SILICON-BASED NEGATIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR, BATTERY, AND TERMINAL

WIPO Patent Application WO/2021/136376

A1

Disclosed are a silicon-based negative electrode material (10) and a preparation method therefor, as well as a battery and a terminal (200) comprising the silicon-based negative electrode material (10). The silicon-based negative electrode material (10) comprises a silicon-based matrix (1) having a low silicon-to-oxygen ratio and silicon-based particles (2) having a high silicon-to-oxygen ratio dispersed therein. The silicon-to-oxygen ratio in the silicon-based matrix (1) having a low silicon-to-oxygen ratio is 1:x, where 1 < x ≤ 2, and the silicon-to-oxygen ratio in the silicon-based particles (2) having a high silicon-to-oxygen ratio is 1:y, where 0 ≤ y ≤ 1. The silicon-based matrix (1) having a low silicon-to-oxygen ratio is silicon dioxide (11), or comprises silicon dioxide (11) and silicon-containing crystal particles (12) dispersed in the silicon dioxide (11); and the silicon-based particles (2) having a high silicon-to-oxygen ratio are silicon particles, or comprise silicon dioxide (11) and silicon-containing crystal particles (12) dispersed in the silicon dioxide (11). The silicon-based negative electrode material (10) has a high capacity and a low expansion property at the same time.

LEI DAN (CN)
SHA YUJING (CN)
DENG YAOMING (CN)
XIA SHENGAN (CN)

PCT/CN2020/141408

July 08, 2021

December 30, 2020

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HUAWEI TECH CO LTD (CN)

H01M4/36

WO2019144026A1

2019-07-25

CN105409035A	2016-03-16
CN101047234A	2007-10-03
CN102214824A	2011-10-12
CN1513922A	2004-07-21
CN201911425863A	2019-12-31

See also references of EP 4071852A4

SCIHEAD IP LAW FIRM (CN)

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