithium ion battery, wherein the negative electrode comprises a current collector and a negative electrode active material layer positioned on the current collector, the negative electrode active material comprises silicon particles and graphite particles, the preparation method comprises the steps of providing the silicon particles, the D50 of the silicon particles is 0.9-1.1 micrometer, the D50 of the first graphite particles is 100-200 nanometers, and the D50 of the second graphite particles is 1.6-1.8 micrometers; the third graphite particles have a D50 of 6-8 microns; mixing the silicon particles and the first graphite particles according to a preset mass ratio, placing the mixture in a ball mill, carrying out high-speed ball milling to obtain a silicon/graphite composite material, then mixing the first graphite particles and the second graphite particles according to a preset mass ratio to obtain a second slurry, sequentially coating the first slurry and the second slurry on a current collector, and drying to obtain a negative electrode active material layer. The negative electrode has high energy density and high cycle performance.
Description
Technical Field
The invention relates to a preparation method of a composite cathode for a lithium ion battery.
Background
Lithium ion batteries are considered to be a new type of power source that meets the increasing energy demands of portable electronic devices, electric and hybrid vehicles. Lithium ion batteries have been used in numerous civil and military applications, such as mobile phones, notebook computers, video cameras, digital cameras, and the like. The lithium ion battery has the following characteristics: high voltage, high capacity, low consumption, no memory effect, no public hazard, small volume, small internal resistance, less self-discharge and more cycle times. The silicon-carbon cathode is used as a common cathode of a future lithium ion battery, has high energy density, low cost and good charge-discharge rate performance, but can cause large volume change of a cathode active layer due to the volume change effect of silicon particles, and can cause the falling of active substances of the active substance layer in the charge-discharge process to cause the attenuation of cycle capacity.
Disclosure of Invention
The invention provides a preparation method of a composite negative electrode for a lithium ion battery, wherein the negative electrode comprises a current collector and an active substance layer positioned on the current collector, and the active substance layer comprises a first active substance and a second active substance; the first active substance has a D50 of 2.4-2.5 microns, a D10 of 1.8-1.9 microns, and a D90 of 3.2-3.3 microns; the second active substance has D50 of 1.9-2.0 micrometer, D10 of 1.0-1.1 micrometer, and D90 of 2.4-2.5 micrometer; the preparation method comprises the steps of mixing a first active substance and a second active substance according to a ratio of 7:3-8:2 and preparing a first slurry; mixing the first active material and the second active material according to a predetermined mass ratio and preparing a second slurry, wherein the mass ratio of the first active material/the second active material/the first active material D50/the first active material D50 is 0.66-0.67, and k is 0.45-0.46; the preparation method comprises the steps of mixing a first active substance and a conductive agent according to the mass ratio of 1:9-2:8, preparing conductive slurry, sequentially coating and drying the conductive slurry, the first slurry and the second slurry, and carrying out hot pressing to obtain the lithium ion battery composite negative electrode.
The specific scheme is as follows:
a method of preparing a composite anode for a lithium ion battery, the anode comprising a current collector and an anode active material layer on the current collector, the anode active material comprising silicon particles and graphite particles, the method comprising:
1) providing silicon particles having a D50 of 0.9 to 1.1 microns, a D10 of 0.4 to 0.5 microns, and a D90 of 1.6 to 1.7 microns;
2) providing first graphite particles, second graphite particles and third graphite particles, wherein D50 of the first graphite particles is 100-200 nanometers, D50 of the second graphite particles is 1.6-1.8 micrometers, D10 is 0.9-1.1 micrometers, and D90 is 2.8-3.0 micrometers; the third graphite particles have a D50 of 6-8 microns, a D10 of 2-3 microns, and a D90 of 10-12 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, wherein the mass ratio of the silicon particles to the first graphite particles is D50 of the silicon particles/D50 of the first graphite particles, wherein m is 0.75-0.77, placing the mixture into a ball mill, and carrying out high-speed ball milling to obtain a silicon/graphite composite material;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: 45-47:34-36:13-15:3-5:2-4 of a conductive agent;
5) mixing the first graphite particles and the second graphite particles according to a predetermined mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is k, the first graphite particles to the second graphite particles is D50, the second graphite particles to the second graphite particles is D50, and k is 1.34-1.36, so as to prepare a second slurry;
6) and sequentially coating the first slurry and the second slurry on a current collector, and drying to obtain a negative active material layer.
Further, the high-speed ball milling is carried out at the rotating speed of 300-500 r/min for 10-20 hours.
Further, the silicon particles had a D50 of 1.0 micron, a D10 of 0.5 micron, and a D90 of 1.6 micron.
Further, the second graphite particles had a D50 of 1.7 microns, a D10 of 1.0 microns, and a D90 of 2.9 microns.
Further, the third graphite particles had a D50 of 7 microns, a D10 of 2.5 microns, and a D90 of 11 microns.
Further, in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: conductive agent 46:35:14:4:3
Further, in the second slurry, the ratio of active material: adhesive: the conductive agent is 100:4: 5. .
Further, the coating thickness of the first paste and the second paste, the thickness of the first paste: the thickness of the second slurry was 55-65: 15-25.
The invention has the following beneficial effects:
1) the silicon-carbon composite cathode has higher energy density, the silicon and the first graphite particles can form a composite material through high-speed ball milling, and the first graphite particles are coated on the surface of the silicon particles, so that the volume expansion phenomenon of the silicon particles is effectively relieved;
2) and the inventors found that when the silicon particles/first graphite particles satisfy a predetermined mass ratio, i.e., m x D50 of the silicon particles/D50 of the first graphite particles, where m is 0.75 to 0.77, the coating effect of graphite is the best and the cycle performance of the electrode is the highest.
3) The first layer of slurry is used as the highest energy density layer, silicon particles and graphite particles with different particle sizes are compounded, wherein the second graphite particles and the composite particles can form a stable material layer, and the third graphite particles with large particle sizes are embedded in the first layer of slurry, so that the function of a conductive bridge can be played in the layer, and the energy density and the rate capability of the layer can be improved.
4) The surface of the first slurry layer is covered with the stabilizing layer only containing the first graphite particles and the second graphite particles, so that the volume expansion of the first slurry layer can be relieved, the second slurry layer does not contain the third graphite particles, a more compact layer structure can be achieved after hot pressing, the cycle performance of the negative electrode is improved, and when the first graphite particles/the second graphite particles meet a preset mass ratio, namely k is the first graphite particles D50/the second graphite particles D50, and k is 1.34-1.36, the second slurry can obtain extremely high mixing uniformity, the slurry is close to a rheological phase, and the coating layer of the second slurry has extremely high structural stability and the cycle life is prolonged.
Detailed Description
The present invention will be described in more detail below with reference to specific examples, but the scope of the present invention is not limited to these examples.
Example 1
1) Providing silicon particles having a D50 of 0.9 microns, a D10 of 0.4 microns, and a D90 of 1.6 microns;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 100 nanometers, the second graphite particle having a D50 of 1.6 microns, a D10 of 0.9 microns, and a D90 of 2.8 microns; the third graphite particles have a D50 of 6 microns, a D10 of 2 microns, and a D90 of 10 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, wherein the mass ratio of the silicon particles to the first graphite particles is 6.75, placing the mixture in a ball mill, and carrying out high-speed ball milling at the rotating speed of 300 revolutions per minute for 10 hours to obtain a silicon/graphite composite material;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 45:34:13:3: 2;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.084, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 55:25, thereby obtaining a negative electrode active material layer.
Example 2
1) Providing silicon particles having a D50 of 1.1 microns, a D10 of 0.5 microns, and a D90 of 1.7 microns;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 200 nanometers, the second graphite particle having a D50 of 1.8 micrometers, a D10 of 1.1 micrometers, a D90 of 3.0 micrometers; the third graphite particles have a D50 of 8 microns, a D10 of 3 microns, and a D90 of 12 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, wherein the mass ratio of the silicon particles to the first graphite particles is 4.24, placing the mixture in a ball mill, and carrying out high-speed ball milling at the rotating speed of 500 revolutions per minute for 20 hours to obtain a silicon/graphite composite material;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 47:36:15:5: 4;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.151, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 65:15, thereby obtaining a negative electrode active material layer.
Example 3
1) Providing silicon particles having a D50 of 1 micron, a D10 of 0.45 micron, and a D90 of 1.65 micron;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 150 nanometers, the second graphite particle having a D50 of 1.7 microns, a D10 of 1 micron, and a D90 of 2.9 microns; the third graphite particles have a D50 of 7 microns, a D10 of 2.5 microns, and a D90 of 11 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, wherein the mass ratio of the silicon particles to the first graphite particles is 5.07, placing the mixture in a ball mill, and carrying out high-speed ball milling at the rotating speed of 400 revolutions per minute for 15 hours to obtain a silicon/graphite composite material;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 46:35:14:4: 3;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.119, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 60:20, thereby obtaining a negative electrode active material layer.
Comparative example 1
1) Providing silicon particles having a D50 of 1 micron, a D10 of 0.45 micron, and a D90 of 1.65 micron;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 150 nanometers, the second graphite particle having a D50 of 1.7 microns, a D10 of 1 micron, and a D90 of 2.9 microns; the third graphite particles have a D50 of 7 microns, a D10 of 2.5 microns, and a D90 of 11 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, placing the mixture into a ball mill, and carrying out high-speed ball milling on the mixture to obtain a silicon/graphite composite material, wherein the mass ratio of the silicon particles to the first graphite particles is 4, the high-speed ball milling is carried out at the rotating speed of 400 revolutions per minute, and the ball milling time is 15 hours;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 46:35:14:4: 3;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.06, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 60:20, thereby obtaining a negative electrode active material layer.
Comparative example 2
1) Providing silicon particles having a D50 of 1 micron, a D10 of 0.45 micron, and a D90 of 1.65 micron;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 150 nanometers, the second graphite particle having a D50 of 1.7 microns, a D10 of 1 micron, and a D90 of 2.9 microns; the third graphite particles have a D50 of 7 microns, a D10 of 2.5 microns, and a D90 of 11 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, placing the mixture into a ball mill, and carrying out high-speed ball milling on the mixture to obtain a silicon/graphite composite material, wherein the mass ratio of the silicon particles to the first graphite particles is 7, the high-speed ball milling is carried out at the rotating speed of 400 revolutions per minute, and the ball milling time is 15 hours;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 46:35:14:4: 3;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.2, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 60:20, thereby obtaining a negative electrode active material layer.
Comparative example 3
1) Providing silicon particles having a D50 of 1 micron, a D10 of 0.45 micron, and a D90 of 1.65 micron;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 150 nanometers, the second graphite particle having a D50 of 1.7 microns, a D10 of 0.5 microns, and a D90 of 4 microns; the third graphite particles have a D50 of 7 microns, a D10 of 1 micron, and a D90 of 15 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, wherein the mass ratio of the silicon particles to the first graphite particles is 5.07, placing the mixture in a ball mill, and carrying out high-speed ball milling at the rotating speed of 400 revolutions per minute for 15 hours to obtain a silicon/graphite composite material;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 46:35:14:4: 3;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.119, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 60:20, thereby obtaining a negative electrode active material layer.
Comparative example 4
1) Providing silicon particles having a D50 of 1 micron, a D10 of 0.3 micron, and a D90 of 2 microns;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 150 nanometers, the second graphite particle having a D50 of 1.7 microns, a D10 of 0.6 microns, and a D90 of 3 microns; the third graphite particles have a D50 of 7 microns, a D10 of 3 microns, and a D90 of 8 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, wherein the mass ratio of the silicon particles to the first graphite particles is 5.07, placing the mixture in a ball mill, and carrying out high-speed ball milling at the rotating speed of 400 revolutions per minute for 15 hours to obtain a silicon/graphite composite material;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 46:35:14:4: 3;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.119, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 60:20, thereby obtaining a negative electrode active material layer.
Comparative example 5
1) Providing silicon particles having a D50 of 2 microns, a D10 of 0.45 microns, and a D90 of 1.65 microns;
2) providing first, second and third graphite particles, the first graphite particle having a D50 of 300 nanometers, the second graphite particle having a D50 of 2 microns, a D10 of 1 micron, and a D90 of 2.9 microns; the third graphite particles have a D50 of 5 microns, a D10 of 2.5 microns, and a D90 of 11 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, placing the mixture into a ball mill, and carrying out high-speed ball milling on the mixture to obtain a silicon/graphite composite material, wherein the mass ratio of the silicon particles to the first graphite particles is 7, the high-speed ball milling is carried out at the rotating speed of 400 revolutions per minute, and the ball milling time is 15 hours;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent is 46:35:14:4: 3;
5) mixing the first graphite particles and the second graphite particles according to a preset mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is 0.06, and preparing a second slurry;
6) coating the first slurry and the second slurry on a current collector in sequence, wherein the coating thickness of the first slurry and the second slurry is as follows: the second slurry was dried to a thickness of 60:20, thereby obtaining a negative electrode active material layer.
Test and results
The first and second slurries of examples 1 to 3 and comparative examples 1 to 5 were tested for stability, the slurries were stored at normal temperature for 24 hours, the solid content at 5cm below the surface of the slurries before and after storage was measured, and the solid content after storage/the solid content before storage was calculated to obtain the stability retention rate, and the negative electrodes of examples 1 to 3 and comparative examples 1 to 5 were combined with lithium sheets to constitute experimental batteries, and the cycle was repeated 500 times to measure the capacity retention rate of the negative electrode, and the results are shown in table 1. As can be seen from table 1, the ratio of the particle size and the content of each component has a great influence on the stability of the slurry and the capacity retention rate.
TABLE 1
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.
Claims (8)
1. A method of preparing a composite anode for a lithium ion battery, the anode comprising a current collector and an anode active material layer on the current collector, the anode active material comprising silicon particles and graphite particles, the method comprising:
1) providing silicon particles having a D50 of 0.9 to 1.1 microns, a D10 of 0.4 to 0.5 microns, and a D90 of 1.6 to 1.7 microns;
2) providing first graphite particles, second graphite particles and third graphite particles, wherein D50 of the first graphite particles is 100-200 nanometers, D50 of the second graphite particles is 1.6-1.8 micrometers, D10 is 0.9-1.1 micrometers, and D90 is 2.8-3.0 micrometers; the third graphite particles have a D50 of 6-8 microns, a D10 of 2-3 microns, and a D90 of 10-12 microns;
3) mixing silicon particles and first graphite particles according to a preset mass ratio, wherein the mass ratio of the silicon particles to the first graphite particles is D50 of the silicon particles/D50 of the first graphite particles, wherein m is 0.75-0.77, placing the mixture into a ball mill, and carrying out high-speed ball milling to obtain a silicon/graphite composite material;
4) mixing the composite material, the second graphite particles and the third graphite particles according to a preset mass ratio to prepare a first slurry, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: 45-47:34-36:13-15:3-5:2-4 of a conductive agent;
5) mixing the first graphite particles and the second graphite particles according to a predetermined mass ratio, wherein the mass ratio of the first graphite particles to the second graphite particles is k, the first graphite particles to the second graphite particles is D50, the second graphite particles to the second graphite particles is D50, and k is 1.34-1.36, so as to prepare a second slurry;
6) and sequentially coating the first slurry and the second slurry on a current collector, and drying to obtain a negative active material layer.
2. The method as claimed in the preceding claim, wherein the high-speed ball milling is performed at a rotation speed of 300-.
3. The method of the preceding claim, the silicon particles having a D50 of 1.0 micron, a D10 of 0.5 micron, and a D90 of 1.6 micron.
4. The method of the preceding claim, the second graphite particles having a D50 of 1.7 microns, a D10 of 1.0 microns, and a D90 of 2.9 microns.
5. The method of the preceding claim, the third graphite particles having a D50 of 7 microns, a D10 of 2.5 microns, and a D90 of 11 microns.
6. The method of the preceding claim, wherein in the first slurry, the composite material: second graphite particles: third graphite particles: adhesive: the conductive agent 46:35:14:4: 3.
7. The method of the preceding claim, wherein, in the second slurry, the ratio of active material: adhesive: the conductive agent is 100:4: 5.
8. The method of the preceding claim, wherein the first and second slurries are applied at a thickness, the thickness of the first slurry: the thickness of the second slurry was 55-65: 15-25.
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| CN112635712A (en) * | 2020-12-17 | 2021-04-09 | 珠海冠宇电池股份有限公司 | Negative plate and lithium ion battery |
| CN113078293A (en) * | 2021-03-24 | 2021-07-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN113130869A (en) * | 2021-04-09 | 2021-07-16 | 珠海冠宇电池股份有限公司 | Negative plate and lithium ion battery |
| US20210273224A1 (en) * | 2018-07-11 | 2021-09-02 | Showa Denko Materials Co., Ltd. | Negative electrode material for lithium-ion secondary battery, negative electrode for lithium-ion secondary battery, lithium-ion secondary battery and method of producing negative electrode for lithium-ion secondary battery |
| CN113488637A (en) * | 2021-06-18 | 2021-10-08 | 东莞塔菲尔新能源科技有限公司 | Composite negative electrode material, negative plate and lithium ion battery |
| CN114709367A (en) * | 2022-04-07 | 2022-07-05 | 珠海冠宇电池股份有限公司 | Negative plate, lithium ion battery and preparation method of negative plate |
| EP4057383A3 (en) * | 2021-03-10 | 2023-01-04 | Prime Planet Energy & Solutions, Inc. | Method of producing non-aqueous electrolyte secondary battery, and negative electrode active material |
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Cited By (9)
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| US20210273224A1 (en) * | 2018-07-11 | 2021-09-02 | Showa Denko Materials Co., Ltd. | Negative electrode material for lithium-ion secondary battery, negative electrode for lithium-ion secondary battery, lithium-ion secondary battery and method of producing negative electrode for lithium-ion secondary battery |
| CN112635712A (en) * | 2020-12-17 | 2021-04-09 | 珠海冠宇电池股份有限公司 | Negative plate and lithium ion battery |
| CN112436104A (en) * | 2020-12-30 | 2021-03-02 | 兰溪致德新能源材料有限公司 | Negative pole piece and preparation method thereof |
| CN112436104B (en) * | 2020-12-30 | 2022-09-06 | 兰溪致德新能源材料有限公司 | Negative pole piece and preparation method thereof |
| EP4057383A3 (en) * | 2021-03-10 | 2023-01-04 | Prime Planet Energy & Solutions, Inc. | Method of producing non-aqueous electrolyte secondary battery, and negative electrode active material |
| CN113078293A (en) * | 2021-03-24 | 2021-07-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN113130869A (en) * | 2021-04-09 | 2021-07-16 | 珠海冠宇电池股份有限公司 | Negative plate and lithium ion battery |
| CN113488637A (en) * | 2021-06-18 | 2021-10-08 | 东莞塔菲尔新能源科技有限公司 | Composite negative electrode material, negative plate and lithium ion battery |
| CN114709367A (en) * | 2022-04-07 | 2022-07-05 | 珠海冠宇电池股份有限公司 | Negative plate, lithium ion battery and preparation method of negative plate |
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