氧化亚锰电极材料的制备及其超电容性能

Preparation and Supercapacitive Performance of Manganous Oxide Electrode Material

以乙酸锰和草酸为原料制备了草酸锰前驱体,并在氩气保护下将其焙烧得到了具有超电容特性的氧化亚锰,并对草酸锰前驱体的TG-DSC曲线和XRD谱以及氧化亚锰的SEM形貌、EDS结果和电化学性能进行了分析。结果表明:在氩气气氛中焙烧草酸锰前驱体能够生成面心立方结构的氧化亚锰;500℃焙烧可得到粒径为0.5～2.0μm的小颗粒状氧化亚锰,其电容特性分布在0～-0.8V电位范围内,在1mol·L-1 Li2SO4溶液中、0.1A·g-1电流密度下其比容量约为49.7F·g-1,经200次循环充放电后比容量衰减率仅为1.1%,适合用作超级电容器的负极材料。

Taking manganese acetate and oxalate as raw materials to prepare manganese oxalate precursor, and the precursor was roasted at argon atmosphere to obtain manganous oxide with supercapacitive characteristics. The TG-DSC curves and XRD patterns of manganese oxalate precursor, and the SEM morphology, EDS results and electrochemical performance were analyzed. The results show that manganous oxide with face-centered cubic structure was obtained by roasting manganese oxalate precursor at argon atmosphere. The small granular manganous oxide with diameter 0. 5- 2. 0 μm was got after roasting at 500 ℃, its capacitive characteristics distrihuted in the range of 0--0.8 V. The specific capacity was about 49.7 F·g^-1 under the condition of 1 mol ·L^-1 Li2SO4 solution and 0. 1 A ·g^-1 current density, and the lost rate of specific capacitance was only 1.1% after 200 charge-discharge cycles, so it could be used as anode material of supercapacitor.