的相结构与高温电化学性能
(浙江大学 材料科学与工程系， 杭州 310027)
摘 要: 针对电动车用大型动力Ni/MH电池工作温度较高的特点，系统地研究了Mn部分取代Ni对贮氢合金RENi3.95-xMnx Co0.75Al0.3相结构和高温（60 ℃）电化学性能的影响。结果表明，RENi3.95-xMnx Co0.75Al0.3(x=0～0.6)合金具有单一的CaCu5型LaNi5相结构，其晶胞体积随Mn含量的增加而增大；Mn的加入能有效地改善合金的高温活化性能和放电容量，但会加快合金的循环容量衰退，降低充放电循环稳定性；Mn含量在x=0.3～0.5时，合金具有较好的高温高倍率放电性能。
关键字: 贮氢电极合金； Mn含量； 相结构； 电化学性能
of RENi3.95-xMnx Co0.75Al0.3( x =0～0.6) hydrogen
storage alloys at higher
（Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, P.R.China）
Abstract:In view of higher working temperature of large-size Ni/MH battery used as EV battery, the effects of various content of Mn on the phase structure and electrochemical properties of RENi3.95-xMnx Co0.75Al0.3(x=0～0.6) hydrogen storage alloys at higher temperature (60 ℃) have been investigated systematically. The results show that by the addition of Mn, the alloys still have single CaCu5 type LaNi5 phase structure, but the lattice volume increased; when Mn is added, the activation behavior and discharge capacity of the alloys are improved, whereas the cycling stability deteriorated; high-rate-dischargeability is better when x =0.3～0.5.
Key words: hydrogen storage alloy； Mn content； phase structure； electrochemical performance
