US 11,851,332 B2
Silicon-carbon composite material and preparation method thereof
Luo Yan, Guangdong (CN); Anhua Zheng, Guangdong (CN); and Yongjun Yang, Guangdong (CN)
Assigned to Guangdong Kaijin New Energy Technology Co., Ltd., Dongguan (CN)
Filed by Guangdong Kaijin New Energy Technology Co., Ltd., Dongguan (CN)
Filed on Jun. 10, 2021, as Appl. No. 17/343,763.
Application 17/343,763 is a continuation of application No. PCT/CN2019/082319, filed on Apr. 11, 2019.
Claims priority of application No. 201910069128.6 (CN), filed on Jan. 24, 2019.
Prior Publication US 2022/0048774 A1, Feb. 17, 2022
Int. Cl. C01B 32/194 (2017.01); C01B 33/021 (2006.01); C23C 16/22 (2006.01); C23C 16/455 (2006.01); C23C 16/52 (2006.01); C23C 16/56 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01)
CPC C01B 32/194 (2017.08) [C01B 33/021 (2013.01); C23C 16/22 (2013.01); C23C 16/45553 (2013.01); C23C 16/52 (2013.01); C23C 16/56 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/61 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A silicon-carbon composite material, comprising:
a matrix core;
a silicon-carbon composite shell which is formed by uniformly dispersing a plurality of nano silicon particles in conductive carbon; and
a coating layer which is a carbon coating layer including at least one layer, a thickness of a single layer of the coating layer being 0.2-3 μm;
wherein the nano silicon particles are formed by high-temperature pyrolysis of a silicon source, and the conductive carbon is formed by high-temperature pyrolysis of an organic carbon source;
wherein the silicon-carbon composite material has a particle size D50 of 2-20 μm, a specific surface area of 1-30 m2/g, and a true density of 1-3 g/cm3, and a particle size D50 of the matrix core of the silicon-carbon composite material is 2-18 μm.