▎ 摘　　要

NOVELTY - Graphene-based sodium ion battery negative electrode material is formed by combining titanium dioxide and lignin hard carbon, and compounding with graphene to form secondary spherical particles, where the graphene content is 5-15 %mass, the mass ratio of the titanium dioxide to the lignin hard carbon is (1-2):1, and the graphene comprises single layer or multiple layers (less than ten layers). USE - As graphene-based sodium ion battery negative electrode material. ADVANTAGE - The electrode material increases the discharge specific capacity of lignin hard carbon, and improves the electronic conductivity of titanium dioxide doped lignin hard carbon through the composite of graphene, enhance the rate performance of the negative electrode material, has the secondary spherical structure to prevent the particles from breaking during the charge and discharge process, and improves the cycle stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the graphene-based sodium ion battery negative electrode material, involving (i) adding lignin to tetrabutyl titanate, ultrasonically dispersing, and adding graphene aqueous solution to obtain a mixed solution, and (ii) spray-drying and granulating the mixed solution under agitation, performing heat treatment in an inert atmosphere at a certain temperature for a certain time to obtain the product.