期刊
JOURNAL OF RARE EARTHS
卷 30, 期 8, 页码 769-774出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(12)60127-6
关键词
hydrogen storage alloy; VFe alloy; phase structure; electrochemical property; Ni/MH batteries; rare earths
资金
- 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 [2011J1003]
- Doctoral Foundation of Henan Polytechnic University [B2010-13]
Microstructure and electrochemical characteristics of La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x(V0.8 1Fe0.19)(x) hydrogen storage alloys were investigated. XRD indicated that La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x(V0.8 1Fe0.19)(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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