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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-xMnxCo0 .75Al0 .3 相结构和高温 (6 0℃ )电化学性能的影响。结果表明 ,RENi3.95-xMnxCo0 .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
Aiming at the high operating temperature of large-power Ni / MH battery for electric vehicle, the effects of Mn partial substitution of Ni on electrochemical properties of RENi3 .95-xMnxCo0 .75Al0.3 phase structure and high temperature (60 ℃) Impact. The results show that the RENi3.95-xMnxCo0.75Al0.3 (x = 0-0.6) alloy has a single CaCu5-type LaNi5 phase structure, and the unit cell volume increases with the increase of Mn content. The addition of Mn can effectively Improve the high temperature activation performance and discharge capacity of the alloy, but will accelerate the decline of the cycle capacity of the alloy and reduce the stability of the charge-discharge cycle; when the Mn content is between x = 0 and 0.3 ~ 0.5, the alloy has good high temperature and high rate discharge performance