▎ 摘　　要

NOVELTY - A silicon-silicon carbide/graphene composite material is made of multiple sheets of silicon/silicon carbide/graphene composite structures interspersed with each other. Each silicon/silicon carbide/graphene composite structure contains a graphene layer, a silicon/silicon carbide layer provided on the upper surface of the graphene layer, and a silicon/silicon carbide layer provided on the lower surface of the graphene layer. USE - Silicon-silicon carbide/graphene composite material is used as cathode material of lithium ion battery. ADVANTAGE - The silicon-silicon carbide/graphene composite material has high structure stability and electroconductivity, buffers volume changes (by frame structure formed by interspersing horizontally and vertically) and forms three-dimensional electron/ion hybrid transmission channel which accelerates charge transfer, and stabilizes electrode/electrolyte interface. The interface between graphene and silicon-based material can stabilize the structure and enable rapid transmission of electrons and ions through chemical bonding, such that the composite material exhibits excellent lithium storage performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the silicon-silicon carbide/graphene composite material, which involves adding crosslinking agent to mixed solution of tetraethyl orthosilicate, ethanol and water, obtaining dispersion (A), adding graphene oxide to mixed solutions of tetraethyl orthosilicate, ethanol and water, obtaining dispersion (B), adding an acid solution and a hexamethylenetetramine aqueous solution to the dispersion (A) and dispersion (B), then mixing the dispersion (A) and the dispersion (B), stirring until the mixture is in a gel state, freeze-drying, mixing obtained aerogel with magnesium powder, heat-treating, acid-washing and drying.