CN114005957A - Negative pole piece, preparation method thereof and lithium ion battery - Google Patents
Negative pole piece, preparation method thereof and lithium ion battery Download PDFInfo
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- CN114005957A CN114005957A CN202111142238.4A CN202111142238A CN114005957A CN 114005957 A CN114005957 A CN 114005957A CN 202111142238 A CN202111142238 A CN 202111142238A CN 114005957 A CN114005957 A CN 114005957A
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- 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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- 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
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
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- 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 belongs to the technical field of lithium ion batteries, and particularly relates to a negative pole piece and a preparation method thereof, and a lithium ion battery, wherein the negative pole piece comprises a negative pole current collector, a first active coating and a second active coating, the first active coating is coated on the long plaster surface of the negative pole current collector, the second active coating is coated on the short plaster surface of the negative pole current collector, and the first active coating and the second active coating are both negative pole active materials containing artificial graphite; the artificial graphite in the first active coating and the artificial graphite in the second active coating are set to have different gram capacities and OI values, so that the overpotential of the long paste coating surface of the negative electrode current collector and the diffusion impedance between the long paste coating surfaces of the positive electrode and the negative electrode are reduced, the polarization of high-voltage lithium cobaltate in the circulation process is reduced, and the lithium separation phenomenon and the capacity retention rate of the high-voltage lithium cobaltate ion battery prepared by adopting the negative electrode pole piece in the circulation process are improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a negative electrode plate, a preparation method of the negative electrode plate and a lithium ion battery.
Background
The lithium cobaltate material as the lithium ion battery anode material has the advantages of high voltage, high compaction density and the like, and is an ideal lithium ion battery anode material, but under the conventional charging voltage of about 4.2V, the capacity of the lithium cobaltate material is limited, and the volume energy density of the battery can be improved by improving the charging voltage of the lithium cobaltate battery. Therefore, the research of the lithium ion battery at present is transferred to high-voltage (the charging voltage is more than or equal to 4.45V) lithium cobaltate as the positive electrode material of the lithium ion battery, the volume energy density of the battery can be improved, but the polarization is large in the circulating process, the problems of lithium precipitation, fast capacity attenuation and the like are easy to occur, and the problems are mainly solved by improving the dynamic performance of the negative electrode at present, but cannot be completely solved.
In view of the above, it is necessary to provide a technical solution for solving the above technical problems, in which an active coating technology on a negative electrode plate is improved to improve a lithium deposition phenomenon and a capacity retention ratio of a high-voltage lithium cobalt oxide lithium ion battery during a cycle process.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the negative pole piece, the preparation method thereof and the lithium ion battery are provided, and the polarization of the high-voltage lithium cobaltate in the circulating process can be reduced, so that the lithium precipitation phenomenon and the capacity retention rate of the high-voltage lithium cobaltate lithium ion battery in the circulating process can be improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a negative electrode plate, which comprises a negative electrode current collector, a first active coating and a second active coating, wherein the first active coating is coated on a long plaster coating surface of the negative electrode current collector, the second active coating is coated on a short plaster coating surface of the negative electrode current collector, and the first active coating and the second active coating are both negative electrode active materials containing artificial graphite; the artificial graphite in different gram capacities is realized by controlling graphitization temperature, and the overpotential of the long paste coating surface of the negative electrode current collector and the diffusion impedance between the long paste coating surfaces of the positive electrode and the negative electrode are reduced by setting the artificial graphite in the first active coating and the artificial graphite in the second active coating to be different gram capacities and OI values, so that the polarization of the high-voltage lithium cobaltate in the circulation process can be reduced, and the lithium separation phenomenon and the capacity retention rate of the high-voltage lithium cobaltate in the circulation process are improved. Preferably, the thickness of the first active coating and the thickness of the second active coating are in the range of 60-120 um.
Graphitization is a key link in the preparation process of the artificial graphite, the graphitization can improve the thermoelectric conductivity of the artificial graphite, improve the thermal shock resistance and chemical stability of the artificial graphite, improve the lubricity and wear resistance of the artificial graphite, remove impurities and improve the strength of the artificial graphite, generally, the higher the graphitization temperature is, the fewer the defects of the artificial graphite crystal are, the higher the capacity is, and the preparation of the artificial graphite with different gram capacities can be realized by controlling the graphitization temperature. Preferably, the artificial graphite in the first active coating and the artificial graphite in the second active coating are set to different graphitization temperatures. The graphitization temperature of the artificial graphite in the first active coating is T1, the graphitization temperature of the artificial graphite in the second active coating is T2, wherein T2 is more than T1, and T2-T1 is more than or equal to 50 ℃ and less than or equal to 200 ℃. The graphitization temperature range of the artificial graphite in the first active coating is as follows: t1 is more than or equal to 2600 ℃ and less than or equal to 2800 ℃; the graphitization temperature range of the artificial graphite in the second active coating is as follows: t2 is more than or equal to 2650 ℃ and less than or equal to 3000 ℃.
The gram capacity of the artificial graphite is gradually increased along with the increase of the graphitization temperature, the artificial graphite in the first active coating and the second active coating are provided with different gram capacities, and the gram capacity of the artificial graphite in the second active coating is larger than that of the artificial graphite in the first active coating. Specifically, the gram volume of the artificial graphite in the first active coating is A, the gram volume of the artificial graphite in the second active coating is B, and B-A is more than or equal to 1.5mAh/g and less than or equal to 4.0 mAh/g. The gram capacity range of the artificial graphite in the first active coating is: a is more than or equal to 350mAh/g and less than or equal to 356 mAh/g; the gram capacity range of the artificial graphite in the second active coating is: 351.5mAh/g is less than or equal to B and less than or equal to 360 mAh/g.
Preferably, the artificial graphite in the first active coating and the second active coating is provided with different gram capacities and different OI values, the overpotential of the long paste coating surface of the negative electrode current collector is reduced through the setting of the gram capacities and the OI values of the artificial graphite in a differentiation mode, the dynamic performance of the first active coating is better, the diffusion impedance between the long paste coating surfaces of the positive electrode and the negative electrode is reduced, the polarization of the high-voltage lithium cobalt oxide on the long paste coating side of the positive electrode is smaller, and the lithium separation phenomenon and the capacity retention rate of the high-voltage lithium cobalt oxide in the circulation process are improved.
Preferably, the artificial graphite in the first active coating and the artificial graphite in the second active coating are provided with different OI values, the OI value of the artificial graphite in the first active coating is OI1, the OI value of the artificial graphite in the second active coating is OI2, wherein OI2 is larger than OI1, and 0.5-OI 2-OI1 is smaller than or equal to 3.0. And OI is C004/C110, wherein C004 is the peak intensity of 004 crystal planes of the artificial graphite in X-ray diffraction, and C110 is the peak intensity of 110 crystal planes of the artificial graphite in X-ray diffraction. Furthermore, the artificial graphite in the first active coating has an OI value in the range of: OI1 is more than or equal to 1.0 and less than or equal to 2.0; the range of OI values of the artificial graphite in the second active coating is: OI2 is more than or equal to 1.5 and less than or equal to 5.0.
Furthermore, the mass ratio of the components of the first active coating layer of the present invention is as follows:
artificial graphite: 96.5% -97.5%; preferably, the artificial graphite comprises one or a mixture of carbon fiber, pyrolytic carbon and foam artificial graphite.
Conductive agent: 0.5 to 1.0 percent; the conductive agent is one or more of conductive carbon black, carbon nano tubes, carbon nano fibers, conductive artificial graphite, graphene and the like.
Adhesive: 1.5% -3.0%; the binder is polyacrylic acid, sodium carboxymethylcellulose, styrene butadiene rubber or modified products thereof with binding effect.
The mass ratio of the components of the second active coating is as follows:
artificial graphite: 96.5% -97.5%; preferably, the artificial graphite comprises one or a mixture of carbon fiber, pyrolytic carbon and foam artificial graphite.
Conductive agent: 0.5 to 1.0 percent; the conductive agent is one or more of conductive carbon black, carbon nano tubes, carbon nano fibers, conductive artificial graphite, graphene and the like.
Adhesive: 1.5% -3.0%; the binder is polyacrylic acid, sodium carboxymethylcellulose, styrene butadiene rubber or modified products thereof with binding effect.
In a second aspect, the invention further provides a preparation method of the negative pole piece, the first active coating and the second active coating are prepared, the first active coating is coated on the long paste coating surface of the negative pole current collector, and the second active coating is coated on the short paste coating surface of the negative pole current collector, so that the negative pole piece is prepared. Preferably, the negative electrode current collector is a copper foil, a carbon-coated copper foil, a microporous copper foil, other functional copper foil, or the like.
In a third aspect, the present invention provides a lithium ion battery, which comprises a positive electrode plate, a negative electrode plate and a diaphragm wound together. The invention is used for improving the polarization of high-voltage lithium cobalt oxide in the circulation process, the positive pole piece comprises the positive active material of the high-voltage lithium cobalt oxide, and the negative pole piece is the negative pole piece. The lithium ion battery has a capacity retention rate of 96.7% @100T or more after being cycled for 100 times at the temperature of 45 ℃, a capacity retention rate of 92.5% @200T or more after being cycled for 200 times at the temperature of 45 ℃ and a capacity retention rate of 88.9% @300T or more after being cycled for 300 times at the temperature of 45 ℃.
Compared with the prior art, the beneficial effects of the invention include but are not limited to:
the invention controls the capacities of different artificial graphite grams through the graphitization temperatures of different artificial graphite, and improves the overpotential of the long paste coating surface of the negative current collector and the diffusion impedance between the long paste coating surfaces of the positive electrode and the negative electrode by the technology of coating the active coatings with different artificial graphite gram capacities and OI values on the two sides of the negative electrode, thereby reducing the polarization of high-voltage lithium cobaltate in the circulation process and improving the lithium separation phenomenon and the capacity retention rate of the high-voltage lithium cobaltate ion battery prepared by adopting the negative electrode pole piece in the circulation process.
Drawings
Fig. 1 is a schematic structural diagram of a negative electrode tab of the present invention.
In fig. 1: 10-a negative current collector; 20-a first reactive coating; 30-second reactive coating
Detailed Description
Embodiments of the present application will be described in detail below. The examples of the present application should not be construed as limiting the present application.
The present application is further illustrated with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the claims.
Example 1
The first negative electrode slurry with the artificial graphite gram capacity of 355mAh/g is obtained according to the mass percentage ratio of 97.0% to 0.5% to 1.2% to 1.3% of artificial graphite, the graphitization temperature T1 of the artificial graphite is 2700 ℃, the OI value of the artificial graphite is OI1 which is 1.2, the first negative electrode slurry is coated on the long paste coating surface of the negative electrode current collector carbon-coated copper foil, and a first active coating with the thickness of 60 mu m is formed; the second negative electrode slurry with the artificial graphite gram capacity of 356mAh/g is obtained by the mass percent ratio of 97.0% to 0.5% to 1.2% to 1.3% of artificial graphite, the graphitization temperature T2 of the artificial graphite is 2750 ℃, the OI value of the artificial graphite is OI2 ═ 2.0, and the second negative electrode slurry is coated on the short paste coating surface of the negative electrode current collector carbon-coated copper foil to form a second active coating with the thickness of 60 mu m; obtaining a negative pole piece, rolling, slitting and manufacturing the negative pole piece, winding the manufactured negative pole piece, a positive pole piece and a diaphragm to obtain a winding core, packaging the winding core to obtain a dry cell, baking the dry cell, injecting, forming, secondary sealing and sorting to obtain a lithium ion battery, and finally testing the lithium ion battery.
Example 2
The first negative electrode slurry with the artificial graphite gram capacity of 355mAh/g is obtained according to the mass percentage ratio of 97.0% to 0.5% to 1.2% to 1.3% of artificial graphite, the graphitization temperature T1 of the artificial graphite is 2700 ℃, the OI value of the artificial graphite is OI1 which is 1.2, the first negative electrode slurry is coated on the long paste coating surface of the negative electrode current collector carbon-coated copper foil, and a first active coating with the thickness of 60 mu m is formed; the second negative electrode slurry with the artificial graphite gram capacity of 358mAh/g is obtained by 97.0 percent to 0.5 percent to 1.2 percent to 1.3 percent of artificial graphite, the graphitization temperature T2 of the artificial graphite is 2850 ℃, the OI value of the artificial graphite is OI2 to 2.5, and the second negative electrode slurry is coated on the short paste coating surface of the negative electrode current collector carbon-coated copper foil to form a second active coating with the thickness of 60 mu m; obtaining a negative pole piece, rolling, slitting and manufacturing the negative pole piece, winding the manufactured negative pole piece, a positive pole piece and a diaphragm to obtain a winding core, packaging the winding core to obtain a dry cell, baking the dry cell, injecting, forming, secondary sealing and sorting to obtain a lithium ion battery, and finally testing the lithium ion battery.
Example 3
The first negative electrode slurry with the artificial graphite gram capacity of 355mAh/g is obtained according to the mass percentage ratio of 97.0% to 0.5% to 1.2% to 1.3% of artificial graphite, the graphitization temperature T1 of the artificial graphite is 2700 ℃, the OI value of the artificial graphite is OI1 which is 1.2, the first negative electrode slurry is coated on the long paste coating surface of the negative electrode current collector carbon-coated copper foil, and a first active coating with the thickness of 60 mu m is formed; the second negative electrode slurry with the artificial graphite gram capacity of 360mAh/g is obtained by 97.0 percent to 0.5 percent to 1.2 percent to 1.3 percent of artificial graphite, the graphitization temperature T2 of the artificial graphite is 3000 ℃, the OI value of the artificial graphite is OI2 which is 1.5, the second negative electrode slurry is coated on the short paste coating surface of the negative electrode current collector carbon-coated copper foil, and a second active coating with the thickness of 60 mu m is formed; obtaining a negative pole piece, rolling, slitting and manufacturing the negative pole piece, winding the manufactured negative pole piece, a positive pole piece and a diaphragm to obtain a winding core, packaging the winding core to obtain a dry cell, baking the dry cell, injecting, forming, secondary sealing and sorting to obtain a lithium ion battery, and finally testing the lithium ion battery.
Comparative example 1
The negative electrode slurry with the artificial graphite gram capacity of 358mAh/g is obtained by the mass percent ratio of 97.0 percent to 0.5 percent to 1.2 percent to 1.3 percent of artificial graphite, the graphitization temperature T of the artificial graphite is 2850 ℃, the OI value of the artificial graphite is 2.5, the negative electrode slurry is respectively coated on the long paste coating surface and the short paste coating surface of the negative electrode current collector carbon-coated copper foil, and active coatings with the thickness of 60 mu m are respectively formed; obtaining a negative pole piece, rolling, slitting and manufacturing the negative pole piece, winding the manufactured negative pole piece, a positive pole piece and a diaphragm to obtain a winding core, packaging the winding core to obtain a dry cell, baking the dry cell, injecting, forming, secondary sealing and sorting to obtain a lithium ion battery, and finally testing the lithium ion battery.
And (3) performance testing:
the prepared lithium ion battery is subjected to cycle test, and specific test data are shown in the following table 1:
TABLE 1
As can be seen from table 1 according to the performance test results, in examples 1, 2, and 3, compared with comparative example 1, the capacity retention rate of the lithium ion battery with the negative electrode coated with active coatings with different artificial graphite gram capacities and OI values on both sides is better than that of the lithium ion battery with the negative electrode coated with active coatings with the same artificial graphite gram capacities and OI values on both sides, and the lithium deposition phenomenon is improved more significantly. The lithium ion battery can achieve 96.7% @100T of capacity retention rate after being cycled for 100 times at the temperature of 45 ℃, can achieve 92.5% @200T of capacity retention rate after being cycled for 200 times at the temperature of 45 ℃, and can achieve 88.9% @300T of capacity retention rate after being cycled for 300 times at the temperature of 45 ℃.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. The present invention is illustrated by the above-mentioned examples, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, i.e. it is not meant to imply that the present invention must rely on the above-mentioned detailed process equipment and process flow to be practiced. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A negative pole piece is characterized by comprising a negative pole current collector, a first active coating and a second active coating, wherein the first active coating is coated on the long plaster surface of the negative pole current collector, the second active coating is coated on the short plaster surface of the negative pole current collector, and the first active coating and the second active coating are both negative pole active materials containing artificial graphite; the artificial graphite with different gram capacities is realized by controlling the graphitization temperature, and the overpotential of the long paste coating surface of the negative electrode current collector and the diffusion impedance between the long paste coating surfaces of the positive electrode and the negative electrode are reduced by setting the artificial graphite in the first active coating and the artificial graphite in the second active coating to be different in gram capacities and OI values.
2. The negative electrode plate as claimed in claim 1, wherein the graphitization temperature of the artificial graphite in the first active coating is T1, and the graphitization temperature of the artificial graphite in the second active coating is T2, wherein T2 is not less than T1, and T2-T1 is not less than 200 ℃.
3. The negative electrode tab of claim 2, wherein the graphitization temperature of the artificial graphite in the first active coating is in the range of: t1 is more than or equal to 2600 ℃ and less than or equal to 2800 ℃; the graphitization temperature range of the artificial graphite in the second active coating is as follows: t2 is more than or equal to 2650 ℃ and less than or equal to 3000 ℃.
4. The negative electrode plate as claimed in claim 1, wherein the gram volume of the artificial graphite in the first active coating is A, and the gram volume of the artificial graphite in the second active coating is B, wherein B is greater than or equal to 1.5mAh/g and less than or equal to B-A is greater than or equal to 4.0 mAh/g.
5. The negative electrode sheet of claim 4, wherein the first active coating comprises artificial graphite having a gram capacity in the range of: a is more than or equal to 350mAh/g and less than or equal to 356 mAh/g; the gram capacity range of the artificial graphite in the second active coating is as follows: 351.5mAh/g is less than or equal to B and less than or equal to 360 mAh/g.
6. The negative electrode sheet of claim 1, wherein the artificial graphite in the first active coating has an OI value of OI1 and the artificial graphite in the second active coating has an OI2, wherein OI2 > OI1 and 0.5 ≦ OI2-OI1 ≦ 3.0.
7. The negative electrode sheet of claim 6, wherein the artificial graphite in the first active coating has an OI value in the range of: OI1 is more than or equal to 1.0 and less than or equal to 2.0; the range of OI values of the artificial graphite in the second active coating is: OI2 is more than or equal to 1.5 and less than or equal to 5.0.
8. The negative electrode tab of claim 1,
the mass ratio of each component of the first active coating is as follows:
artificial graphite: 96.5% -97.5%;
conductive agent: 0.5 to 1.0 percent;
adhesive: 1.5% -3.0%;
the mass ratio of the components of the second active coating is as follows:
artificial graphite: 96.5% -97.5%;
conductive agent: 0.5 to 1.0 percent;
adhesive: 1.5 to 3.0 percent.
9. A preparation method of a negative pole piece is characterized by comprising the following steps:
preparing a first active coating and a second active coating, and coating the first active coating on the long paste coating surface of the negative current collector; coating the second active coating on the short paste coating surface of the negative current collector; preparing the negative pole piece of any one of claims 1 to 8.
10. A lithium ion battery is characterized in that the lithium ion battery is formed by winding a positive pole piece, a negative pole piece and a diaphragm, wherein the positive pole piece comprises a positive active material of high-voltage lithium cobalt oxide, the negative pole piece is the negative pole piece according to any one of claims 1 to 8, the capacity retention rate of the lithium ion battery after being cycled for 100 times under the temperature condition of 45 ℃ reaches more than 96.7% @100T, the capacity retention rate of the lithium ion battery after being cycled for 200 times under the temperature condition of 45 ℃ reaches more than 92.5% @200T, and the capacity retention rate of the lithium ion battery after being cycled for 300 times under the temperature condition of 45 ℃ reaches more than 88.9% @ 300T.
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| WO2024040420A1 (en) * | 2022-08-23 | 2024-02-29 | 宁德时代新能源科技股份有限公司 | Secondary battery and electric apparatus |
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| CN106058154A (en) * | 2016-08-01 | 2016-10-26 | 东莞新能源科技有限公司 | Pole piece of negative electrode and preparation method of pole piece as well as lithium-ion battery using negative electrode |
| CN106601994A (en) * | 2017-01-05 | 2017-04-26 | 深圳市优特利电源有限公司 | Negative electrode, preparation method thereof and low-temperature lithium ion battery |
| CN108807848A (en) * | 2018-05-11 | 2018-11-13 | 宁德时代新能源科技股份有限公司 | Negative electrode plate and secondary battery containing same |
| CN112640158A (en) * | 2019-07-29 | 2021-04-09 | 株式会社Lg化学 | Jelly-roll type electrode assembly having negative electrode with negative electrode mixture having different active material compositions formed on both sides of electrode current collector, secondary battery including the same, and device including the secondary battery |
| CN110534701A (en) * | 2019-08-06 | 2019-12-03 | 荣盛盟固利新能源科技有限公司 | A kind of electrode plates, electrode plates manufacturing method and electrochemical appliance |
| CN110707284A (en) * | 2019-10-16 | 2020-01-17 | 珠海冠宇电池有限公司 | Lithium ion battery cathode and preparation method thereof |
| CN111628141A (en) * | 2020-07-16 | 2020-09-04 | 珠海冠宇电池股份有限公司 | Silicon-doped negative pole piece and lithium ion battery comprising same |
| CN112582583A (en) * | 2020-12-15 | 2021-03-30 | 东莞维科电池有限公司 | Preparation method of quick-charging type lithium ion battery pole piece, pole piece and lithium ion battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024040420A1 (en) * | 2022-08-23 | 2024-02-29 | 宁德时代新能源科技股份有限公司 | Secondary battery and electric apparatus |
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