▎ 摘　　要

NOVELTY - Sulfur and oxygen co-doped biomass carbon / graphene composite material is composed of a biomass carbon / graphene matrix and sulfur doped in the biomass carbon / graphene matrix, It is composed of oxygen and has a cauliflower structure. The cauliflower structure is composed of undulating multi-fold sheets with a thickness of 20-30 nm. USE - Sulfur and oxygen co-doped biomass carbon / graphene composite material for electrochemical energy storage. ADVANTAGE - Sulfur and oxygen co-doped biomass carbon / graphene composite material has large specific surface area, good conductivity and excellent storage performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing sulfur and oxygen co-doped biomass carbon / graphene composite material, which involves: (A) dispersing the biomass material in pre-cooled sodium hydroxide / urea / aqueous solution; (B) stirring, centrifuging and defoaming in order to obtain a transparent solution; (C) dispersing the transparent solution obtained in the graphene oxide solution; (D) adding dodecylbenzenesulfonic acid; (E) stirring at room temperature; and (F) pickling out by acid washing.