▎ 摘　　要

NOVELTY - Preparation of iron-doped cobalt diselenide nanosheet/reduced graphene composite electrode material comprises dispersing graphene oxide in mixed solvent and ultrasonically dispersing to obtain graphene oxide dispersion; adding cobalt salt and iron salt to graphene oxide dispersion liquid, and stirring to obtain mixed dispersion liquid; and adding selenium salt to mixed dispersion, stirring, soaking, heating, centrifuging, washing and drying. USE - The method is used for preparing iron-doped cobalt diselenide nanosheet/reduced graphene composite electrode material. ADVANTAGE - The method is simple, uses low-cost transition metal salt as precursor, and adopts one-step solvothermal method to optimize structure and composition of material to prepare and obtain iron-doped cobalt diselenide nanosheets and their composite with graphene material, as the negative electrode material of sodium ion battery. The material has high specific capacity, good rate performance, and long cycle life.