Negative plate as well as preparation method and application thereof

A technology of negative electrode sheet and layer activity, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of serious volume expansion and rapid cycle decay of negative electrode sheet, reduce volume expansion rate, improve energy density, and improve capacity Effect

Inactive Publication Date: 2020-09-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a negative electrode sheet and a preparation method thereof, which are used to solve th

Method used

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  • Negative plate as well as preparation method and application thereof
  • Negative plate as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The structure of the negative plate provided in this embodiment is as follows: figure 1 As shown, N=2:

[0049] The first layer of active layer is obtained by coating 50 μm of the first layer of active layer slurry, and the first layer of active layer slurry includes 90g of pure nano-silicon and 10g of natural graphite;

[0050] The second active layer is obtained by coating 50 μm of the second active layer slurry, and the second active layer slurry includes 80 g of pure nano-silicon and 20 g of natural graphite.

[0051] The preparation method of the negative plate provided in this embodiment comprises:

[0052] 1. Weigh 90g of nano-silicon material and 10g of natural graphite, mix with 5g of binder PAA, 1g of dispersant sodium dodecylbenzenesulfonate, 2g of conductive agent carbon nanotubes, 2g of thickener CMC and 100g of water to prepare the first One layer of active layer slurry;

[0053] Weigh 80g of nano-silicon material and 20g of natural graphite, mix with 5...

Embodiment 2

[0057] The structure of the negative plate provided in this embodiment is as follows: figure 1 As shown, N=3:

[0058] The first layer of active layer is obtained by coating 40 μm of the first layer of active layer slurry, including 90g of pure nano-silicon and 10g of natural graphite in the first layer of active layer slurry;

[0059] The second layer of active layer is obtained by coating 30 μm of the second layer of active layer slurry, and the second layer of active layer slurry includes 80g of pure nano-silicon and 20g of natural graphite;

[0060] The third active layer is obtained by coating the slurry of the third active layer with a thickness of 30 μm, and the slurry of the third active layer includes 70 g of pure nano-silicon and 30 g of natural graphite.

[0061] The preparation method of the negative electrode sheet provided in this example is similar to that of Example 1, the only difference lies in the quality and coating thickness of pure nano-silicon and natur...

Embodiment 3

[0063] The structure of the negative plate provided in this embodiment is as follows: figure 1 As shown, N=4:

[0064] The first layer of active layer is obtained by coating 25 μm of the first layer of active layer slurry, including 90g of pure nano-silicon and 10g of natural graphite in the first layer of active layer slurry;

[0065] The second layer of active layer is obtained by coating 25 μm of the second layer of active layer slurry, and the second layer of active layer slurry includes 80g of pure nano-silicon and 20g of natural graphite;

[0066] The third layer of active layer is obtained by coating 25 μm of the third layer of active layer slurry, and the third layer of active layer slurry includes 70g of pure nano-silicon and 30g of natural graphite;

[0067] The fourth active layer is obtained by coating 25 μm of the fourth active layer slurry, and the fourth active layer slurry includes 60 g of pure nano-silicon and 40 g of natural graphite.

[0068] The preparati...

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Abstract

The invention provides a negative plate as well as a preparation method and application thereof. On the first aspect, the invention provides a negative plate. The negative plate comprises a current collector and N active layers, wherein the active layer comprises a carbon material and a silicon material, the layer number set of the active layers is recorded as S={1, 2,..., i-1, i,..., N}, N is greater than or equal to 2, and the direction from the first active layer to the Nth active layer is the direction gradually far away from the current collector; and the mass of the silicon material in the (i-1)th active layer is greater than the mass of the silicon material in the ith active layer, and the mass of the carbon material in the (i-1)th active layer is less than the mass of the carbon material in the ith active layer. According to the negative plate provided by the invention, through a mode that the mass of the silicon material is gradually reduced layer by layer and the mass of thecarbon material is gradually increased layer by layer, powder falling of the negative plate in a circulation process can be effectively prevented, the volume expansion rate of the negative plate is reduced, and the circulation performance of the negative plate is improved.

Description

technical field [0001] The invention relates to a negative electrode sheet, a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Background technique [0002] With the development of new energy sources, lithium-ion batteries have made great progress in various fields. The selection and preparation of the negative electrode sheet of the lithium-ion battery have a great influence on the performance of the lithium-ion battery. Carbon materials have the advantages of excellent electrical conductivity, low expansion rate, abundant storage in nature, good cycle stability, and high Coulombic efficiency, making carbon materials the most widely used anode materials in lithium-ion battery anode sheets. However, due to the low theoretical capacity of carbon materials, and the actual capacity of carbon materials is close to the theoretical capacity of carbon materials, especially graphite (372mAh / g), the development of lithium-ion b...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/587H01M10/0525
CPCH01M4/134H01M4/1395H01M4/364H01M4/386H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 袁号李素丽赵伟李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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