热处理对超级电容器MnO_2电极电化学性能的影响  

Effect of heat treatment on electrochemical properties of manganese dioxide for supercapacitor

作　　者：叶志国[1] 黄广斌[1] 刘华英[1] 董应虎[1] 周贤良[1] 华小珍[1] 袁学滔[2] 

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063 [2]北京有色金属研究总院,北京100088

出　　处：《材料热处理学报》2012年第9期13-16,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(21103085);航空基金(2009ZF56017);江西省自然科学基金(2010GQH0114)

摘　　要：采用阳极电沉积法制备MnO2粉末,并在不同温度(200～450℃)下对MnO2热处理,通过XRD分析热处理温度对MnO2粉末物相结构的影响,采用循环伏安法、恒流充放电法测试热处理温度对MnO2电极电化学性能的影响。结果表明:随着温度的升高,MnO2由原始的γ-MnO2逐渐变为β-MnO2,MnO2电极的比容量先增加后减小;当温度为300℃时,MnO2电极的比容量达到最高,在0.5 mol/L Na2SO4溶液中循环伏安扫描速度为10 mV.s-1条件下,电极比容量为156 F.g-1,且此时电极的稳定性良好,在10000个循环充放电内MnO2电极比容量几乎无衰减。Manganese dioxide powder were prepared by anodic deposition and heat treatment at 200-450 ℃.The phases of the powders were characterized by X-ray diffraction(XRD) and the electrochemical properties of the powder electrodes were clarified by cyclic voltammetry,galvanostatic charge/discharge.The results show that the original γ-MnO2 is converted to β-MnO2 progressively at higher temperatures.With the increasing of temperatures the specific capacitance is raised to a maximum value and then decreases.The highest specific capacitance(156 F·g-1) is obtained when treated at 300 ℃ with a CV scan rate of 10 mV·s-1 in 0.5 mol/L Na2SO4 solution,and it exhibits a high electrochemical stability(no deterioration) after 10000 charge/discharge cycles.

关 键 词：超级电容器 二氧化锰电极 热处理温度 电化学性能 

分 类 号：TG132.2[一般工业技术—材料科学与工程]