锰掺杂α-Ni(OH)2的合成及其电化学性能

Preparation,characterization and electrochemical behavior of Mn-doping nickel hydroxides

以硫酸镍和硫酸锰为原料、聚乙二醇为结构导向剂,采用化学共沉淀的方法制备了纳米片状的锰掺杂氢氧化镍。用X射线衍射(XRD)、场发射扫描电镜(SEM)对样品的结构和形貌进行了表征;用傅里叶变换红外光谱(FT-IR)和热重分析(TG)手段对样品的成分进行了测定;用循环伏安、恒电流充放电等测试方法对其电化学性能进行研究。研究结果表明,采用该方法制备的样品,其电化学性能随锰含量的增加而变化;锰含量为30%时性能最佳,其比容量可达330mAh/g,有望成为Ni/MH电池的正极材料。

The sheet-like Mn-doping α-Ni（OH）2 was successfully prepared with a chemical coprecipitation method, in which nickel sulfate and manganese（Ⅱ） sulfate were used as the raw material and polyethylene glycol as the structure directing agent. The components of products were analyzed by FT-IR and thermogravimetry（TG）. The structure and morphology were characterized using X-ray diffraction （XRD） and field emission scanning electron microscopy （FESEM）, respectively. The electrochemical performances were investigated by cyclic voltammetry and constant current charge/discharge techniques. The results showed that the electrochemical performances of the resultant products depended significantly on the Mn-doping amounts. The specific capacity as high as 330 mAh/g was achieved at the Mn-doping amount of 30%, suggesting that the Mn-doping α-Ni（OH）2 was a promising positive material for Ni/MH cells.