化学镀镍对低钴贮氢合金放电性能的影响  

Effects of electroless Ni on the discharge performance of low-Co hydrogen storage alloys

作　　者：李守英[1] 李全安[1] 李克杰[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《电池》2006年第2期132-134,共3页Battery Bimonthly

基　　金：河南省杰出青年科学基金(0312000200);河南省高校创新人才培养基金(豫高教[2002]0129)

摘　　要：研究了化学镀镍对两种低钴贮氢合金粉末颗粒形态和放电性能的影响。结果表明:化学镀镍能提高低钴贮氢合金的循环稳定性、放电电位以及合金的高倍率放电性能,活化性能也有所改善。化学镀镍后,1C倍率放电容量达到0.4C放电容量的98.42%,表明化学镀镍是提高低钴贮氢合金高倍率放电的重要途径。化学镀镍后,一种合金的放电容量提高了27.0 mAh/g,另一种合金的放电容量降低6.5 mAh/g。SEM分析表明:合金在化学镀镍过程中发生吸氢反应,导致某些合金粉末开裂与粉化,以及有效合金量减少。有效合金量的减少是合金粉末放电容量降低的一个重要原因。The effects of electroless Ni on the particles morphology and the discharge performance of two low-Co hydrogen storage alloys powder were studied. The results showed that electroless Ni could increase the cycle stability, discharge voltage and improve the high rate discharge and the activation performance. 1 C rate discharge capacity could reach 98.42% of that of 0.4 C rate, which indicated electroless Ni was an effective way to improve high rate discharge performance of low-Co hydrogen storage alloy. After electroless Ni, the discharge capacity of one alloy improved 27.0 mAh/g, but the other decreased 6.5 mAh/g. The SEM morphology showed that hydrogen absorption reaction happened during the process of dectroless Ni. It could lead some alloy to cracks extension, pulverization and the effective alloys content decreasing. The effective alloys content decreasing was the reason to explain the discharge capacity of alloys powder reducing after electroless Ni.

关 键 词：MH/NI电池 低钴贮氢合金 化学镀镍 

分 类 号：TM910.4[电气工程—电力电子与电力传动]