▎ 摘　　要

NOVELTY - Carbon nanotube/graphene/silicon composite lithium battery cathode material comprises a foamed nickel, and a graphene layer and a silicon-blended carbon nanotube layer alternately arranged on the foamed nickel, and a thick graphene protective layer covered on the uppermost layer, which is graphene layer. The number of silicon layers is 1-15 (n), and the number of graphene layers is n+1. USE - Carbon nanotube/graphene/silicon composite lithium battery cathode material (claimed). ADVANTAGE - The carbon nanotube/graphene/silicon composite lithium battery cathode material has excellent cycle performance and mechanical property due to the presence of graphene and carbon nanotubes, and high conductivity due to the presence of the silicon powder and capacity. The carbon nanotube/graphene/silicon composite lithium battery cathode material can be prepared by simple, economical and reproducible method, and forms stable surface solid electrolyte membrane and has high intrinsic conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of carbon nanotube/graphene/silicon composite lithium battery anode material, which involves pressing a foamed nickel into a wafer, cleaning, adding a graphene oxide powder to absolute ethanol, ultrasonically dispersing for 30-60 minutes, obtaining 0.5-2 M graphene oxide solution (A) and 2-4 M graphene oxide solution (B), cleaning nano-silicon, adding nano-silica to a mixed solution of ethanol and ethylene glycol in a volume ratio of 9:1, obtaining 1-2 M silicon dispersion solution, adding hydroxylated carbon nanotubes having concentration of 0.01-2 M to the silicon dispersion solution, ultrasonically dispersing for 30-120 minutes, obtaining a silicon/carbon nanotube composite dispersion solution, immersing the foamed nickel in the graphene oxide solution (A), drying in an inert atmosphere at 60-90 degrees C for 10-15 minutes, immersing the obtained foamed nickel in the silicon/carbon nanotube composite dispersion solution, drying in an inert atmosphere at 60-90 degrees C for 5-10 minutes, preparing silicon/carbon nanotube composite network layer (where number of layers is n), pressing into thin sheets using a tablet machine at 8-10 MPa, placing the resultant product in graphene oxide solution (B), soaking for 30-60 minutes, drying, placing the obtained thin sheets in a vacuum tube furnace, and calcining at 550-650 degrees C for 2 hours in argon.