An analysis has been made of the basic physical and chemical properties of electrolytic manganese anode slime by adopting various analytical methods. After a high-temperature calcination process, a crystal regulation can be achieved of the crystalline form of MnO2 in electrolytic manganese anode slime and MnO2 battery cathode material can be prepared after activation. A research has been made on the effects of different calcination temperatures on the crystal features, morphology and discharge performance. The results show that the anode slime undergoes a change from mixed crystal to alpha -MnO2, with the microstructure of the anode improved after being calcined 2 h at 350 ℃. The capacity of constant-current-discharge ratio is up to 109.03 mA·h/g, which is 43% higher than that of electrolytic manganese anode slime, and 20% higher than the capacity of pure manganese dioxide.