▎ 摘　　要

NOVELTY - Preparing bismuthene/graphene composite material comprises (i) placing metal bismuth powder in a container, adding solvent, carrying out ultrasonic pulverization in a cold water bath, and then collecting the supernatant by centrifuging, (ii) adding a reducing agent to the supernatant obtained in the step (i), constantly stirring, then centrifuging, washing, and vacuum freeze-drying to obtain bismuthene, (iii) dispersing the bismuthene obtained in the step (ii) into deionized water with deoxygenation, mixing with graphene oxide, uniformly dispersing ultrasonically, and performing vacuum filtration to extract the film to obtain a thin film, (iv) placing the film obtained by suction filtering into the inner lining of the reactor, and then adding a reducing agent, and reacting to obtain a bismuthene/graphene composite material. USE - The method is useful for preparing bismuthene/graphene composite material. ADVANTAGE - The method: has a large specific surface area and can be fully contacted and infiltrated with the electrolyte, and excellent flexibility of the composite material; can alleviate the volume expansion of metal bismuth during charging and discharging; and improves the rate capability and cycle stability of the material.