| Influence of material processing on crystallographic and electrochemical properties of cobalt-free LaNi4.95Sn0.3 hydrogen storage alloy |
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| 引用本文： | 魏范松 雷永泉 陈立新 应窕 葛红卫 吕光烈. Influence of material processing on crystallographic and electrochemical properties of cobalt-free LaNi4.95Sn0.3 hydrogen storage alloy[J]. 中国有色金属学会会刊, 2006, 16(3): 527-531. DOI: 10.1016/S1003-6326(06)60092-7 |
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| 作者姓名： | 魏范松 雷永泉 陈立新 应窕 葛红卫 吕光烈 |
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| 作者单位： | Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China，Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China，Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China，Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China，Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China，Central Laboratory Zhejiang Un iversity Hangzhou 310028 China |
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| 摘 要： | 1 Introduction Mischmetal-based AB5-type alloys containing about 10% Co (mass fraction) are now widely used as the negative electrode materials of Ni/MH batteries because of their long cycle life and good overall properties. It is known that Co is an ess…
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| 关 键 词： | 贮氢合金 钴基合金 材料处理 晶体结构 电化学性能 结晶 稀土 |
| 收稿时间： | 2005-08-22 |
| 修稿时间： | 2005-11-15 |
Influence of material processing on crystallographic and electrochemical properties of cobalt-free LaNi4.95Sn0.3 hydrogen storage alloy |
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| WEI Fan-song,LEI Yong-quan,CHEN Li-xin,YING Tiao,GE Hong-wei,L Guang-lie. Influence of material processing on crystallographic and electrochemical properties of cobalt-free LaNi4.95Sn0.3 hydrogen storage alloy[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(3): 527-531. DOI: 10.1016/S1003-6326(06)60092-7 |
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| Authors: | WEI Fan-song LEI Yong-quan CHEN Li-xin YING Tiao GE Hong-wei L Guang-lie |
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| Affiliation: | WEI Fan-song,LEI Yong-quan,CHEN Li-xin,YING Tiao,GE Hong-wei,L(U) Guang-lie |
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| Abstract: | The effects of the alloy preparation methods, including the conventional casting, annealing and melt-spinning, on the crystallographic and electrochemical properties of the Co-free LaNi4,95Sn0.3 alloy samples were investigated. The results reveal that the as-cast alloy consists of a main phase of CaCu5-type structure and a little second phase (Sn) with noticeable composition segregation and rather poor cycling stability (S200=40.1%). While the annealed and melt-spun alloys are of single CaCu5-type structure phase with a more homogeneous composition and lower cell volume expansion rate (ΔV/V) on hydriding, and a dramatically improved cyclic stability (S200=73.6%–76.2%), although their activation rate, initial capacity and high-rate dischargeability are lowered somewhat. It is found that the decrease in both the electrocatalytic activity and the hydrogen diffusion rate of the annealed and melt-spun alloys is the main cause for their relatively lower high-rate dischargeability, and the improved cycling stability is due to their lower volume expansion on hydriding and more uniform composition. |
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| Keywords: | hydrogen storage alloy Co-free alloy material processing crystal structure electrochemical property |
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