Preparation of MnO2 by Different Methods and Its Application in Zinc-based Battery Cathode Materials
In this paper,MnO2 was prepared from potassium permanganate and manganese sulfate by hydrothermal method and coprecipitation method,respectively.The structure of MnO2 was characterized by infrared spectroscopy(FTIR),X-ray diffraction(XRD)and scanning electron microscopy(SEM).At the same time,a battery system with MnO2 as the positive electrode,1M zinc sulfate solution as the electrolyte and zinc sheet as the negative electrode was assembled,and the electrochemical properties of MnO2 prepared by different methods in the positive electrode material of the aqueous zinc-based battery were measured.The results show that MnO2 prepared by hydrothermal method has better electrochemical performance.At 100 mA charge-discharge current,the highest specific discharge capacity reaches 333.2 mAh/g,the specific charging capacity reaches 330.6 mAh/g,the first cycle efficiency is 96.1％,and after 100 cycles,the efficiency reaches 99.8％.
aqueous zinc ion batterycathode materialhydrothermal methodMnO2
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