▎ 摘　　要

NOVELTY - Preparing self-assembled potassium manganese reduction-oxidation-graphene two-dimensional composite material comprises (a) adding sodium lauryl sulfate solution and sulfuric acid solution into deionized water, heating to 95℃ for 15 minutes, adding KMnO solution, stirring at constant temperature, cooling the product to room temperature and centrifuging at 5000 revolutions/minute, washing the product with ethanol, vacuum freeze-drying to obtain KMn8O16, (b) dispersing the KMn8O16 in deionized water to form KMn8O16 liquid and carrying out ultrasonic peeling, centrifuging the solution, removing the substrate and vacuum freeze-drying the solution to obtain exfoliated MnO2 nanosheets, namely e-KMn8O16, and (c) self-assembling by surface charge modification of eKMn8O16. USE - Method for preparing self-assembled potassium manganese oxide-red-oxidation-graphene two-dimensional composite material used in electrochemical energy storage field. ADVANTAGE - The method is simple and easy to control. The composite material structure is stable, the internal resistance is small, the specific surface area is large, it is good for fully electrolyte solution contact and the electrode material, ensuring the excellent electrochemical performance.