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 5:
6. A method for preparing a three-dimensional porous silicon/carbon composite material, comprising:
preparing a three-dimensional porous carbon skeleton M;
placing the three-dimensional porous carbon skeleton M in a reactor, and depositing silicon particles and conductive carbon in the three-dimensional porous carbon skeleton M 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.