▎ 摘　　要

NOVELTY - A graphene/manganomanganic oxide composite material is prepared by mixing 1-2 g graphite powder and 20-40 mL concentrated sulfuric acid, adding 100-200 mg sodium nitrate to the mixture, stirring in water bath, adding 1-3 g potassium permanganate, adding 4-5 mg/mL oxidized graphene dispersion liquid dispersed in an ethanol-water mixed solvent, and manganese acetate tetrahydrate, such that the mass ratio of the oxidized graphene to the manganese acetate tetrahydrate is 1:1-1:30, and reacting at 160-200 degrees C for 8-12 hours. USE - Graphene/manganomanganic oxide composite material is used in supercapacitor, battery, automobile and military facility. ADVANTAGE - The graphene/manganomanganic oxide composite material can be prepared by easy and economical method, without requiring special equipment. DETAILED DESCRIPTION - A graphene/manganomanganic oxide composite material is prepared by mixing 1-2 g graphite powder and 20-40 mL concentrated sulfuric acid, adding 100-200 mg sodium nitrate to the mixture, stirring in water bath, adding 1-3 g potassium permanganate, adding 4-5 mg/mL oxidized graphene dispersion liquid dispersed in an ethanol-water mixed solvent, and manganese acetate tetrahydrate, such that the mass ratio of the oxidized graphene to the manganese acetate tetrahydrate is 1:1-1:30, and reacting at 160-200 degrees C for 8-12 hours. The graphite powder, concentrated sulfuric acid, sodium nitrate, potassium permanganate and manganese acetate tetrahydrate are used as matrix materials, and the advanced Hummers' method is adopted for preparing oxidized graphene. The solvothermal method is adopted for preparing the graphene and manganomanganic oxide composite material. An INDEPENDENT CLAIM is included for preparation of graphene/manganomanganic oxide composite material.