用过二硫酸铵((NH4)2S2O8)氧化Mn(Ⅱ)盐制备-δMnO2。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-δMnO2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-δMnO2具有良好的层状结构,热稳定性能较好,放电容量较高(约160mA.h/g,2.0~4.5V)。δ-Manganese dioxide(δ-MnO_2) was prepared from a Mn(Ⅱ) salt oxidized by ammonium persulfate ((NH_4)_(2)S_2O_8). The crystalline form of the δ-MnO_2 was affected by the molar ratio of Mn~(2+) to OH~(-), (reaction) (temperature), and the amount of (NH_4)_2S_2O_8. The structure of the δ-MnO_2 was characterized by means of X-ray (diffraction)(XRD) and Infrared spectroscopy(IR). Its electrochemical performance was also (studied) via cyclic voltammetry and constant current charge/discharge experiments. The results indicate that (as-prepared) δ-MnO_2 has a good layer-structure and a high discharge capacity(~160 mA·h/g, 2.0~(4.5 V)).福建省教育厅资助项目(JB02193
