SILICON-CARBON COMPOSITE MATERIAL AND PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

Title:

SILICON-CARBON COMPOSITE MATERIAL AND PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

Document Type and Number:

WIPO Patent Application WO/2022/105279

Kind Code:

A1

Abstract:

A silicon-carbon composite material and a preparation method therefor and an application thereof. The silicon-carbon composite material comprises an inner core and a carbon cladding layer, and at least a portion of the surface of the inner core is covered by the carbon cladding layer; the inner core comprises a carbon matrix and SiOx particles, the carbon matrix is continuously distributed and comprises N pore channels communicated with the outside, and the SiOx particles are filled in the pore channels, wherein the size of the SiOx particles is 0.1-0.9 nm, 0.9≤x≤1.7, and N is greater than or equal to 1 and is an integer. By adjusting the structure and composition of the silicon-carbon composite material, the defects of poor stability and poor electrical conductivity of silicon-based materials can be overcome, so that a secondary battery has excellent energy density, and also performs well in cycling performance, rate performance, and fast charging performance.

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Inventors:

SHA YUJING (CN)
YU RUOHAN (CN)
XIA SHENGAN (CN)
LI YANGXING (CN)
ZHOU LIANG (CN)

Application Number:

PCT/CN2021/107112

Publication Date:

May 27, 2022

Filing Date:

July 19, 2021

Export Citation:

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Assignee:

HUAWEI TECH CO LTD (CN)

International Classes:

H01M4/36

Foreign References:

CN107623109A	2018-01-23
CN108428876A	2018-08-21
CN111755683A	2020-10-09
CN106030871A	2016-10-12
CN106129411A	2016-11-16
CN103682359A	2014-03-26
CN105655564A	2016-06-08
CN202011306499A	2020-11-20
CN102214823A	2011-10-12
CN106816594A	2017-06-09
CN107093711A	2017-08-25

Other References:

"Crystalline-amorphous core-shell silicon nanowires for high capacity and high current battery electrodes", NANO LETT, 2009, pages 491 - 495
"A pomegranate-inspired nanoscale design for large-volume change lithium battery anodes", NATURE NANOTECH, vol. 9, 2014, pages 187 - 192

Attorney, Agent or Firm:

LEADER PATENT & TRADEMARK FIRM (CN)

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