▎ 摘　　要

NOVELTY - A manganese dioxide graphite composite electrode material is prepared by mixing graphene oxide, potassium permanganate solution and citric acid ultrasonically until obvious particle disappears. The mixed solution is heated to obtain graphene oxide-manganese composite material colloidal solution. The colloidal solution is reduced by heating de-ionized water ultrasonically to obtain oxidized colloidal solution, which is heated with water containing callose and refluxed to complete reaction followed by washing, filtering and drying process to obtain black graphene manganese composite material. USE - Manganese dioxide graphite composite electrode material for use as supercapacitor electrode material. ADVANTAGE - The material improves performance of supercapacitor.