中文摘要：

用不同晶型的MnO2粉体制备了β-MnO2和γ-MnO2电极,用循环伏安和恒流充放电试验研究了上述两种电极的电化学特性。结果表明：β-MnO2和γ-MnO2电极都具有良好的电容性能,但后者具有更为良好的倍率放电性能,适合大电流充放电;在300mA.g-1的电流密度下,经5 000个循环充放电之后,β-MnO2电极已失效,而γ-MnO2电极的容量保持率还高达89.2%。

英文摘要：

The β-typed and γ-typed electrodes were prepared by MnO2 powders with different crystal forms,and the electrochemical properties of the above-mentioned electrodes were studied by cyclic voltammetry method and constant-current charge and discharge test.The results show that both the β-typed and γ-typed electrodes had good capacitance property,and the γ-MnO2 electrode had better rate discharge property and was more suitable for charge-discharge of larger current.Under the condition of the current density of 300 mA·g-1,the β-MnO2 electrode became invalid but the capacitance retention of γ-MnO2 electrode was still as high as 89.2% after circulatory charge-discharge 5 000 cycles.