▎ 摘　　要

NOVELTY - Method for preparing graphene-based negative electrode material involves (i) modifying niobium and tin doped graphene with 7-octenyltrichlorosilane to obtain silanized graphene, (ii) reacting the silanized graphene with 4-bromo-2-(2-nitro-1-propenyl)thiophene to obtain modified graphene, (iii) using modified graphene and 2-vinylthiophene as raw material, and using polymerization reaction to obtain the product, where the mass ratio of niobium and tin doped graphene is made from niobium pentachloride, tin tetrachloride and liquid polyacrylonitrile in (0.01-0.02):(0.03-0.05):1 as raw materials. USE - The method is useful for preparing graphene-based negative electrode material for lithium ion battery (claimed). ADVANTAGE - The electrode material has high coulombic efficiency, high specific capacity, and excellent cycle performance.