NEGATIVE ELECTRODE SHEET, PREPARATION METHOD THEREFOR, AND LITHIUM ION BATTERY COMPRISING SAME

Title:

NEGATIVE ELECTRODE SHEET, PREPARATION METHOD THEREFOR, AND LITHIUM ION BATTERY COMPRISING SAME

Document Type and Number:

WIPO Patent Application WO/2022/022520

Kind Code:

A1

Abstract:

Provided are a negative electrode sheet, a preparation method therefor, and a lithium ion battery comprising the negative electrode sheet. The negative electrode sheet comprises a negative current collector, a first negative electrode active material layer, a second negative electrode active material layer and a negative electrode tab, wherein the negative electrode tab is arranged on the surface of one side of the negative current collector, the first negative electrode active material layer is coated on the surface, close to the negative electrode tab, of one side of the negative current collector with the negative electrode tab, and the second negative electrode active material layer is coated on the surface, away from the negative electrode tab, of one side of the negative current collector with the negative electrode tab; and the first negative electrode active material layer comprises a first negative electrode active material, and the second negative electrode active material layer comprises a second negative electrode active material. The negative electrode sheet of the present invention can effectively improve the lithium precipitation phenomenon at the tab position of a lithium ion battery with an STP structure and improve the cycle life of the lithium ion battery; meanwhile, the problem of battery cell lithium precipitation and deformation caused by lithium precipitation can also be effectively alleviated.

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Inventors:

JIN DANDAN (CN)
PENG CHONG (CN)
LI JUNYI (CN)
XU YANMING (CN)

Application Number:

PCT/CN2021/108700

Publication Date:

February 03, 2022

Filing Date:

July 27, 2021

Export Citation:

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Assignee:

ZHUHAI COSMX BATTERY CO LTD (CN)

International Classes:

H01M4/133; H01M4/1393; H01M10/0525

Foreign References:

CN111916668A	2020-11-10
CN112420984A	2021-02-26
CN109980177A	2019-07-05
CN110148777A	2019-08-20
JP2014132541A	2014-07-17
CN202010733533A	2020-07-27

Attorney, Agent or Firm:

LEADER PATENT & TRADEMARK FIRM (CN)

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