▎ 摘　　要

NOVELTY - Preparation of manganese dioxide comprises taking graphene oxide, adding to deionized water, and sonicating to prepare graphene oxide dispersion; adding manganese dioxide precursor and citric acid, mixing, and adjusting pH to 1-7 with aqueous ammonia; stir-heating to 50-90 degrees C for 3-12 hours, cooling to 18-25 degrees C, aging for 24 hours, and drying at 70-130 degrees C for 4-12 hours; and calcining at 300-700 degrees C for 3-7 hours, and treating with 2 mol/L concentrated sulfuric acid for 1-4 hours. USE - Method for preparing manganese dioxide used for lithium ion battery cathode material (claimed). ADVANTAGE - The method is simple and has low energy consumption. The prepared manganese dioxide is E-type manganese dioxide with distinctive structural features and nanoparticle shape having average size of 20 nm and has high specific surface area and excellent electrochemical performance. The cathode material has high electrochemical performance.