▎ 摘　　要

NOVELTY - Preparation of porous silicon-carbon composite anode material comprises preparing nano-silicon/silicon-oxygen composites by adding nano-silicon, silane coupling agent, and dispersant sequentially to organic solvent, mixing and stirring uniformly, and spray-drying to obtain mixed powder; preparing nano-silicon/silicon-oxygen/copper composites; preparing nano silicon/silicon oxide/copper/graphene composite material by chemical vapor deposition by adding nano silicon/silicon oxide/copper composite material to vapor deposition tube furnace, placing tube furnace under protection of inert gas, passing in hydrogen/methane mixed gas, and cooling to room temperature to obtain nano-silicon/silicone/copper/graphene composite material; and putting nano-silicon/silicone/copper/graphene composite material into mixed solution of nitric acid/hydrofluoric acid, soaking, washing with secondary distilled water and vacuum drying. USE - The method is used for preparing porous silicon-carbon composite anode material. ADVANTAGE - The graphene material has strong electrical properties and high mechanical strength to reduce battery internal resistance and expansion. Formation can improve liquid holding capacity and circulation performance of material. DETAILED DESCRIPTION - Preparation of porous silicon-carbon composite anode material comprises preparing nano-silicon/silicon-oxygen composites by adding nano-silicon, silane coupling agent, and dispersant sequentially to organic solvent, mixing and stirring uniformly, and spray-drying to obtain mixed powder; preparing nano-silicon/silicon-oxygen/copper composites by magnetron sputtering by using nano-silicon/silicon-oxygen composites as substrates and copper oxides as targets, setting distance between copper at 30-50 cm, preheating pure copper backplane to 200-500 degrees C, keeping sputtering power at 10-20 W, setting deposition rate at 0.8-1.5 m/minute, and sputtering at 0.5-2 Pa for 10-120 minutes; preparing nano silicon/silicon oxide/copper/graphene composite material by chemical vapor deposition by adding nano silicon/silicon oxide/copper composite material to vapor deposition tube furnace, placing tube furnace under protection of inert gas, passing in hydrogen/methane mixed gas, and cooling to room temperature to obtain nano-silicon/silicone/copper/graphene composite material; and putting nano-silicon/silicone/copper/graphene composite material into mixed solution of nitric acid/hydrofluoric acid, soaking, washing with secondary distilled water and vacuum drying.