▎ 摘　　要

NOVELTY - Preparation of sodium ion battery selenium-ferrous/graphene anode composite material comprises adding graphene oxide and cationic polyelectrolyte in water, ultrasonically dispersing, stirring, centrifuging, drying to obtain modified graphene oxide, adding into water, and ultrasonically dispersing to obtain modified graphene oxide dispersion liquid; adding iron source solution and continuously stirring; and adding selenium solution, stirring, adding reducing agent, stir-heating, hydrothermal reacting, washing, and drying. USE - Method for preparing sodium ion battery selenium-ferrous/graphene anode composite material. ADVANTAGE - The composite material has high specific capacity and excellent cycle performance and capacity reversibility. The method has simple preparation method and low cost.