Title:
PREPARATION METHOD FOR HIGH-FIRST-EFFICIENCY LONG-LIFE SILICON-CARBON CATHODE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2019/024221
Kind Code:
A1
Abstract:
A preparation method for a high-first-efficiency long-life silicon-carbon cathode material: first heating, mixing, sieving and grading SiOX and asphalt, to obtain an SiOX/C material; then using aluminum nitrate, urea and SiOX/C to prepare a precursor Al(OH)3-SiOX/C; finally, obtaining an Al2O3-SiOX/C material by means of heat treatment. With the present invention, carbon cladding treatment is firstly performed on the SiOX to alleviate a volume effect generated during electrical charging and discharging of the SiOX, and the process is simple, with low manufacturing costs and high yield. The Al2O3 cladding layer may effectively reduce contact between an electrolyte and SiOX and between the electrolyte and the carbon layer, thus reducing the side reaction of the material and the electrolyte, while reducing formation of an SEI film. In addition, the Al2O3 cladding layer may act as an SEI film, which conducts Li+ but does not conduct electrons, and which may also increase Li+ migration speed.
Inventors:
DONG XINYI (CN)
HE JINXIN (CN)
ZHENG YUANYUAN (CN)
JIN CHENYOU (CN)
MIAO YONGHUA (CN)
XUE CHI (CN)
HE JINXIN (CN)
ZHENG YUANYUAN (CN)
JIN CHENYOU (CN)
MIAO YONGHUA (CN)
XUE CHI (CN)
Application Number:
PCT/CN2017/104193
Publication Date:
February 07, 2019
Filing Date:
September 29, 2017
Export Citation:
Assignee:
ZHONGTIAN ENERGY STORAGE TECH CO LTD (CN)
International Classes:
H01M4/1391; H01M4/48; H01M4/587
Foreign References:
CN103606660A | 2014-02-26 | |||
CN104854740A | 2015-08-19 | |||
CN102593426A | 2012-07-18 | |||
CN101752547A | 2010-06-23 | |||
CN106328900A | 2017-01-11 |
Attorney, Agent or Firm:
SHENZHEN SCIENBIZIP INTELLECTUAL PROPERTY AGENCY CO.,LTD. (CN)
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