覆钴Ni(OH)_2电极在充放电循环过程中的结构变化  

Structure change of nickel hydroxide electrode encapsulated by cobalt during charge-discharge cycles

作　　者：罗方承[1] 陈启元[1] 李新海[1] 

机构地区：[1]中南大学化学化工学院

出　　处：《电源技术》2007年第8期640-643,共4页Chinese Journal of Power Sources

基　　金：国家科技部"十五"科技攻关引导计划项目(2003BA433C)

摘　　要：β-Ni(OH)2在高倍率充电或过充电时容易转化为γ-NiOOH,引起电极膨胀、变形,从而影响电池的性能和寿命。在β-Ni(OH)2微粒表面化学覆钴后能改善电极的性能,通过X射线衍射(XRD)研究发现,化学覆钴后的β-Ni(OH)2电极在充放电循环过程中其γ-NiOOH的产生能得到明显抑制;扫描电子显微镜(SEM)测试发现充放电循环后β-Ni(OH)2微粒的粉化明显减少。β-Ni（OH）2 can easily be transferred into γ-NiOOH when charged at high rate or overcharged, which results in deformation and swelling of the electrode, and thus being detrimental to the battery performance. Electroless cobalt depositing on the surface of spherical nickel hydroxide particles was demonstrated to improve the characteristics of the nickel hydroxide electrode. In present study we found that the formation of γ-NiOOH could be markedly inhibited and pulverization of β-Ni（OH）2 could be apparently reduced during charge-discharge after electro-less cobalt was deposited by XRD and SEM analysis.

关 键 词：Β-NI(OH)2 Γ-NIOOH 金属氢化物镍蓄电池 粉化 

分 类 号：TM912.2[电气工程—电力电子与电力传动]