Title:
NEGATIVE ELECTRODE MATERIAL, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF, AND LITHIUM-ION BATTERY
Document Type and Number:
WIPO Patent Application WO/2021/068796
Kind Code:
A1
Abstract:
The present invention relates to the field of lithium-ion batteries. Disclosed are a negative electrode material, a preparation method therefor and an application thereof, and a lithium-ion battery. The negative electrode material has a core-shell structure, in which the core comprises a silicon-containing substance, the shell comprises an organic lithium salt and a porous carbon film, and at least part of lithium ion intercalation is in the porous carbon film. The preparation method therefor comprises: (1) mixing a silicon source and a carbon source, and then roasting same; (2) mixing a roasted product obtained in step (1) with an organic lithium salt; and (3) performing vacuum freeze-drying on a material obtained by means of mixing in step (2). The negative electrode material provided by the present invention has an improved reversible charging capacity, and can improve the energy density of lithium ion batteries when applied thereto.
Inventors:
SUN SAI (CN)
ZHANG SIYU (CN)
GAO HUANXIN (CN)
ZHANG SIYU (CN)
GAO HUANXIN (CN)
Application Number:
PCT/CN2020/118720
Publication Date:
April 15, 2021
Filing Date:
September 29, 2020
Export Citation:
Assignee:
CHINA PETROLEUM & CHEM CORP (CN)
SHANGHAI RES INST PETROCHEMICAL TECH SINOPEC (CN)
SHANGHAI RES INST PETROCHEMICAL TECH SINOPEC (CN)
International Classes:
H01M4/38; H01M4/36
Domestic Patent References:
| WO2020091876A1 | 2020-05-07 | |||
| WO2020091876A1 | 2020-05-07 | |||
| WO2018146865A1 | 2018-08-16 | |||
| WO2018146865A1 | 2018-08-16 |
Foreign References:
| CN111146422A | 2020-05-12 | |||
| CN111146422A | 2020-05-12 | |||
| CN111146434A | 2020-05-12 | |||
| CN111146434A | 2020-05-12 | |||
| CN109952670A | 2019-06-28 | |||
| CN109952670A | 2019-06-28 | |||
| CN106531992A | 2017-03-22 | |||
| CN106463707A | 2017-02-22 | |||
| CN108461723A | 2018-08-28 | |||
| CN101179126A | 2008-05-14 | |||
| CN108172775A | 2018-06-15 | |||
| CN103400971A | 2013-11-20 | |||
| CN111653738A | 2020-09-11 |
Other References:
HARRIS, K. J.REEVE Z. E. M. ET AL.: "Electrochemical Changes in Lithium-Battery Electrodes Studied Using Li NMR and Enhanced C NMR of Graphene and Graphitic Carbons [J", CHEM. MATER., vol. 27, no. 9, 2015, pages 3299 - 3305
See also references of EP 4044285A4
See also references of EP 4044285A4
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (CN)
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