High-load electrode, preparation method and lithium ion battery thereof

A high-load, electrode technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems of battery gram capacity cycle and low-temperature discharge performance degradation, poor electrolyte infiltration, and increased internal resistance of pole pieces , to achieve the effect of improving polarization, reducing the degree of separation, and improving adhesion

Active Publication Date: 2020-07-17
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are certain technical difficulties in the actual manufacture and application of thick electrodes. As the thickness of the electrode sheet increases, it is easy to cause problems such as poor electrolyte infiltration and increased polarization internal resistance inside the electrode sheet, which leads to battery failure. Deterioration of gram capacity development, cycle and low temperature discharge performance

Method used

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  • High-load electrode, preparation method and lithium ion battery thereof
  • High-load electrode, preparation method and lithium ion battery thereof
  • High-load electrode, preparation method and lithium ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Production of positive and highly loaded pole pieces:

[0023] a. Pour positive electrode active material NCM622, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 94.6:1.6:1.6:2.2, Mix and stir evenly to prepare positive electrode slurry A with a solid content of 75%;

[0024] b. Pour positive electrode active material NCM622, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 95.4:1.4:1.4:1.8, Mix and stir evenly to prepare positive electrode slurry B with a solid content of 75%;

[0025] c. Coat the positive electrode slurry A on the aluminum foil current collector, and the total loading of the coating after drying is 50mg / cm 2 , the total thickness is 200 μm, the thickness of the coating after rolling is 180 μm, and the positive electrode sheet A is obtained;

[0026] d. Coat the positive electrode slurry B on the positive elect...

Embodiment 2

[0039] Production of positive and highly loaded pole pieces:

[0040] a. Pour positive electrode active material NCM622, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 94.4:1.7:1.7:2.2, Mix and stir evenly to prepare positive electrode slurry A with a solid content of 75%;

[0041] b. Pour positive electrode active material NCM622, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 95.0:1.5:1.5:2.0, Mix and stir evenly to prepare positive electrode slurry B with a solid content of 75%;

[0042] c. Pour positive electrode active material NCM622, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 95.6:1.3:1.3:1.8, Mix and stir evenly to prepare positive electrode slurry C with a solid content of 75%;

[0043] d. Coat the positive electrode slurry A on the aluminum foil cu...

Embodiment 3

[0076] Production of positive and highly loaded pole pieces:

[0077] a. Pour positive active material NCM811, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 94.4:1.5:1.5:2.6, Mix and stir evenly to prepare positive electrode slurry A with a solid content of 75%;

[0078] b. Pour positive electrode active material NCM811, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 95.2:1.2:1.2:2.4, Mix and stir evenly to prepare positive electrode slurry B with a solid content of 75%;

[0079] c. Coat the positive electrode slurry A on the aluminum foil current collector, and the total loading of the coating after drying is 63mg / cm 2 , the total thickness is 250 μm, the thickness of the coating after rolling is 220 μm, and the positive electrode sheet A is obtained;

[0080] d. Coat the positive electrode slurry B on the positive electrode sheet...

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Abstract

The invention relates to a high-load electrode. The periphery of a current collector is at least coated with two layers of slurry from inside to outside, and the slurry comprises an active substance,a conductive agent and a binder; in the vertical direction from the outer surface of the pole piece to the surface of the current collector, the weight ratio of the binder in each layer of slurry is sequentially increased, and the weight ratio of the conductive agent is sequentially increased, wherein the rolling compression amount of each layer of slurry is sequentially reduced, and the sum of the rolling thicknesses of all the layers of slurry reaches the thickness required by design. By applying the high-load electrode, the liquid absorption time can be shortened; the infiltration effect can be improved; and the corresponding lithium ion battery has excellent gram volume exertion, long cycle and low-temperature discharge performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-load electrode, a preparation method and a lithium ion battery thereof. Background technique [0002] With the continuous advancement of science and technology, lithium-ion batteries are gradually applied to many fields, from portable electronic products to electric vehicles, energy storage power supplies, aviation fields, etc. Especially for electric vehicles, in order to shorten the application gap with traditional vehicles, it is necessary not only to extend the mileage and service life of a single charge as much as possible while ensuring safety, but also to reduce the mileage affected by temperature, especially at low temperatures . Furthermore, batteries matching electric vehicles are required to have higher energy density, cycle life, and low-temperature discharge capability. Therefore, higher requirements are put forward for the energy density, cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525H01M2220/20Y02E60/10H01M4/622H01M4/625H01M4/131H01M4/505H01M4/621H01M4/525H01M4/5825H01M4/1391H01M2004/021H01M4/62H01M4/1393H01M4/136H01M4/36H01M4/133H01M4/0435H01M4/485H01M4/623H01M4/366H01M4/0404H01M4/661
Inventor 郑彦俊马华刘峰从长杰王驰伟
Owner TIANJIN ENERGIES
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