▎ 摘　　要

NOVELTY - Preparing biomass-graphene composite electrode material comprises (i) mixing biomass solution and liquid crystal phase graphene oxide dispersion to obtain mixed solution, (ii) assembling the mixed solution obtained in step (i) to obtain biomass-graphene oxide composite assembly material, (iii) chemically reducing and carbonizing the biomass-graphene oxide composite assembly material obtained in step (ii) to obtain biomass-graphene composite electrode material, where the biomass in the biomass solution is least two of carboxymethyl cellulose, chitosan, sodium alginate, carboxymethyl starch, dopamine hydrochloride and chitin, and the assembly processing method is wet coating or wet spinning self-fusion. USE - The biomass graphene composite electrode is used in electrocatalytic electrode materials, supercapacitors, and battery materials. ADVANTAGE - The biomass graphene composite electrode has good electrical conductivity, large specific surface area, controllable interlayer structure, and abundant active sites. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: biomass-graphene composite electrode material, prepared by above method; energy storage device; and electro-catalysis electrode material.