Title:
SILICON-BASED NEGATIVE ELECTRODE MATERIAL OF LITHIUM ION BATTERY AND PREPARATION METHOD THEREFOR, AND BATTERY
Document Type and Number:
WIPO Patent Application WO/2020/042577
Kind Code:
A1
Abstract:
Disclosed in the present invention are a silicon-based negative electrode material of a lithium ion battery and a preparation method therefor, and a battery. The silicon-based negative electrode material is prepared by the compounding of 90 wt%-99.9 wt% of a silicon-based material and 0.1 wt%-10 wt% of carbon nanotubes and/or carbon nanofibers which grow on the surface of the silicon-based material in situ; the silicon-based material is a powder material containing electrochemical active silicon and comprises one or a mixture of more of a nano silicon-carbon composite material, a silicon monoxide material, a modified silicon monoxide material and an amorphous silicon alloy, wherein the electrochemical active silicon accounts for 0.1 wt%-90 wt% of the silicon-based material; the carbon nanotubes comprise a single-walled carbon nanotube and/or a multi-walled carbon nanotube; the diameter of the carbon nanotubes and/or carbon nanofibers is 0.4-50 nm, the length is 10 nm-50 μm; a Raman spectrum of the silicon-based negative electrode material of the lithium ion battery has an amorphous bump at 475±10 cm-1, and/or has a crystalline peak at 510±10 cm-1; when the single-walled carbon nanotube is comprised, there is an RBM in a range of 100-400 cm-1; and an XRD spectrum of the silicon-based negative electrode material of the lithium ion battery has a diffraction peak at 28.4 degrees±0.2 degrees.
Inventors:
LUO FEI (CN)
LIU BONAN (CN)
CHU GENG (CN)
LU HAO (CN)
LIU BONAN (CN)
CHU GENG (CN)
LU HAO (CN)
Application Number:
PCT/CN2019/077119
Publication Date:
March 05, 2020
Filing Date:
March 06, 2019
Export Citation:
Assignee:
TIANMULAKE EXCELLENT ANODE MAT CO LTD (CN)
International Classes:
H01M4/58; H01M4/04; H01M4/62
Foreign References:
| CN101540390A | 2009-09-23 | |||
| CN1812168A | 2006-08-02 | |||
| CN108023072A | 2018-05-11 | |||
| CN108183201A | 2018-06-19 | |||
| CN102185128A | 2011-09-14 | |||
| CN201810978803A | 2018-08-27 |
Other References:
"Effect of Volume Expansion on SEI Covering Carbon-Coated Nano-Si/SiO Composite", JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 160, no. 10
See also references of EP 3846249A4
See also references of EP 3846249A4
Attorney, Agent or Firm:
RECHWISE PATENT & TRADEMARK FIRM (CN)
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