期刊
JOURNAL OF RARE EARTHS
卷 30, 期 12, 页码 1249-1254出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(12)60215-4
关键词
hydrogen storage alloy; non-stoichiometry; phase structure; electrochemical property; Ni/MH batteries; rare earths
资金
- National Natural Science Foundation of China [51001043]
- Program for New Century Excellent Talents in University [NCET2011]
- 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]
Phase structure and electrochemical characteristics of Co-free La0.7Ce0.3(Ni3.65Cu0.75Mn0.35Al0.15(Fe0.43B0.57)(0.10))(x) (0.90 <= x <= 1.10) alloys were investigated. When x was 0.90, the alloy was composed of LaNi5, La3Ni13B2 and Ce2Ni7 phases. The Ce2Ni7 phase disappeared, and the abundant of La3Ni13B2 phase decreased when x increased to 0.95. When x was 1.00 or higher the alloys consisted of LaNi5 phase. The lattice parameter a and the cell volume V of the LaNi5 phase decreased, and the c/a ratio of the LaNi5 phase increased with x value increasing. Maximum discharge capacity of the alloy electrodes first increased and then decreased with x value increasing from 0.90 to 1.10, and the highest value was obtained when x was 1.00. High-rate dischargeability at the discharge current density of 1200 mA/g increased from 50.7% (x= 0.90) to 64.1% (x=1.10). Both the charge-transfer reaction at the electrode/electrolyte interface and the hydrogen diffusion in the alloy were responsible for the high-rate dischargeability. Cycling capacity retention rate at 100th cycle (S-100) gradually increased from 77.3% (x= 0.90) to 84.6% (x= 1.10), which resulted from the increase in Ni content and the c/a ratio of the LaNi5 phas e with x value increasing.
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