| Effects of rapid quenching on microstructures and electrochemical properties of La0.7Mg0.3Ni2.55Co0.45Bx（x=O-0.2） hydrogen storage alloy |
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| 引用本文： | 张羊换,董小平,王周清,郭世海,任江远,王新林.Effects of rapid quenching on microstructures and electrochemical properties of La0.7Mg0.3Ni2.55Co0.45Bx（x=O-0.2） hydrogen storage alloy[J].中国有色金属学会会刊,2006,16(4):800-807. |
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| 作者姓名： | 张羊换 董小平 王周清 郭世海 任江远 王新林 |
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| 作者单位： | [1]School of Material, Inner Mongolia University of Science and Technology, Baotou 014010, China [2]Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China |
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| 基金项目： | Project（50131040） supported by the National Natural Science Foundation of China; Project（20050205） supported by the Key Technology Research and Development Program of Inner Mongolia Province, China; Project（NJ05064） supported by the Higher Education Science Research Project of Inner Mongolia Province, China |
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| 摘 要： | In order to improve the electrochemical performances of La-Mg-Ni based electrode alloys with PuNi3-type structure, a trace of boron was added in La0.7Mg0.3Ni2.55Co0.45 alloy. The La0.7Mg0.3Ni2.55Co0.45Bx（a=0, 0.05, 0.1, 0.15 and 0.2） alloys were prepared by casting and rapid quenching. The electrochemical performances and microstructures of the as-cast and quenched alloys were investigated. The effects of rapid quenching on the microstructures and electrochemical performances of the above alloys were investigated. The results show that the as-cast and quenched alloys are composed of （La, Mg）Ni3 phase, LaNi5 phase and LaNi2 phase. A trace of the Ni2B phase exists in the as-cast alloys containing boron, and the Ni2B phase in the B-contained alloys nearly disappears after rapid quenching. Rapid quenching increases the amount of the LaNi2 phase in the B-free alloy, but it decreases the amount of the LaNi2 phase in the boron-containing alloys. The effects of rapid quenching on the capacities of the boron-containing and boron-free alloys are different. The capacity of the B-free alloy monotonously decreases with increasing quenching rate, whereas the capacities of the B-contained alloys have a maximum value with the change of the quenching rate. The rapid quenching can improve the stability of La-Mg-Ni based electrode alloy but lowers the discharge plateau voltage and decreases the plateau length. The effect of rapid quenching on the activation capabilities of the alloys was complicated.
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| 关 键 词： | La-Mg-Ni 稀土 电极合金 淬火 显微结构 电化学性能 贮氢合金 |
| 收稿时间： | 2005-08-29 |
| 修稿时间： | 2006-04-01 |
Effects of rapid quenching on microstructures and electrochemical properties of La0.7Mg0.3Ni2.55Co0.45Bx(x=0?0.2) hydrogen storage alloy |
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| ZHANG Yang-huan, DONG Xiao-ping, WANG Guo-qing, GUO Shi-hai, REN Jiang-yuan, WANG Xin-lin.Effects of rapid quenching on microstructures and electrochemical properties of La0.7Mg0.3Ni2.55Co0.45Bx(x=0?0.2) hydrogen storage alloy[J].Transactions of Nonferrous Metals Society of China,2006,16(4):800-807. |
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| Authors: | ZHANG Yang-huan DONG Xiao-ping WANG Guo-qing GUO Shi-hai REN Jiang-yuan WANG Xin-lin |
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| Affiliation: | 1. School of Material, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;1. College of Chemical Engineering, Guizhou University of Engineering Science, Bijie 551700, China;2. Guizhou Province New Coal-based Materials Engineering Center, Bijie 551700, China;1. School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, China;2. WA School of Mines: Minerals, Energy and Chemical Engineering (WASM MECE), Curtin University, Perth, Western Australia, 6102, Australia;1. College of Chemistry and Chemical Engineering, Xuchang University, Xuchang, 461000, PR China;2. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, PR China;2. Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 El Manar, Tunis, Tunisia |
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| Abstract: | In order to improve the electrochemical performances of La-Mg-Ni based electrode alloys with PuNi3-type structure, a trace of boron was added in La0.7Mg0.3Ni2.55Co0.45 alloy. The La0.7Mg0.3Ni2.55Co0.45(x=0, 0.05, 0.1, 0.15 and 0.2) alloys were prepared by casting and rapid quenching. The electrochemical performances and microstructures of the as-cast and quenched alloys were investigated. The effects of rapid quenching on the microstructures and electrochemical performances of the above alloys were investigated. The results show that the as-cast and quenched alloys are composed of (La, Mg)Ni3 phase, LaNi5 phase and LaNi2 phase. A trace of the Ni2B phase exists in the as-cast alloys containing boron, and the Ni2B phase in the B-contained alloys nearly disappears after rapid quenching. Rapid quenching increases the amount of the LaNi2 phase in the B-free alloy, but it decreases the amount of the LaNi2 phase in the boron-containing alloys. The effects of rapid quenching on the capacities of the boron-containing and boron-free alloys are different. The capacity of the B-free alloy monotonously decreases with increasing quenching rate, whereas the capacities of the B-contained alloys have a maximum value with the change of the quenching rate. The rapid quenching can improve the stability of La-Mg-Ni based electrode alloy but lowers the discharge plateau voltage and decreases the plateau length. The effect of rapid quenching on the activation capabilities of the alloys was complicated. |
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| Keywords: | La-Mg-Ni based electrode alloys rapid quenching microstructures electrochemical properties |
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