| Microstructure and electrochemical characteristics of La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x（V0.81Fe0.19）x hydrogen storage alloys |
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| 引用本文： | 刘宝忠,胡琴娟,李安铭,吉力强,张宝庆,朱惜林.Microstructure and electrochemical characteristics of La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x（V0.81Fe0.19）x hydrogen storage alloys[J].中国稀土学报(英文版),2012,30(8):769-774. |
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| 作者姓名： | 刘宝忠 胡琴娟 李安铭 吉力强 张宝庆 朱惜林 |
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| 作者单位： | [1]School of Materials Science ＆ Engineering, Henan Polytechnic University, Jiaozuo 454000, China [2]Inner Mongolia Rare Earth Ovonic Metal Hydride Co. Ltd., Baotou 014030, China |
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| 基金项目： | Project supported by National Natural Science Foundation of China （51001043）, China Postdoctoral Science Special Foundation （201104390, 20100470990）, Program for Innovative Research Team （in Science and Technology） in the University of Henan Province （2012IRTSTHN007）, Baotou Science and Technology Project （2011 J1003） and the Doctoral Foundation of Henan Polytechnic University （B2010-13） |
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| 摘 要： | Microstructure and electrochemical characteristics of La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x(V0.81Fe0.19)x hydrogen storage alloys were investigated. XRD indicated that La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x(V0.81Fe0.19)x alloys consisted of a single phase with CaCu5-type structure, and the lattice parameter a and cell volume V increased with increasing x value. The maximum discharge capacity first increased from 319.0 (x=0) to 324.0 mAh/g (x=0.05), and then decreased to 307.0 mAh/g (x=0.20). The high-rate dischargeability at the discharge current density of 1200 mA/g first increased from 52.1% (x=0) to 59.1% (x=0.15), and then decreased to 55.4% (x=0.20). The hydrogen diffusion in the bulky alloy was responsible for the high-rate dischargeability. Cycling stability first increased with increasing x from 0 to 0.10 and then decreased when x increased to 0.20, which was resulted from the synthesized effect of the improvement of the pulverization resistance and the decrease of corrosion resistance.
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| 关 键 词： | hydrogen storage alloy VFe alloy phase structure electrochemical property Ni/MH batteries rare earths |
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