CN110707306B - Preparation method of silicon-carbon cathode for lithium ion battery - Google Patents
Preparation method of silicon-carbon cathode for lithium ion battery Download PDFInfo
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- CN110707306B CN110707306B CN201910994109.4A CN201910994109A CN110707306B CN 110707306 B CN110707306 B CN 110707306B CN 201910994109 A CN201910994109 A CN 201910994109A CN 110707306 B CN110707306 B CN 110707306B
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- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 107
- 239000002153 silicon-carbon composite material Substances 0.000 claims abstract description 50
- 229910021382 natural graphite Inorganic materials 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 32
- 238000007873 sieving Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 238000007731 hot pressing Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 239000011149 active material Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 8
- 239000006258 conductive agent Substances 0.000 claims description 8
- 239000002270 dispersing agent Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000007770 graphite material Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 22
- 229910002804 graphite Inorganic materials 0.000 abstract description 7
- 239000010439 graphite Substances 0.000 abstract description 7
- 239000011229 interlayer Substances 0.000 abstract description 3
- 239000002033 PVDF binder Substances 0.000 description 14
- 239000006230 acetylene black Substances 0.000 description 14
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 14
- 239000013543 active substance Substances 0.000 description 13
- 239000006255 coating slurry Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011889 copper foil Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000002210 silicon-based material Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910021483 silicon-carbon alloy Inorganic materials 0.000 description 1
Classifications
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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
-
- 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
- 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
-
- 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
-
- 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
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a preparation method of a silicon-carbon cathode for a lithium ion battery, which comprises the steps of sieving a silicon-carbon composite material, wherein the aperture of a sieve is the same as that of D90 of the silicon-carbon composite material, collecting a material on a sieve as a first material, and collecting a material below the sieve as a second material; then, natural graphite is sieved, a material below the sieve is collected to be used as a second material, and the second material is mixed with the second material of the silicon-carbon composite material according to a certain proportion; collecting the material under the screen as a first material, and sieving the first material again, wherein the mesh size of the first material is 2 times of D50 (graphite); collecting materials below the screen, mixing the materials according to a certain proportion to prepare slurry 2, then coating the slurry 2 on a current collector, drying the slurry to obtain a first mixed layer, then coating the slurry 1, drying the slurry to obtain a second mixed layer, and carrying out hot pressing to obtain the cathode. The cathode prepared by the invention has good rate capability, strong interlayer binding force and good cycle life.
Description
Technical Field
The invention relates to the technical field of lithium ion battery production, in particular to a preparation method of a silicon-carbon cathode for a lithium ion battery.
Background
Compared with the graphite cathode material, the silicon-based cathode material has obvious energy density advantage. The theoretical energy density of the silicon negative electrode exceeds 10 times, and is up to 4200 mAh/g. However, the electrical conductivity of silicon is much worse than that of graphite, which results in large irreversible degree in the lithium ion deintercalation process, and the direct effect thereof is also to deteriorate the cycle life of the battery, and carbon-coated silicon materials or carbon-silicon alloys are generally adopted in the field to improve the performance of the silicon materials. In recent years, a silicon-carbon composite material has become one of the mainstream of the negative electrode when mixed with natural graphite, and the performance of the negative electrode is improved by utilizing the high energy density of the silicon material and the mature process performance of the carbon material.
Disclosure of Invention
On the basis, the invention provides a preparation method of a silicon-carbon negative electrode for a lithium ion battery, wherein the silicon-carbon negative electrode comprises a silicon-carbon composite material and natural graphite, the average particle size D50 of the silicon-carbon composite material is 1-3 μm, the average particle size D90 of the silicon-carbon composite material is 5-6 μm, and the average particle size D50 of the natural graphite is 16-18 μm, the preparation method comprises the steps of sieving the silicon-carbon composite material, wherein the aperture of a sieve mesh is the same as that of the D90 of the silicon-carbon composite material, collecting a material on the sieve mesh as a first material, and collecting a material under the sieve mesh as a second material; then, natural graphite is sieved, the aperture of a sieve mesh is the same as that of D90 of the silicon-carbon composite material, a material below the sieve mesh is collected as a second material, and the second material is mixed with the second material of the silicon-carbon composite material according to a certain proportion to prepare slurry 1; the material on the screen was then collected and sieved again, with a mesh size of 1.5 times D50 (graphite); collecting the material under the screen as a first material, and collecting the material on the screen and sieving again, wherein the mesh opening is 2 times of D50 (graphite); collecting the material below the screen, mixing the material with the first material of the silicon-carbon composite material and the first material of the natural graphite according to a certain proportion to prepare slurry 2, then coating the slurry 2 on a current collector, drying to obtain a first mixed layer, then coating the slurry 1, drying to obtain a second mixed layer, and carrying out hot pressing to obtain the cathode. The cathode prepared by the invention has good rate capability, strong interlayer binding force and good cycle life.
The specific scheme is as follows:
a preparation method of a silicon-carbon negative electrode for a lithium ion battery, the silicon-carbon negative electrode comprises a silicon-carbon composite material and natural graphite, wherein the average particle size D50 of the silicon-carbon composite material is 1-3 μm, the average particle size D90 of the silicon-carbon composite material is 5-6 μm, and the average particle size D50 of the natural graphite is 16-18 μm, and the preparation method comprises the following steps:
1) sieving the silicon-carbon composite material, wherein the aperture of a sieve is the same as that of D90 of the silicon-carbon composite material, collecting the material on the sieve as a first material, and collecting the material under the sieve as a second material;
2) sieving natural graphite, wherein the aperture of a sieve mesh is the same as that of D90 of the silicon-carbon composite material, collecting a material below the sieve mesh as a second material, and mixing the material with the second material of the silicon-carbon composite material according to a certain proportion to prepare slurry 1;
3) the material on the screen was collected and sieved again, the mesh size being 1.5 times D50 (graphite); collecting the material under the screen as a first material;
4) collecting the material on the screen, sieving again, wherein the aperture of the screen is 2 times of that of D50 (graphite), collecting the material under the screen, and mixing the material with the first material of the silicon-carbon composite material and the first material of the natural graphite according to a certain proportion to prepare slurry 2;
5) coating the slurry 2 on the current collector, drying to obtain a first mixed layer, then coating the slurry 1, and drying to obtain a second mixed layer;
6) and hot-pressing the first mixed layer and the second mixed layer together to obtain the cathode.
Further, in the step 2, according to the mass ratio, the natural graphite: the silicon-carbon composite material is 100: 20-40.
Further, in the step 4, according to the mass ratio, the material below the screen: first carbon-silicon composite material: the first natural graphite material was 5-10:100: 15-30.
Further, in the step 2, the process of preparing the slurry 1 includes sequentially adding a dispersant, a conductive agent and a binder into a solvent, uniformly stirring, adding an active material, and uniformly stirring to obtain the slurry 1, wherein the active material: dispersing agent: conductive agent: the binder is 100:4-6:4-6: 6-7.
Further, in the step 4, the process of preparing the slurry 2 includes sequentially adding the dispersant, the conductive agent and the binder into the solvent, uniformly stirring, adding the active material, and uniformly stirring to obtain the slurry 2, wherein the active material: dispersing agent: conductive agent: the binder is 100:2-3:3-5: 3-5.
Further, the solvent is a mixed solution of water and ethanol, and the volume ratio of water: ethanol-10-8: 1.
Further, the thickness ratio of the first mixed layer to the second mixed layer is 5-10: 1.
A negative electrode characterized by being prepared by the method.
The invention has the following beneficial effects:
1) the inventor finds that the silicon-carbon material and natural graphite mixed negative electrode can maximize various performances of the material by performing structural treatment on the negative electrode active layer, and stacking the active materials with different particle sizes and different proportions at different positions;
2) determining the optimal particle size distribution range and the component proportion of each layer through numerous tests of the inventor;
3) and through multiple screening, the particle size distribution of the raw material is graded, so that the requirement on the initial property of the raw material is reduced.
4) The preparation method is simple to operate and low in cost, and the obtained cathode is good in rate capability, strong in interlayer bonding force and good in cycle life.
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. Wherein, the average particle diameter D50 of the silicon-carbon composite material is 2 μm, the average particle diameter D90 of the silicon-carbon composite material is 6 μm, the average particle diameter D50 of the natural graphite is 16 μm, the solvent is a mixed solution of water and ethanol, and the volume ratio of water: ethanol ═ 9:1
Example 1
1) Sieving the silicon-carbon composite material, wherein the aperture of a sieve is 6 mu m, collecting the material on the sieve as a first material, and collecting the material under the sieve as a second material;
2) sieving natural graphite with a sieve mesh aperture of 6 μm, collecting the material under the sieve as a second material, according to the natural graphite: mixing the silicon-carbon composite material with a second material of the silicon-carbon composite material in a ratio of 100:20, adding CMC, acetylene black and PVDF into a solvent in sequence, adding an active substance after uniformly stirring, and uniformly stirring to obtain slurry 1, wherein the active substance: CMC: acetylene black: PVDF 100:4:4: 6;
3) collecting the materials on the screen and sieving again, wherein the aperture of the screen is 24 mu m; collecting the material under the screen as a first material;
4) the material above the collection screen was sieved again, with a screen pore size of 32 μm, and the material below the screen was collected: first carbon-silicon composite material: mixing the first natural graphite material with the first material of the silicon-carbon composite material and the first material of the natural graphite, adding CMC, acetylene black and PVDF into a solvent in sequence, adding an active substance after uniformly stirring, and uniformly stirring to obtain slurry 2, wherein the mass ratio of the active substance: CMC: acetylene black: PVDF 100:2:3: 3;
5) coating slurry 2 on a copper foil, drying to obtain a first mixed layer, then coating slurry 1, and drying to obtain a second mixed layer, wherein the thickness of the first mixed layer is 50 micrometers, and the thickness of the second mixed layer is 5 micrometers;
6) and hot-pressing the first mixed layer and the second mixed layer together to obtain the cathode.
Example 2
1) Sieving the silicon-carbon composite material, wherein the aperture of a sieve is 6 mu m, collecting the material on the sieve as a first material, and collecting the material under the sieve as a second material;
2) sieving natural graphite with a sieve mesh aperture of 6 μm, collecting the material under the sieve as a second material, according to the natural graphite: mixing the silicon-carbon composite material with a second material of the silicon-carbon composite material in a ratio of 100:40, adding CMC, acetylene black and PVDF into a solvent in sequence, adding an active substance after uniformly stirring, and uniformly stirring to obtain slurry 1, wherein the active substance: CMC: acetylene black: PVDF 100:6:6: 7;
3) collecting the materials on the screen and sieving again, wherein the aperture of the screen is 24 mu m; collecting the material under the screen as a first material;
4) the material above the collection screen was sieved again, with a screen pore size of 32 μm, and the material below the screen was collected: first carbon-silicon composite material: mixing the first natural graphite material with the first material of the silicon-carbon composite material and the first material of the natural graphite, adding CMC, acetylene black and PVDF into a solvent in sequence, adding an active substance after uniformly stirring, and uniformly stirring to obtain slurry 2, wherein the mass ratio of the active substance: CMC: acetylene black: PVDF 100:3:5: 5;
5) coating slurry 2 on a copper foil, drying to obtain a first mixed layer, then coating slurry 1, and drying to obtain a second mixed layer, wherein the thickness of the first mixed layer is 50 micrometers, and the thickness of the second mixed layer is 10 micrometers;
6) and hot-pressing the first mixed layer and the second mixed layer together to obtain the cathode.
Example 3
1) Sieving the silicon-carbon composite material, wherein the aperture of a sieve is 6 mu m, collecting the material on the sieve as a first material, and collecting the material under the sieve as a second material;
2) sieving natural graphite with a sieve mesh aperture of 6 μm, collecting the material under the sieve as a second material, according to the natural graphite: mixing the silicon-carbon composite material with a second material of the silicon-carbon composite material in a ratio of 100:30, adding CMC, acetylene black and PVDF into a solvent in sequence, adding an active substance after uniformly stirring, and uniformly stirring to obtain slurry 1, wherein the active substance: CMC: acetylene black: PVDF 100:5:5: 7;
3) collecting the materials on the screen and sieving again, wherein the aperture of the screen is 24 mu m; collecting the material under the screen as a first material;
4) the material above the collection screen was sieved again, with a screen pore size of 32 μm, and the material below the screen was collected: first carbon-silicon composite material: mixing the first natural graphite material with the first material of the silicon-carbon composite material and the first material of the natural graphite, adding CMC, acetylene black and PVDF into a solvent in sequence, adding an active substance after uniformly stirring, and uniformly stirring to obtain slurry 2, wherein the mass ratio of the active substance: CMC: acetylene black: PVDF 100:3:4: 4;
5) coating slurry 2 on a copper foil, drying to obtain a first mixed layer, then coating slurry 1, and drying to obtain a second mixed layer, wherein the thickness of the first mixed layer is 50 micrometers, and the thickness of the second mixed layer is 7 micrometers;
6) and hot-pressing the first mixed layer and the second mixed layer together to obtain the cathode.
Comparative example 1
Sequentially adding CMC, acetylene black and PVDF into a solvent, uniformly stirring, adding an active substance, and uniformly stirring to obtain a slurry, wherein the silicon-carbon composite material comprises the following components in percentage by mass: natural graphite: CMC: acetylene black: PVDF 40:60:3:4: 4; . Providing a copper foil, coating slurry on the surface of the copper foil, drying to obtain an active layer with the thickness of 60 mu m, and carrying out hot pressing to obtain the negative electrode.
Test and results
The electrode cut pieces of examples 1 to 3 and comparative example 1 were combined with a lithium sheet counter electrode to form a test cell, 1mol/L lithium hexafluorophosphate was used as an electrolyte salt, EC/EMC 1:1 was used as an electrolyte solution, and reversible capacities of the sheet at 1C and 2C were measured as shown in Table 1. As can be seen from Table 1, the ratio of the reversible capacity of 2C to the reversible capacity of 1C in comparative example 1 is significantly lower than that of examples 1 to 3. The capacity retention at 100 and 300 cycles at 1C is shown in table 2. it can be seen that the cycle performance of the cell of this example is significantly better than that of the cell of comparative example 1.
TABLE 1
TABLE 2
| Cycle 100 (%) | Cycle 300 (%) | |
| Example 1 | 99.1 | 96.8 |
| Example 2 | 99.0 | 96.5 |
| Example 3 | 99.4 | 97.2 |
| Comparative example 1 | 98.3 | 92.6 |
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 (6)
1. A preparation method of a silicon-carbon negative electrode for a lithium ion battery, the silicon-carbon negative electrode comprises a silicon-carbon composite material and natural graphite, wherein the average particle size D50 of the silicon-carbon composite material is 1-3 μm, the average particle size D90 of the silicon-carbon composite material is 5-6 μm, and the average particle size D50 of the natural graphite is 16-18 μm, and the preparation method comprises the following steps:
1) sieving the silicon-carbon composite material, wherein the aperture of a sieve is the same as that of D90 of the silicon-carbon composite material, collecting the material on the sieve as a first material, and collecting the material under the sieve as a second material;
2) sieving natural graphite, wherein the aperture of a sieve mesh is the same as that of D90 of the silicon-carbon composite material, collecting a material below the sieve mesh as a second material, and mixing the material with the second material of the silicon-carbon composite material according to a certain proportion to prepare slurry 1; according to the mass ratio, the natural graphite: the silicon-carbon composite material accounts for 100: 20-40;
3) collecting the materials on the screen in the step 2) and screening again, wherein the aperture of the screen is 1.5 times of that of the natural graphite D50; collecting the material under the screen as a first material;
4) collecting the materials on the screen in the step 3) and screening again, wherein the aperture of the screen is 2 times of that of the natural graphite D50, collecting the materials under the screen, and mixing the materials with the first material of the silicon-carbon composite material and the first material of the natural graphite according to a certain proportion to prepare slurry 2; the material below the screen is as follows according to mass ratio: first carbon-silicon composite material: a first natural graphite material 5-10:100: 15-30;
5) coating the slurry 2 on the current collector, drying to obtain a first mixed layer, then coating the slurry 1, and drying to obtain a second mixed layer;
6) and hot-pressing the first mixed layer and the second mixed layer together to obtain the cathode.
2. The method according to claim 1, wherein in the step 2, the process for preparing the slurry 1 comprises adding the dispersing agent, the conductive agent and the binder into the solvent in sequence, adding the active material after uniformly stirring, and uniformly stirring to obtain the slurry 1, wherein the mass ratio of the active material: dispersing agent: conductive agent: the binder is 100:4-6:4-6: 6-7.
3. The method according to claim 1, wherein in the step 4, the process for preparing the slurry 2 comprises adding the dispersing agent, the conductive agent and the binder into the solvent in sequence, adding the active material after uniformly stirring, and uniformly stirring to obtain the slurry 2, wherein the mass ratio of the active material: dispersing agent: conductive agent: the binder is 100:2-3:3-5: 3-5.
4. The method according to claim 2 or 3, wherein the solvent is a mixed solution of water and ethanol, and the volume ratio of water: ethanol-10-8: 1.
5. The method of claim 1, wherein the thickness ratio of the first hybrid layer to the second hybrid layer is 5-10: 1.
6. A negative electrode, characterized by being prepared by the method of any one of claims 1 to 5.
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| JP5807749B2 (en) * | 2011-12-08 | 2015-11-10 | ソニー株式会社 | Positive electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device |
| CN102709531B (en) * | 2012-01-09 | 2016-11-23 | 宁德新能源科技有限公司 | A kind of lithium ion battery and negative pole thereof |
| JP6136612B2 (en) * | 2013-06-14 | 2017-05-31 | ソニー株式会社 | Lithium ion secondary battery electrode, lithium ion secondary battery, battery pack, electric vehicle, power storage system, electric tool and electronic device |
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| CN108682785B (en) * | 2018-05-17 | 2021-04-06 | 桑德新能源技术开发有限公司 | Negative electrode for lithium battery, preparation method of negative electrode and lithium battery |
| CN109004178A (en) * | 2018-08-02 | 2018-12-14 | 天津普兰能源科技有限公司 | A kind of high-pressure solid, high-flexibility metatitanic acid pole piece |
| CN110335996A (en) * | 2019-05-28 | 2019-10-15 | 上海德朗能动力电池有限公司 | A kind of high capacity lithium ion cells cathode and its application |
| CN110148708B (en) * | 2019-05-30 | 2021-05-11 | 珠海冠宇电池股份有限公司 | Negative plate and lithium ion battery |
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