▎ 摘　　要

NOVELTY - Quinone compound-graphene composite material comprises quinone compound and graphene. The quinone compound is chemically bonded to the graphene surface. The quinone compound is quinone compound monomer or quinone polymer. USE - The composite material is useful as cathode material in flexible lithium secondary battery (claimed). ADVANTAGE - The composite material has high energy density, high flexibility, high electrical conductivity and high stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the quinone compound-graphene composite material, comprising either (i) performing amination of quinone compound monomer using nitrification reduction method to obtain aminated quinone compound monomer-containing mixed solution, (ii) filtering aminated quinone compound monomer-containing mixed solution, washing and drying to obtain aminated quinone compound monomer, (iii) adding graphene oxide powder into the mixed acid of concentrated sulfuric acid and concentrated nitric acid, reacting at 50-60 degrees C for 5-15 hours, filtering, washing and vacuum drying to obtain carboxy surface containing graphene powder, (iv) adding aminated quinone compound monomer powder and carboxy surface containing graphene powder into water or ethanol, and ultrasonic dispersing to obtain a mixed dispersion, and (v) refluxing the mixed dispersion under a nitrogen atmosphere at 100-120 degrees C for 48-72 hours, reacting, filtering, washing, and drying to obtain quinone compound monomer-graphene composite material, or (i) performing amination of quinone compound monomer using nitrification reduction method to obtain aminated quinone compound monomer-containing mixed solution, (ii) filtering aminated quinone compound monomer-containing mixed solution, washing and drying to obtain aminated quinone compound monomer powder, (iii) adding aminated quinone compound powder into an electrolytic solution of propylene carbonate organic solvent, performing constant potential polymerization of aminated quinone compound powder using three-electrode system to obtain aminated quinone polymer, (iv) adding graphene oxide powder into the mixed acid of concentrated sulfuric acid and concentrated nitric acid, reacting at 50-60 degrees C for 5-15 hours, filtering, washing and vacuum drying to obtain carboxy surface containing graphene powder, (v) adding aminated quinone polymer and carboxy surface containing graphene powder into water or ethanol, and ultrasonic dispersing to obtain a mixed dispersion, and (vi) refluxing the mixed dispersion under a nitrogen atmosphere at 100-120 degrees C for 48-72 hours, reacting, filtering, washing, and drying to obtain quinone polymer-graphene composite material; and (2) flexible lithium secondary battery, comprising a flexible battery shell, a flexible anode located within the flexible battery shell, a flexible cathode, a diaphragm and an electrolytic solution placed in the flexible battery shell, the diaphragm is set between the flexible anode and the flexible cathode, the flexible cathode comprises a cathode material, and the cathode material is quinone compound-graphene composite material.