纳米级氢氧化镍和钴对镍电极性能的影响  

Effects of cobalt and nanometer nickel hydroxide on the performance of nickel electrodes

作　　者：郑辅养[1] 余兴增[1] 蔡长寿[1] 

机构地区：[1]中国科学院福建物质结构研究所二部,福建厦门361012

出　　处：《功能材料》2003年第2期167-169,共3页Journal of Functional Materials

基　　金：福建省自然科学基金资助项目(E9910029)

摘　　要：通过充放电曲线和交流阻抗谱的测定探讨了纳米级氢氧化镍和氢氧化镍表面包复CoOOH以及镍箔上电镀钴层对氢氧化镍粉末压制的镍电极性能的影响。结果表明,纳米级氢氧化镍有较快的活化能力,CoOOH包Ni(OH)2则有较高的放电容量,而比例适当的纳米复合镍电极才有更好的电化学性能。氢氧化镍表面包复CoOOH可改善镍电极的充放电性能;镍箔上镀钴可大大降低电极过程的电荷转移电阻;钴含量大于3％后,虽然活化速度有所下降,但是大电流充放电时,镍电极活性物的利用率更高,放电容量更大。纳米级Ni(OH)2含量大于30％后,镍电极的活化速度不仅未能加快,反而略有减慢,而且容量也降低。The effects of Ni(OH)2 coated with CoOOH,cobalt coat on nickel and nanometer nickel hydroxid on the performance of nickel electrode were studied by comparing the charge/discharge curves and electrochemical impedance spectroscopies. The results showed that nanocomposite nickel electrode has excellent comprehensive performance than nanometer nickel electrode. The charge/ discharge performance of nickel electrode was improved by Ni(OH)2 coated with CoOOH. The electric charge transmission resistance was largely decreased by plating cobalt on nickel.

关 键 词：纳米复合镍电极 表面包复 镀钴层 性能 氢氧化镍 二次电池 

分 类 号：TM912.1[电气工程—电力电子与电力传动]