US 12,341,191 B2
Composite negative electrode material and preparation method therefor and lithium battery
Chunlei Pang, Guangdong (CN); Yiming Kong, Guangdong (CN); Tengyu Liang, Guangdong (CN); Jianguo Ren, Guangdong (CN); and Xueqin He, Guangdong (CN)
Assigned to BTR NEW MATERIAL GROUP CO., LTD., Guangdong (CN); and DINGYUAN NEW ENERGY TECHNOLOGY CO., LTD., Guangdong (CN)
Appl. No. 17/616,080
Filed by BTR NEW MATERIAL GROUP CO., LTD., Guangdong (CN); and DINGYUAN NEW ENERGY TECHNOLOGY CO., LTD., Guangdong (CN)
PCT Filed Sep. 25, 2020, PCT No. PCT/CN2020/117889
§ 371(c)(1), (2) Date Dec. 2, 2021,
PCT Pub. No. WO2021/057923, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 201910918320.8 (CN), filed on Sep. 26, 2019.
Prior Publication US 2022/0320505 A1, Oct. 6, 2022
Int. Cl. H01M 4/48 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/48 (2013.01) [H01M 4/0428 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A composite negative electrode material, comprising silicon-containing particles and a carbon covering layer, wherein the carbon covering layer covers at least part of surface of the silicon-containing particles,
wherein in a Raman spectrum, the composite negative electrode material has a characteristic peak A of silicon between 450 cm−1 and 550 cm−1, a characteristic peak B of carbon between 1300 cm−1 and 1400 cm−1, a characteristic peak C of carbon between 1530 cm−1 and 1630 cm−1, and a characteristic peak D of graphene structure between 2500 cm−1 and 2750 cm−1, a ratio IA/ID of a peak intensity IA of the characteristic peak A of silicon to a peak intensity ID of the characteristic peak D of graphene structure is greater than 1 and less than 30, and a ratio ID/IB of the peak intensity ID of the characteristic peak D of graphene structure to a peak intensity IB of the characteristic peak B of carbon is greater than 0 and less than 1.