▎ 摘　　要

NOVELTY - Preparation of surface porous manganese carbonate cubic/graphene composite material comprises mixing potassium permanganate solution with glucose solution, stirring, hydrothermally reacting at 160-180 degrees C to obtain manganese carbonate suspension, centrifuging, and drying; and adding olid powder of manganese carbonate to the graphene oxide aqueous solution, ultrasonically stirring, hydrothermally reacting at 160-180 degrees C, and freeze-drying. USE - The method is used for preparing surface porous manganese carbonate cubic/graphene composite material. ADVANTAGE - The composite material has improved conductivity and chemical stability of the surface porous manganese carbonate, alleviates volume expansion of the battery during the charge and discharge process, and increases capacity of the material and the stability under high current.