| Structure and electrochemical properties of hypo-stoichiometric hydrogen storage alloys prepared by twin-roller rapid quenching process |
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| 引用本文： | ZHOU Liu LU Dongsheng LI Weishan HU Shejun CAI Yuepeng TANG Renheng XIAO Fangming. Structure and electrochemical properties of hypo-stoichiometric hydrogen storage alloys prepared by twin-roller rapid quenching process[J]. 稀有金属(英文版), 2005, 24(4): 336-340 |
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| 作者姓名： | ZHOU Liu LU Dongsheng LI Weishan HU Shejun CAI Yuepeng TANG Renheng XIAO Fangming |
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| 作者单位： | [1]Department of Chemistry, South China Normal University, Guangzhou 510631, China [2]Guangzhou Institute of Nonferrous Metal Research, Guangzhou 5100013, China |
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| 基金项目： | This project was supported by the National Natural Science Foundation of China （No. 20373016）, the Key Project of International Science and Technology Cooperation of M0ST of China （No. 2005DFA60580）, the Key Project of Guangdong Province （No. 2005B50101003）, and the Excellent Young Teachers Program of M0E of China. |
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| 摘 要： | 1 Introduction AB5-type rare-earth-based hydrogen storage al- loys have widely been used as negative electrode materials for nickel-metal hydride batteries due to their inherent advantages, especially high hydrogen storage capacity, easy activation and lo…
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| 关 键 词： | 结构 电气化学性质 化学计量 储氢合金 双辊快速淬火处理 |
| 收稿时间： | 2004-09-27 |
Structure and electrochemical properties of hypo-stoichiometric hydrogen storage alloys prepared by twin-roller rapid quenching process |
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| ZHOU Liu,LU Dongsheng,LI Weishan,HU Shejun,CAI Yuepeng,TANG Renheng,XIAO Fangming. Structure and electrochemical properties of hypo-stoichiometric hydrogen storage alloys prepared by twin-roller rapid quenching process[J]. Rare Metals, 2005, 24(4): 336-340 |
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| Authors: | ZHOU Liu LU Dongsheng LI Weishan HU Shejun CAI Yuepeng TANG Renheng XIAO Fangming |
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| Abstract: | The stoichiometric alloy MlB5.0 and the hypo-stoichiometric alloy MlB4.85 were prepared by twin-roller rapid quenching process, and their structure and electrochemical properties were studied. The results of XRD show that both of the alloys have a typical single-phase hexagonal CaCus-type structure. The cell volume of the hylpo-stoichiometric alloy M1B4.85 is slightly larger than that of the stoichiometric alloy M1B5.0, although its lattice constant cla is smaller. Under 2 C discharging rate, i.e. 640 mA/g, the M1B4.85 has a discharge capacity of 320 mAh/g, which is higher than that of the M1Bs.o, 312 mAh/g. Nevertheless, the capacities of the M1B4.85 and the M1Bs.o decline 24.7% and 20.2% after 400 cycles, respectively. The relationship of electrochemical performances of the alloys with their structures is discussed. |
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| Keywords: | hydrogen storage alloys structure electrochemical properties XRD electrochemical methods stoichiometry twin-roller rapid quenching process |
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