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Negative pole piece and lithium ion battery comprising negative pole piece

A negative electrode, lithium ion technology, applied in the direction of negative electrode, secondary battery, battery electrode, etc.

Active Publication Date: 2020-12-18
ZHUHAI COSMX POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the deficiencies of the prior art, especially to solve the problem of lithium ionization in the edge area of ​​the surface of the negative pole piece near the negative pole tab during the fast charging process of the lithium ion battery, the present invention provides a negative pole piece and comprising In the lithium ion battery of the negative electrode pole piece, the mass capacity i of the negative pole pole piece near the negative pole tab of the present invention is larger, and the lithium ion diffusion rate is faster, thereby solving the problem of lithium ion battery near the negative pole in the fast charging process. The problem of lithium deposition on the surface edge of the negative electrode sheet at the tab, and the cycle performance and service life of the lithium-ion battery can also be further improved

Method used

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  • Negative pole piece and lithium ion battery comprising negative pole piece
  • Negative pole piece and lithium ion battery comprising negative pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) Preparation of the first coating area and the third coating area slurry

[0067] 76g of hard carbon, 19g of silicon oxide, 2g of styrene-butadiene rubber, 1.5g of sodium carboxymethylcellulose and 1.5g of conductive carbon black were mixed and dispersed in deionized water to obtain the slurry for the first coating area, which was designated as T1.

[0068] (2) Preparation of the second coating area and the fourth coating area slurry

[0069] Mix and disperse 95g of graphite, 2g of styrene-butadiene rubber, 1.5g of sodium carboxymethyl cellulose and 1.5g of conductive carbon black in deionized water to obtain the slurry for the second coating area, which is denoted as B1.

[0070] (3) Preparation of negative electrode sheet

[0071] The above-mentioned slurry T1 and slurry B1 are coated on the first surface of the negative electrode current collector at the same time, wherein the slurry T1 is coated on the first coating area of ​​the negative electrode current colle...

Embodiment 2

[0077] Embodiment 2 differs from Embodiment 1 in that:

[0078] In step (1), 47.5 g of hard carbon and 47.5 g of silicon oxide were used to prepare lithium ion battery C2.

Embodiment 3

[0080] Embodiment 3 differs from Embodiment 1 in that:

[0081] In step (1), 57g of hard carbon and 38g of silicon oxide were used to prepare lithium ion battery C3.

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Abstract

The invention provides a negative pole piece and a lithium ion battery comprising the negative pole piece. According to the negative pole piece, a first coating area with better quick charging performance and higher mass capacity is arranged on the surface of a negative current collector close to one side of a negative pole lug; a second coating area is arranged on the surface of the negative current collector away from one side of the negative pole lug; the negative pole piece can well solve the problem of lithium precipitation on the surface of the negative pole piece close to one side of the negative pole lug, is also suitable for the lithium ion battery in the high-rate charging process, solves the problem of lithium precipitation on the surface of the negative pole piece on one side of the negative pole lug. And the endurance performance of the lithium ion battery can be improved. Meanwhile, the preparation method of the negative pole piece is simple, and the preparation cost is low: materials used for preparing the negative pole piece are large-scale commercial materials, so that the cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative pole piece and a lithium ion battery including the negative pole piece. Background technique [0002] Due to the advantages of high energy density, long cycle life, no memory effect and environmental friendliness, lithium-ion batteries are widely used in portable electronic products, energy storage devices and new energy vehicles. However, it takes several hours to fully charge a lithium-ion battery, which seriously restricts the further development of lithium-ion batteries. Therefore, fast charging technology is one of the important development directions of lithium-ion batteries in the future. Lithium deposition on the surface edge of the negative electrode sheet is a problem often encountered in the fast charging process of lithium-ion batteries. On the one hand, metal lithium will be precipitated on the surface edge of the negative electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M10/0525H01M2004/027Y02E60/10
Inventor 叶璐申红光
Owner ZHUHAI COSMX POWER CO LTD
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