Microstructure and electrochemical behaviors of melt-spinning alloy Ml(NiCoMnAl)5
Author(s): WEN Mingfen, ZUO Min, CHEN Lian, WU Feng, CHEN Demin, DAN Zhongqiang, MA Rongjun, DI Yuchun
Pages: 84-90
Year: 2001 Issue: 1
Journal: THE CHINESE JOURNAL OF NONFERROUS METALS
Keyword: 熔体旋淬; 贮氢合金电极; 电化学行为; 柱晶组织;
Abstract: 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.
Pages: 84-90
Year: 2001 Issue: 1
Journal: THE CHINESE JOURNAL OF NONFERROUS METALS
Keyword: 熔体旋淬; 贮氢合金电极; 电化学行为; 柱晶组织;
Abstract: 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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