期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 735, 期 -, 页码 98-103出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.10.268
关键词
Nickel-metal hydride battery; Hydrogen storage; Electrochemical properties; Cycling
资金
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [NSFC51621001]
- National Natural Science Foundation of China Projects [51431001, 51771075]
A Pr, Nd and Co-free A(2)B(7)-type alloy, La13.9Sm24.7Mg1.5Ni58Al1.7Zr0.14Ag0.07, was prepared for use as a nickel-metal hydride battery electrode. The structural characteristics and hydrogen-storage and electrochemical properties of La13.9Sm24.7Mg1.5Ni58Al1.7Zr0.14Ag0.07 were investigated in detail. The La13.9Sm24.7Mg1.5Ni58Al1.7Zr0.14Ag0.07 alloy consisted of two phases (La2Ni7 and LaNi5) and showed excellent hydrogen-storage and electrochemical performance. The Delta H and Delta S values of this alloy were 24.4 kJ/mol H-2 and 66.2 J/(mol.K), respectively. The high rate dischargeabilities were 97%, 86% and 78%, respectively, at discharge current densities of 330, 970 and 1600 mAh/g. The hydrogen desorption pressure of the La13.9Sm24.7Mg1.5Ni58Al1.7Zr0.14Ag0.07 alloy was 0.005 MPa at 233 K, which is favour for the low temperature discharging. The retention rate maintained a high value of 86.2% after 200 cycles at 1 C. (C) 2017 Elsevier B.V. All rights reserved.
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