▎ 摘　　要

NOVELTY - A porous silicon/titanium dioxide/graphene composite material comprises titanium dioxide-coated porous silicon composite material and reduced graphene oxide supported on titanium dioxide-coated porous silicon composite material. The reduced graphene oxide is doped with a strong electronegative element. USE - Porous silicon/titanium dioxide/graphene composite material used in cathode for lithium-ion battery (all claimed). ADVANTAGE - The composite material is prepared using inexpensive raw material, and has high lithium storage property, excellent cycle stability and high specific capacity, and provides battery with excellent rate performance and safety performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the porous silicon/titanium dioxide/graphene composite material, which involves dissolving silicon alloy powder in solvent under action of alkaline condition, adding titanium source, mixing, removing the solvent, drying, sintering and pickling to obtain titanium dioxide-coated porous silicon composite material, ultrasonically processing small molecules and graphene oxide, drying, heat-treating to obtain reduced graphene oxide doped with strongly electronegative elements, ultrasonically processing titanium dioxide-coated porous silicon composite material in solution of reduced graphene oxide, and drying. The small molecules are compounds containing strong electronegative elements.