贮氢合金高倍率放电性能的研究  

Study on the high-rate discharge performance of hydrogen storage alloy

作　　者：郭靖洪[1] 陈德敏[1] 杨柯[1] 刘多然 于军 段秋生 刘国忠 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110015 [2]三普电池公司,辽宁沈阳110015

出　　处：《电源技术》2002年第B07期191-194,共4页Chinese Journal of Power Sources

摘　　要：研究了贮氢合金表面处理、粒度分布、稀土组成、Al含量和添加剂硼对贮氢合金高倍率放电性能的影响。采用物理方法和化学方法对贮氢合金进行表面处理 ,提高了合金表面电化学反应速度 ,同时促进了氢原子在合金本体中的扩散 ,从而改善了合金的活化性能、放电容量和高倍率放电能力。贮氢合金粉粒度太粗和太细都使合金电极阻抗增大 ,导致放电容量和高倍率放电能力下降 ,而且大电流放电平台也较低。选择合适的贮氢合金粉粒度分布既可提高合金的活性和放电容量 ,又能改善合金高倍率放电能力。随着合金中La含量的增加和Al含量的减少 ,提高了合金的表面活性 ,使合金的大电流放电性能得到改善。贮氢合金中加入少量元素B ,形成第二相 。Effects of surface treatment, particle size distribution, rare earth composition, Al content and B additive of hydrogen storage alloy on its high rate discharge performance was investigated. The electrochemical reaction rate at alloy surface and the diffusion of hydrogen atom in the alloy bulk are improved due to the surface treatment by physical and chemical processes, so the activity, discharge capacity and high rate dischargeability are modified. The alloy powder with either large or small particle size increases the contact resistance of electrode, which decrease its discharge capacity, high rate dischargeability and large current discharge plateau. Therefore, the proper particle distribution of hydrogen storage alloy is favorable to improve either the activity or the high rate dischargeability. The surface activity and the large current dischargeability of alloy are modified with the increasing of La content and the decreasing of Al content in alloy. Adding small amount of B in alloy to form the second phase will also improve its activity and discharge capacity, especially the high rate dischargeability.

关 键 词：贮氢合金 高倍率放电性能 放电容量 活性 MH-NI蓄电池 

分 类 号：TM912.2[电气工程—电力电子与电力传动] TM241[一般工业技术—材料科学与工程]