通过KMnO4和MnCl2的低温固相反应,制备了掺杂稀土氧化镧的二氧化锰超大容量电容器复合正极材料.X射线衍射(XRD)分析表明,所制备复合电极材料中的MnO2是其α与γ相的混合晶相.透射电镜分析(TEM)表明,复合材料呈棒状结构,其平均长度为250～350nm,平均直径为15～20 nm,长径比大于15.通过对新型复合电极材料进行电化学性能测试表明,掺入氧化镧的复合电极材料具有更好的充放电性能和电容特性,当MnO2与La2O3的质量比为1:0.1时,复合电极在2 mol·L-1(NH4)2SO4溶液中单电极最大放电比容量可达156.15 F·g-1,比纯二氧化锰电极提高了54 6%,充放电效率提高了19.5%.
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