▎ 摘　　要

NOVELTY - A graphene-coated porous silicon composite material is prepared by dispersing graphene oxide in acid solution with pH value of 1-4 to obtain graphene oxide dispersion, mixing with aluminum-silicon alloy powder to prepare graphene-coated alloy particles, and etching. USE - Method for preparing graphene-coated porous silicon composite materials used as anode material for lithium ion battery (claimed). ADVANTAGE - The product has high first charge and discharge efficiency and good cycle performance, has high safety performance, and is used in consumer electronics and electric vehicles. The method is simple, easy to control, and is suitable for industrialization.