▎ 摘　　要

NOVELTY - Three-dimensional graphene porous silicon composite negative electrode material comprises a three-dimensional structure composed of graphene and nanoporous silicon particles uniformly dispersed in the three-dimensional structure, where the particle size of nanoporous silicon particles is 1-200 nm, and the amount of nanoporous silicon particles is 5-95 wt.%. USE - Three-dimensional graphene porous silicon composite negative electrode material used in preparation of lithium ion batteries (claimed). ADVANTAGE - The anode material shows the excellent electrochemical performance, can optimally maintain a high specific capacity of 1131 mAh/g after 500 cycles when the current density is 600 mA/g. The preparation method of material is simple, low cost, has excellent performance, and is suitable for industrialization promotion. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) Preparation of three-dimensional graphene porous silicon composite negative electrode material which involves (1) uniformly dispersing nano-silicon dioxide particles in the graphene oxide aqueous solution by ultrasonic, stirring and mixing after adding magnesium powder, freeze-drying the mixed solution, (2) calcining freeze-dried product at high temperature in an oxygen-free atmosphere to reduce graphene oxide and silica, and washing the calcined product and again freeze-drying; and (2) Application of three-dimensional graphene porous silicon composite negative electrode material in preparation of lithium ion batteries.