掺锰镍电极电化学性能  

Electrochemical Performance of sub-Mn Nickel Electrode

作　　者：韩恩山[1] 康红欣[1] 董琪[2] 魏子海[1] 袁忠强[1] 

机构地区：[1]河北工业大学,天津300130 [2]河北工业大学廊坊分院

出　　处：《应用化学》2007年第9期1054-1057,共4页Chinese Journal of Applied Chemistry

摘　　要：采用共沉淀法在一定温度、pH值和搅拌速度下合成了掺锰氢氧化镍活性材料。对合成产品进行了X射线衍射分析和电化学性能分析。XRD分析表明,掺锰氢氧化镍形成了α和β混合相的晶体结构。通过对其进行充放电测试,结果表明,氢氧化镍活性材料中添加适量的锰有利于提高镍电极的电化学性能。研究结果表明,当锰摩尔分数为10%时,镍电极的充电平台最低,析氧平台提高;放电平台较高,在1.2V以上,放电态电阻较小,放电比容量达到243.21mA·h/g;由于添加锰元素可能形成了部分α-Ni(OH)2,使摩尔镍电子转移数较大,接近1。对添加锰的镍电极进行多次循环测试表明其循环性能较好,容量稳定。The coprecipitation method was used to prepare the active material of nickel hydroxide with Mn doped at a certain temperature, pH and stirring rate. XRD and electrochemical methods were applied to analyze the product. The XRD shows that α and β phases co-exist on mixing Mn with nickel ion to prepare the active material. The capability of nickel electrode is greatly improved by doping a certain amount of Mn, and when the molar amount of Mn is 10%, the oxygen evolution potential is increased, the charge potential of nickel electrode is decreased, the discharge potential of nickel electrode is increased, and the specific capacity is 243.21 mA · h/g. Because α nickel hydroxide is partially formed during the process of mixing Mn, the transition amount of electrons per mol nickel hydroxide is increased（ approaching to 1 ）. The cycle charge and discharge test results show that doping Mn into the nickel electrode could improve the cycle performance and level off the capacity at the same time.

关 键 词：镍电极 氢氧化镍 电化学性能 比容量 

分 类 号：O611.6[理学—无机化学]