▎ 摘　　要

NOVELTY - Preparing biomass/graphene oxide carbon composite material involves drying biomass is ball-milled as reactant A. The multi-layer graphene oxide is mixed with dilute acid to get mixed liquid, which is used as reactant B. The reactant A and reactant B are mixed and dispersed uniformly, and then processed by microwave-assisted hydrothermal method, and finally dried to obtain biomass/graphene oxide carbon composite material. USE - Method for preparing biomass/graphene oxide carbon composite material used in preparing electrode materials for supercapacitors. ADVANTAGE - The method enables to prepare biomass/graphene oxide carbon composite material in a simple manner, does not need to add a binder and conductive agent, and composite material has high conductivity, high specificcapacity and good rate performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing electrode material, which involves compressing biomass/graphene oxide carbon composite material to obtain a multi-level channel sheet sandwich structure composite material, and the sheet sandwich structure is prepared by the composite material is used in the supercapacitor under the three-electrode system.