Title:
SILICON-BASED COMPOSITE MATERIAL AND PREPARATION METHOD THEREFOR, NEGATIVE ELECTRODE MATERIAL, AND LITHIUM-ION BATTERY
Document Type and Number:
WIPO Patent Application WO/2024/065818
Kind Code:
A1
Abstract:
The present invention provides a silicon-based composite material and a preparation method therefor, a negative electrode material, and a lithium-ion battery. The silicon-based composite material comprises a ferrosilicon alloy core layer, a first coating layer, and a second coating layer; the first coating layer covers the outer surface of the ferrosilicon alloy core layer; and the second coating layer covers the outer surface of the first coating layer away from the ferrosilicon alloy core layer, wherein the material of the first coating layer comprises carbon, and the material of the second coating layer comprises an oxide. In the present application, a ferrosilicon alloy is used as the core layer, so that a buffer matrix can be provided to relieve the volume change of silicon. In addition, in the present invention, the first coating layer and the second coating layer are sequentially provided on the outer surface of the core layer. In this way, in the present application, the structural stability of the silicon-based composite material can be further greatly improved while a battery is ensured to satisfy conventional battery electrochemical performance (such as capacity performance and first-time charging and discharging efficiency) requirements, thereby improving the cycling stability of the battery.
Inventors:
RAO YUANYUAN (CN)
CHENG CHENG (CN)
XU MAO (CN)
WANG ZHIQUAN (CN)
CHENG CHENG (CN)
XU MAO (CN)
WANG ZHIQUAN (CN)
Application Number:
PCT/CN2022/123606
Publication Date:
April 04, 2024
Filing Date:
September 30, 2022
Export Citation:
Assignee:
HEFEI GOTION BATTERY MAT CO LTD (CN)
International Classes:
H01M4/62; H01M4/38
Foreign References:
| CN111564611A | 2020-08-21 | |||
| CN108346788A | 2018-07-31 | |||
| CN101908625A | 2010-12-08 | |||
| KR20180027022A | 2018-03-14 |
Attorney, Agent or Firm:
KANGXIN PARTNERS, P.C. (CN)
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