Ml1—xCax（Ni,Co,Al）5贮氢合金的电化学性能

本文初步研究了M11－xCax（Ni，Co，Al）5合金中Ca含量对金属氢化物（MH）电极的电化学性能和合金的平台压力的影响．实验结累表明随苦合金中Ca含量的增加。活化性能得到改善．但是电极的充放电循环稳定性却下降，特别当X≥0．2时、电极的循环稳定性明显下降．在x＝0．1时．合金电极具有最大的电化学放电容量331mAh·g－1（C／3，在1C，2C倍率放电条件下、x=0．1和x＝0．2的合金电极具有较好的高倍率放电性能．在x＜0．3时，合金的平台压力随着x值的增加而上升，但x＝0．4的合金平台压力比2＝0．3的合金平台压力略有降低

ELECTROCHEMICAL PERFORMANCES OF M1_(1-x)Ca_x(Ni,Co,Al)_5 HYDROGEN STORAGE ALLOYS

The effects of the Ca content in M11-x Ca (Ni, Co,Al) 5 hydrogen storage alloys on the electrochendcal performances of hydride electrodes were investigated. It was found that when the Ca cobment in alloys increased, the electrodes actiVation poverty was approved but their cycling durability deCr~d. At x=0.1, alloy has the most discharge capaCity of 331 mAh.g--'(C/3). MIO.sCaO.,(Ni,Co,AI)s and Mfo.sCaO.:(Ni,Co,AI)s alloys have better high--rate dischargeability at iC and ZC rates. At x <0.3, the plateau pressures of the hydrogen storage alloys increases with increasing x. But the plateau pressure of Mad.6CaO.4(Ni,Co,AI)~ alloy is slight lower than that of Mad.:CaO.3(Ni,Co,AI)5 alloy.