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 |
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.
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