Preparation method of aqueous zinc ion battery composite positive electrode material

A preparation method of an aqueous zinc ion battery composite positive electrode material comprises the following steps: adding a LiOH.H2O aqueous solution into a V2O5 aqueous solution, keeping the temperature at 85-95 DEG C, and adding diamine sulfate into the solution to obtain a reaction solution; the preparation method comprises the following steps: stirring a reaction solution for 5-10 minutes, adding ultrapure water for dilution, adding KMnO4 into the reaction solution, continuously heating for 1-2 hours, filtering, standing filtrate for 10-14 hours, washing black columnar crystals separated out from the filtrate with water, air-drying to obtain [H6Mn3V19O46 (H2O) 12]. 30H2O, mixing the [H6Mn3V19O46 (H2O) 12]. 30H2O with graphene, and calcining at high temperature to obtain the V2O3/MnO2/graphene composite positive electrode material. The preparation process is simple, the reaction condition is mild, the cost is low, and the equipment requirement is low; the obtained composite positive electrode materia