US 12,494,481 B2
Core-shell composite negative electrode material, preparation method therefor and use thereof
Peng He, Guangdong (CN); Eming Guo, Guangdong (CN); Jianguo Ren, Guangdong (CN); and Xueqin He, Guangdong (CN)
Assigned to BTR NEW MATERIAL GROUP CO., LTD., Guangdong (CN)
Appl. No. 17/286,435
Filed by BTR NEW MATERIAL GROUP CO., LTD., Guangdong (CN); and DINGYUAN NEW ENERGY TECHNOLOGY CO., LTD., Guangdong (CN)
PCT Filed May 15, 2020, PCT No. PCT/CN2020/090681
§ 371(c)(1), (2) Date Apr. 16, 2021,
PCT Pub. No. WO2020/228829, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 201910411238.6 (CN), filed on May 16, 2019.
Prior Publication US 2021/0391569 A1, Dec. 16, 2021
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/1393 (2010.01); H01M 4/1395 (2010.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/1393 (2013.01); H01M 4/1395 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A core-shell type composite negative electrode material, wherein the core-shell type composite negative electrode material comprises:
an inner core which is formed of a first active substance and a second active substance, and
a carbon coating outer shell acting as a third active substance,
wherein the first active substance is a sheet-like silicon-based material, and the second active substance is a sheet-like graphite material; and
wherein an aspect ratio of a particle of the sheet-like graphite material is larger than 2 and less than or equal to 120, wherein an aspect ratio of a particle of the sheet-like silicon-based material is larger than 15 and less than or equal to 100, the aspect ratio of the particle is a ratio of maximum linearity to minimum linearity of the particle, wherein the maximum linearity of a sheet-like material is a maximum length of a two-dimensional plane of the sheet-like material, and the minimum linearity is a thickness of the sheet-like material;
wherein the first active substance is a mixture of Si and SiOx in a mass ratio of 0.01-100, wherein 0.5≤x≤1.5, a median particle size of Si is 10-300 nm, a median particle size of SiOx is 150-5000 nm, and the median particle size of Si is smaller than the median particle size of SiOx; or
the first active substance is a mixture of Si and the Si-M alloy in a mass ratio of 0.01-100, wherein M is any one of B, Fe, Cu, Sn, Ge, Ti, Mg, Ni and Ce or a combination at least two thereof, a median particle size of Si is 10-300 nm, a median particle size of the Si-M alloy is 150-5000 nm, and the median particle size of Si is smaller than the median particle size of the Si-M alloy; or
the first active substance is a mixture of SiOx and the Si-M alloy in a mass ratio of 0.01-100, wherein 0.5≤x≤1.5, M is any one of B, Fe, Cu, Sn, Ge, Ti, Mg, Ni and Ce or a combination at least two thereof, a median particle size of SiOx is 150-400 nm, a median particle size of the Si-M alloy is 200-5000 nm, and the median particle size of SiOx is smaller than the median particle size of the Si-M alloy; or
the first active substance is a mixture of SiOx and the Si-M alloy in a mass ratio of 0.01-100, wherein 0.5≤x≤1.5, M is any one of B, Fe, Cu, Sn, Ge, Ti, Mg, Ni and Ce or a combination at least two thereof, a median particle size of the Si-M alloy is 150˜400 nm, a median particle size of SiOx is 200-5000 nm, and the median particle size of the Si-M alloy is smaller than the medium particle size of SiOx.