贮氢合金RENi_3.95-xMn_xCo_0.75Al_0.3（x =0～0 .6）的相结构与高温电化学性能

来源期刊：中国有色金属学报2001年第z1期

论文作者：郭蕊 陈立新 李世群 雷永泉

文章页码：121 - 124

关键词：贮氢电极合金； Mn含量； 相结构； 电化学性能

Key words：hydrogen storage alloy； Mn content； phase structure； electrochemical performance

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RENi_3.95-xMn_xCo_0.75Al_0.3相结构和高温 (60℃ )电化学性能的影响。结果表明 ,RENi_3.95-xMn_xCo_0.75Al_0.3(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。

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 RENi_3.95-xMn_xCo_0.75Al_0.3( 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 CaCu 5 type LaNi 5 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.