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Positive pole plate for improving rate capability of lithium ion battery as well as preparation method and application of positive pole plate

A lithium-ion battery and positive electrode technology, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, and positive electrodes, can solve problems such as unfavorable battery energy density and improvement, and achieve improved battery rate discharge performance, simple operation, and improved battery performance. The effect of energy density

Pending Publication Date: 2021-03-23
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above methods are not conduc

Method used

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  • Positive pole plate for improving rate capability of lithium ion battery as well as preparation method and application of positive pole plate
  • Positive pole plate for improving rate capability of lithium ion battery as well as preparation method and application of positive pole plate
  • Positive pole plate for improving rate capability of lithium ion battery as well as preparation method and application of positive pole plate

Examples

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preparation example Construction

[0048] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0049]Unless otherwise specified, the experimental methods used in the following examples are conventional methods; the reagents and materials used in the following examples, unless otherwise specified, can be obtained from commercial sources.

[0050] The aluminum mesh used in the following examples is selected from aluminum meshes with a mesh number of 500 and a thickness of 10 μm.

Embodiment 1

[0058] Others are the same as Comparative Example 1, the difference is that a layer of aluminum mesh is inserted in the positive electrode layer, and the total thickness of the positive electrode layer remains unchanged; that is, when coating, a layer of positive electrode layer with a thickness of 75 μm is first coated on both sides of the current collector and named positive electrode Layer X, add a layer of aluminum mesh on the surface of the positive electrode layer X, and vacuum bake at 95°C for 2-4h; then coat a layer of positive electrode layer with a thickness of 75μm on the aluminum mesh and name it as positive electrode layer Y. Welded together with aluminum strips, baked in vacuum at 95°C for 8 hours, and obtained the positive electrode sheet, the results are as follows figure 1 As shown, a positive electrode layer X5, an aluminum mesh 3 and a positive electrode layer Y5 are respectively arranged on both sides of the current collector 1;

Embodiment 2

[0060] Others are the same as Comparative Example 1, the difference is that a layer of aluminum mesh is inserted in the positive electrode layer, and the total thickness of the positive electrode layer becomes thicker; that is, when coating, a layer of positive electrode layer with a thickness of 80 μm is first coated on both sides of the current collector and named as the positive electrode Layer X, add a layer of aluminum mesh on the surface of the positive electrode layer X, and vacuum bake at 95°C for 2-4h; then coat a layer of positive electrode layer with a thickness of 80μm on the aluminum mesh and name it as the positive electrode layer Y, and combine the aluminum mesh with the current collector They were welded together with aluminum strips, and baked in vacuum at 95°C for 8 hours to obtain the obtained positive electrode sheet.

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Abstract

The invention provides a positive pole plate for improving rate capability of a lithium ion battery as well as a preparation method and application thereof. The positive pole plate comprises a currentcollector, a positive pole layer and an aluminum mesh; the aluminum mesh is connected with the current collector by an aluminum strip; the arrangement of the aluminum mesh is beneficial to reducing polarization and impedance of the positive pole plate so as to improve rate discharge performance of the battery. Meanwhile, the positive pole active substance loading capacity can be increased to a certain extent, and the battery energy density is improved. The positive pole plate of the lithium ion battery is simple to operate and easy to commercialize, and has remarkable effects of improving therate capability of the battery and solving the problem of large positive pole surface density impedance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a positive electrode sheet for improving the rate performance of lithium-ion batteries, a preparation method and an application thereof. Background technique [0002] Electronic products such as electric tools, electronic cigarettes, drones, start-stop power supplies, etc., have high requirements for the rate performance of lithium-ion batteries due to the requirement of fast discharge. With the continuous development of the market and the improvement of people's consumption concept, the demand for energy density of lithium-ion batteries is also getting higher and higher on the basis of satisfying high-rate discharge. [0003] In order to improve the rate discharge performance of lithium-ion batteries, on the one hand, the conductivity of the positive electrode material is improved through the positive electrode formulation, etc., and the impedance of th...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/66H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/661H01M4/667H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 颜世银刘春洋陈若凡薛佳宸李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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