Patent ID: 11894549
Assignee: GUANGDONG KAIJIN NEW ENERGY TECHNOLOGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A three-dimensional porous silicon/carbon composite material, comprising a three-dimensional porous skeleton, a filler layer, and a coating layer, wherein the three-dimensional porous skeleton is a three-dimensional porous carbon skeleton, the filler layer comprises silicon particles and conductive carbon, the filler layer is formed by scattering the silicon particles evenly and dispersively in the conductive carbon, and the coating layer is a carbon coating layer;
wherein the three-dimensional porous silicon/carbon composite material is prepared by:
preparing the three-dimensional porous carbon skeleton;
placing the three-dimensional porous carbon skeleton in a reactor, and depositing silicon particles and conductive carbon in the three-dimensional porous carbon skeleton by alternate vapor deposition in a protective atmosphere at a rate of 0.5-20 L/min to obtain a precursor A of the silicon-carbon composite material, wherein the alternate vapor deposition is performed at a temperature of 400-1000° C. for a duration of 0.5-20 h;
performing carbon coating on the precursor A of the silicon/carbon composite material to prepare a precursor B of the silicon/carbon composite material; and
sintering the precursor B of the silicon/carbon composite material to prepare the three-dimensional porous silicon/carbon composite material;
wherein the alternate vapor deposition comprises:
mixing a silicon source with the protective atmosphere at a ratio B and introducing a resultant mixture into a reactor for 5-600 seconds for vapor deposition of nano-silicon; and
mixing an organic carbon source with the protective atmosphere at a ratio C and introducing another resultant mixture into the reactor for 5-600 seconds for vapor deposition of the conductive carbon;
wherein constant alternate introduction is accomplished by a solenoid valve, the ratio B comprises a flow ratio of 1:1-1:20 between the silicon particles to the protective atmosphere, and the ratio C comprises a flow ratio of 1:1-1:20 between the organic carbon source and the protective atmosphere.