Title:
SILICON-OXYGEN COMPOSITE NEGATIVE ELECTRODE MATERIAL AND METHOD FOR PREPARATION THEREOF AND LITHIUM-ION BATTERY
Document Type and Number:
WIPO Patent Application WO/2021/083197
Kind Code:
A1
Abstract:
The present application provides a silicon-oxygen composite negative electrode material and method for preparation thereof and lithium-ion battery. The silicon-oxygen composite negative electrode material comprises a silicon-oxygen composite negative electrode material comprising SiOx, non-Li2Si2O5 lithium-containing compound, and Li2Si2O5; said Li2Si2O5 is coated on the surface of the non-Li2Si2O5 lithium-containing compound; 0 ≤ x ≤ 1.2. The preparation method comprises: mixing a first silicon source with a reducing lithium source and roasting, to obtain a composite material containing a non-Li2Si2O5 lithium-containing compound; the composite material containing the non-Li2Si2O5 lithium-containing compound is fused with a second silicon source and then subjected to heat treatment to obtain a silicon-oxygen composite negative electrode material. The silicon-oxygen composite anode material provided by the present application is coated with Li2Si2O5, solving the problem in the prior art of a negative electrode material producing strong alkaline or easily soluble by-products in water after pre-lithiation and affecting subsequent processing.
Inventors:
PANG CHUNLEI (CN)
QU LIJUAN (CN)
DENG ZHIQIANG (CN)
REN JIANGUO (CN)
HE XUEQIN (CN)
QU LIJUAN (CN)
DENG ZHIQIANG (CN)
REN JIANGUO (CN)
HE XUEQIN (CN)
Application Number:
PCT/CN2020/124343
Publication Date:
May 06, 2021
Filing Date:
October 28, 2020
Export Citation:
Assignee:
BTR NEW MAT GROUP CO LTD (CN)
International Classes:
H01M4/485; H01M4/04
Foreign References:
| US20170117543A1 | 2017-04-27 | |||
| CN107851789A | 2018-03-27 | |||
| CN107887587A | 2018-04-06 | |||
| CN105449183A | 2016-03-30 | |||
| CN201911046596A | 2019-10-30 |
Attorney, Agent or Firm:
UNI-INTEL PATENT AND TRADEMARK LAW FIRM (CN)
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