▎ 摘　　要

NOVELTY - Preparation of graphene-supported carbon coated silicon nanoparticle composite electrode material, involves mixing phenolic resin prepolymer with surface active agent, to obtain carbon precursor polymer (A), dispersing nano silicon in carbon precursor polymer (A), to obtain mixture (B), adding oxidized graphene or graphene into composite (C), to obtain mixture (D), subjecting mixture (D) to hydrothermal reaction, to obtain precursor (E), subjecting phenolic resin to carbonization to obtain carbon coating, applying carbon coating on silicon surface, and obtaining electrode material. USE - Preparation of graphene-supported carbon coated silicon nanoparticle composite electrode material. ADVANTAGE - The current density of electrode material is 100 mA.g-1, and the reversible capacity is 1800 mAh/g or more. The capacity retention rate is 70% or more. DETAILED DESCRIPTION - Preparation of graphene-supported carbon coated silicon nanoparticle composite electrode material, involves mixing phenolic resin prepolymer with surface active agent, to obtain carbon precursor polymer (A), dispersing nano silicon in carbon precursor polymer (A), to obtain mixture (B), hydrothermally treating mixture (B) at 90-180 degrees C, to obtain a composite (C), adding oxidized graphene or graphene into composite (C), and dispersing uniformly to obtain the mixture (D), subjecting mixture (D) to hydrothermal reaction at 90-180 degrees C, and carrying out solid-liquid separation, and collecting the solid particles, to obtain precursor (E), subjecting precursor (E) to heat treatment in mixed gas atmosphere containing hydrogen and argon at 500-900 degrees C, subjecting phenolic resin to high-temperature carbonization to obtain carbon coating, applying carbon coating on the silicon surface, and finally obtaining graphene-supported carbon coated silicon nanoparticle composite electrode material.