▎ 摘　　要

NOVELTY - Preparation of graphene-based composite negative electrode material, involves (i) sequentially adding hydrogen peroxide, nitrogen dopant and silicate to graphene oxide dispersion, mixing to obtain mixed liquid, (ii) subjecting mixed liquid to hydrothermal reaction, performing solid-liquid separation, drying solid, tableting, carbonizing in inert gas atmosphere to obtain nitrogen-doped graphene and silica composite material, (iii) adding the obtained composite material to the mixed solution of polyvinylpyrrolidone and conductive high polymer, adding reducing agent and reacting. USE - Preparation of graphene-based composite negative electrode material (claimed) for use in lithium-ion battery. ADVANTAGE - The graphene-based composite negative electrode material has high specific capacity, stable structure, and excellent electrochemical performance. DETAILED DESCRIPTION - Preparation of graphene-based composite negative electrode material, involves (i) sequentially adding hydrogen peroxide, nitrogen dopant and silicate to the graphene oxide dispersion and mixing to obtain mixed liquid, (ii) subjecting the mixed liquid to a hydrothermal reaction, then performing solid-liquid separation, drying resulting solid, tableting, carbonizing in an inert gas atmosphere to obtain nitrogen-doped graphene and silica composite material, (iii) adding nitrogen-doped graphene and silica composite material to the mixed solution of polyvinylpyrrolidone and conductive polymer, adding reducing agent, reacting at 50-120 degrees C for 1-6 hours to obtain graphene-based composite negative electrode material.