▎ 摘　　要

NOVELTY - Preparation of silicon/graphene/carbon composite anode material, involves (i) uniformly dispersing silicon nanoparticles in anhydrous ethanol under ultrasonic treatment, and forming silicon nanoparticle dispersion, (ii) adding aminopropyltrimethoxysilane to silicon nanoparticle dispersion, stirring, (iii) centrifuging dispersion and drying to obtain aminopropyltrimethoxysilane modified silicon nanoparticles, dispersing in anhydrous ethanol, dripping into graphene solution while stirring, centrifuging and freeze-drying to obtain silicon nanoparticle/graphene composite material. USE - Preparation of silicon/graphene/carbon composite anode material. ADVANTAGE - The silicon/graphene/carbon composite anode material has high specific discharge capacity, excellent charge-discharge characteristics and high cycle stability. The silicon/graphene/carbon composite anode material is prepared easily in a simple manner. DETAILED DESCRIPTION - Preparation of silicon/graphene/carbon composite anode material, involves (i) uniformly dispersing silicon nanoparticles in anhydrous ethanol under ultrasonic treatment, and forming silicon nanoparticle dispersion, (ii) adding aminopropyltrimethoxysilane to the silicon nanoparticle dispersion, stirring to perform surface modification treatment of silicon, (iii) centrifuging the dispersion obtained in step (ii) and drying to obtain aminopropyltrimethoxysilane modified silicon nanoparticles, dispersing aminopropyltrimethoxysilane modified silicon nanoparticles in anhydrous ethanol to form a dispersion, dripping into graphene solution while stirring, carrying out centrifugation, freeze-drying to obtain silicon nanoparticle/graphene composite material, (iv) uniformly mixing silicon nanoparticle/graphene composite material with polyvinylidene fluoride and then coating onto a copper current collector to form a uniform thickness composite material and drying in a vacuum drying oven, (v) subjecting dried composite material to high-temperature heat treatment in an inert atmosphere to obtain silicon/graphene/carbon composite anode material.