▎ 摘　　要

NOVELTY - Method for preparing cobalt manganate/graphene composite material by adding graphene to mixed solution of alcohol and deionized water, carrying out dispersion treatment to obtain uniform graphene suspension, dissolving the cobalt salt and manganese salt in the suspension, stirring the mixed solution, transferring the mixed solution to an autoclave and placing in an oven for continuous reaction, centrifuging the mixed solution to obtain precipitate, washing the solid precipitate several times with deionized water, vacuum drying the obtained sample, placing the dried sample in a crucible and calcining in a tube furnace in an air atmosphere by heating, naturally cooling to normal temperature and grinding into a uniform powder, and mixing the powdered active material with acetylene black and polyvinylidene fluoride, dripping required amount of N-methylpyrrolidone, ball milling, coating the mixed slurry on a stainless steel foil and drying in vacuum. USE - The method is useful in aqueous-based zinc ion battery cathode material. ADVANTAGE - The method is simple and economical, has relatively large specific surface area, interlayer gap, and higher reversible specific capacity, provides many active sites for zinc ions to participate in the reaction, is conducive to the progress of the reaction, and has excellent cycle stability and rate performance. DETAILED DESCRIPTION - Method for preparing the cobalt manganate/graphene composite material involves (i) adding required amount of graphene to mixed solution of alcohol and deionized water in a volume ratio of 60:1-5, carrying out dispersion treatment under the ultrasonic condition for 2-6 hours to obtain uniform graphene suspension, dissolving the cobalt salt and manganese salt in the suspension at a molar ratio of 1:2-2.5, vigorously stirring the mixed solution at 20-50 degrees C for 30-60 minutes, transferring the mixed solution to an autoclave and placing in an oven at 150-200 degrees C for continuous reaction for 12-24 hours, centrifuging the mixed solution to obtain a precipitate, washing the solid precipitate several times with deionized water, vacuum drying the obtained sample at 60-70 degrees C for 12-16 hours, (ii) placing the dried sample in a crucible and calcining in a tube furnace in an air atmosphere by heating at 450-550 degrees C at a heating rate of 2-5 degrees C/minute and maintaining for 4 hours, naturally cooling to normal temperature and grinding into a uniform powder, and (iii) mixing the powdered active material with acetylene black and polyvinylidene fluoride in a mass ratio of 7-8:1-2:1, dripping required amount of N-methylpyrrolidone, ball milling for 4 hours, coating the mixed slurry on a stainless steel foil and drying in vacuum at 100-120 degrees C for 10-12 hours.