α-MnO_2的制备及其电化学性能

Synthesis of α-MnO_2 and its Electrochemical Performances

采用氧化还原法制备α -MnO2 ,所得的样品进行了XRD ,ICP ,SEM ,化学分析 ,Tafel曲线 ,恒流放电 ,循环伏安等一系列测试 ,并与国际一号样 (I .C .NO .1)相比较。得出α -MnO2 在碱性溶液中的开路电压虽然高 ,但是浅度放电容量不佳。直到深度放电下才与γ -MnO2 相当或稍大 ,尤其是轻负荷放电下要好。

MnO 2 was prepared by the method of redox.The optimum condition to form α-MnO 2 was discussed.The measurements such as XRD,SEM,ICP,chemical analysis,constant current discharge,cyclic voltammetry,Tafel curve test were performed and compared with those of I.C.No.1(International Common MnO 2 Sample No.1).In spite of the open circuit voltage of α-MnO 2 in alkaline solution was higher,the discharge capacity was not better in the shallow discharge stage.Their discharge capacity was near or higher than that of γ-MnO 2 in deep discharge stage especially under light load discharge conditions.