δ-MnO_2的制备与性能  

Preparation and Properties of δ-MnO_2

作　　者：张启卫[1] 钟建生 黄行康[2] 黄河宁[1] 杨勇[2] 

机构地区：[1]三明学院化学与生物工程系,三明365004 [2]厦门大学化学系

出　　处：《应用化学》2005年第8期908-911,共4页Chinese Journal of Applied Chemistry

基　　金：福建省教育厅资助项目(JB02193)

摘　　要：用过二硫酸铵((NH4)2S2O8)氧化Mn(Ⅱ)盐制备δ-MnO2. 比较了反应过程中Mn2+与OH-的摩尔比、反应温度、(NH4)2S2O8用量等因素对MnO2晶型的影响. 用X射线衍射(XRD)、红外光谱(IR)分析了制得的δ-MnO2的结构. 测试了样品的热性能和循环伏安、恒电流充放电性能. 结果表明所制备的δ-MnO2具有良好的层状结构,热稳定性能较好,放电容量较高(约160 mA·h/g,2.0～4.5 V).δ-Manganese dioxide（δ-MnO2） was prepared from a Mn （Ⅱ） salt oxidized by ammonium persulfate （（NH4）2S2O8）. The crystalline form of the δ-MnO2 was affected by the molar ratio of Mn^2＋ to OH^- ,reaction temperature, and the amount of （NH4）2S2O8. The structure of the δ-MnO2 was characterized by means of X-ray diffraction（XRD） and Infrared spectroscopy（IR）. Its electrochemical performance was alsostudied via cyclic voltammetry and constant current charge/discharge experiments. The results indicate that as-prepared δ-MnO2 has a good layer-structure and a high discharge capacity （-160 mA·h/g, 2.0-4.5V）.

关 键 词：Δ-MNO2 制备 性能 

分 类 号：O621[理学—有机化学]