熔盐法制备二氧化锰及其电化学性能  

Molten Salt Synthesis and Electrochemical Properties of Manganese Dioxide

作　　者：陈野[1] 张巍[1] 张尊波 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001 [2]哈尔滨巨容新能源有限公司,黑龙江哈尔滨150078

出　　处：《精细化工》2009年第2期115-118,共4页Fine Chemicals

基　　金：教育部博士点基金资助项目(20050217019)~~

摘　　要：以高锰酸钾和醋酸锰为原料，用熔盐法在KCl一LiCI体系中合成了二氧化锰（MnO2）电极材料。用x射线衍射（XRD）对其结构进行了考察，结果表明，合成样品含α-MnO2和γ-MnO2的混合晶相。用扫描电子显微镜（SEM）对样品形貌进行了表征，照片显示样品为棒状纤维。在C[（NH4）2SO4]=2mol／L电解液中采用三电极体系对样品进行循环伏安、交流阻抗和恒流充放电测试，结果显示该材料在0—1V（SCE）的电位窗口内具有良好的矩形特征和动力学可逆性；其等效串联电阻（R。）和电极反应电阻（R，）分别为0．67Q和0．72n；在电流密度为2mA／cm2时，单电极放电比容量达到246．20F／g，表现出优异的超级电容特性。MnO2 was prepared with KMnO4 and Mn（ CH3COO）2 by molten salt method in a system of KC1-LiCI then characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Results of XRD show that the crystal structures of the obtained sample consist of ot-MnO2 and T-MnO2. SEM images demonstrate that the sample has rod-~like apparent structure. Cyclic vohammetry, AC impedance and constant current charge/discharge were carried out on the sample in three-electrode system. The results of electrochemical tests show that the sample exhibits good rectangle feature in 2 mol/L （ NH4 ）2SO4 and kinetic reversibility in potential range of 0 - 1 V（SCE）. Moreover,the values of Rs and Rr are 0. 67 Ω and 0. 72 Ω respectively. The specific discharge capacitance of the sample is 246.20 F/g at the current of 2 mA/cm2. The results indicate that the products have excellent supercapacitor properties.

关 键 词：超级电容器 MnO: 熔盐法 电容性能 功能材料 

分 类 号：TM911[电气工程—电力电子与电力传动]