电解MnO2机械球磨-掺杂改性及其在超级电容器中的应用

以电解二氧化锰（EMD）为原料,采用机械球磨-掺杂对其进行改性制备了二氧化锰超级电容器电极材料,并采用SEM和XRD手段对产物进行表征。结果表明,改性前后样品均为球形γ-二氧化锰,改性前电极比容量为140 F/g,通过机械球磨-掺杂Al2O3改性的EMD电极材料比未改性的有较好的循环伏安特性,且当添加质量分数为1%时,电极比容量达到最大,为165 F/g,经过200次循环后容量仍保持在90%以上。

Modification of MnO2 Electrode Materials for Super Capacitor

With EMD as raw material,MnO2 used for electrode materials of super capacitor was prepared by ball-milling and doped modification.The product is characterized by XRD and SEM.The results shows that the EMD after and before modification is spherical-MnO_2.The specific capacity of EMD before modification is 140 F/g and the cyclic voltage-ampere characteristic of the as-modified EMD electrode material is better than non-modified EMD.While doping amount is 1% （mass fraction of Al2O3）,the electrode material could attain the highest specific capacity of 165 F/g,and after 200 cycles of constant charge-discharge,the electrode is stable and has a capacitance still of more than 90%.