▎ 摘　　要

NOVELTY - A multi-layer silicon/graphene composite material comprises foam nickel, a graphene layer and a silicon layer which are alternately arranged on foamed nickel and graphene layer as top layer. The number of silicon layers is 1-20. USE - Multi-layer silicon/graphene composite material is used for anode material of lithium battery. ADVANTAGE - The anode material comprising the multi-layer silicon/graphene composite material has high intrinsic conductivity and excellent cycle characteristics. DETAILED DESCRIPTION - A multi-layer silicon/graphene composite material comprises foam nickel, a graphene layer and a silicon layer which are alternately arranged on foamed nickel and graphene layer as top layer. The number of silicon layers is 1-20. The number of graphene layer is n+1 (where n is 1-20). An INDEPENDENT CLAIM is included for preparation of multi-layer silicon/graphene composite material, which involves pressing and cleaning foam nickel, adding graphene oxide powder to anhydrous ethanol and ultrasonically dispersing mixture for 30-60 minutes to obtain 1-5 M graphene solution, cleaning nanosilica, adding nanosilica to mixed solution of anhydrous ethanol and ethylene glycol in volume ratio of 9:1 to obtain silicon dispersion solution with concentration of 1-5 M, infiltrating foam nickel in graphene solution, drying foam nickel in inert atmosphere at 60-90 degrees C for 10-15 minutes, immersing foamed nickel in silicon dispersion solution, drying foamed nickel in inert atmosphere at 60-90 degrees C for 5-10 minutes, pressing product using tablet press at 8-10 MPa, adding obtained sheet to vacuum tube furnace and reducing graphene oxide in inert atmosphere at 550-650 degrees C.