研究了熔体旋淬和常规熔铸Ml(NiCoMnAl)5 贮氢合金的微结构和电化学行为。 S EM 和XRD分析表明， 熔体旋淬合金由细小的柱状晶组成， 它们的晶体结构与铸态一样， 都为 CaCu5 型六方晶体结构。 电化学测试表明， 旋淬态合金电极初始容量较高(>210 mA*h/g )， 经1～2 次循环就可达到最大放电容量。 旋淬速度为10 m/s的合金电极的放电容量(294 mA*h/g)稍高于铸 态合金电极的容量， 所有旋淬态合金电极充放电循环稳定性皆优于铸态合金。 在600 mA/g电流质量密度 下， 旋淬速度为10 m/s的合金电极具有较好的高倍率充放电能力， 但随着 循环次数的增加， 其容量稳定性稍次于旋淬速度为25 m/s和40 m/s的合金 电极。
The microstructure and electrochemical behavior s of Ml(NiCoMnAl)5 allo ys prepared by both the melt-spinning method and the conventional induction mel t ing were investigated. SEM and XRD analysis show that melt-spinning alloys are of columnar microstructure which belong to the CaCu5 type hexagonal crystal st ruct ure as same as as-cast alloy. The electrochemical measurements show that the in i tial capacities of melt-spinning alloy electrodes are all above 210 mA* h/g， reachi ng their maximum capacities after the second charge-discharge cycles. The maxim u m capacity (294mA*h/g) of melt spinning (10m/s) alloy electrodes is the sam e as t hat of as-cast alloy electrode， the stability of charge-discharge cycles of all melt-spinning alloy electrodes is better than that of the as-cast alloy electr od es. When charged at 600mA/g， the melt spinning (10m/s) alloy electrode has bette r high rate discharge capability; but with the cycle number increasing， the cy cl e stability is less than those electrodes of melt spinning rate of 25m/s and 4 0m/s.
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