中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 26 No. 12 December 2016 |
（1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;
3. Whole Win (Beijing) Materials Sci. & Tech. Co., Ltd., Beijing 100083, China）
Abstract:La was partially substituted by Ce with the aim of improving the electrochemical hydrogen storage performances of La1–xCexMgNi3.5Mn0.5 (x=0, 0.1, 0.2, 0.3, 0.4) alloys, and melt spinning technology was adopted to fabricate the alloys. The identification of XRD and SEM reveals that the experimental alloys consist of a major phase LaMgNi4 and a secondary phase LaNi5. The growth of spinning rate results in that the lattice constants and cell volume increase and the grains are markedly refined. The electrochemical measurement shows that the as-cast and spun alloys can obtain the maximum discharge capacities just at the first cycle without any activation needed. With the increase of spinning rate, the discharge capacities of the alloys first increase and then decline, whereas their cycle stabilities always grow. Moreover, the electrochemical kinetic performances of the alloys first increase and then decrease with spinning rate growing.
Key words: Ni-MH battery; hydrogen storage; melt spinning; discharge capacity; kinetics
