溶胶-凝胶法制备超级电容器用二氧化锰

Preparing manganese dioxide for supercapacitor by sol-gel method

用溶胶-凝胶法制备超级电容器用二氧化锰（MnO2）电极材料，研究pH值、干凝胶焙烧温度对产物的影响。制备的MnO2为直锰矿型，晶体呈纤维丝状，颗粒结构松散、内部孔道较大，有利于电子传输和离子扩散。在pH值为8．0、干凝胶焙烧温度为350℃时制得的MnO2性能最好。以0．5mol／LNa2SO4为电解液，制得的MnO2组装电容器，以66．5mA／g的电流在0～0．8V进行恒流充放电，比电容达169．05F／g。

Manganese dioxide（ MnO2） electrode material for supercapaeitor was prepared by sol-gel method, the effects of pH value and xerogel calcination temperature to the product were studied. The prepared MnO2 was Ramsdellite, the crystal was fiber fila- mentous, the structure of particle was loose, the internal hole-channel was big and benefit to electron transfer and ion diffusion. The prepared MnO2 with the pH value of 8.0 and the xerogel calcination temperature of 350℃ had the best performance. When gal- vanostatie charged-discharged in 0 - 0.8 V, 66.5 mA/g, the specific capacitance of capacitor assembled with prepared M nO2 and 0.5 mol/L Na2S04 as electrolyte was 169.05 F/g.