An improvement of self-discharge properties of Ce2Ni7-type La0.65Ce0.1Mg0.25Ni3Co0.5 hydrogen storage alloy produced by the melt-spun processing
An improvement of self-discharge properties of Ce2Ni7-type La0.65Ce0.1Mg0.25Ni3Co0.5 hydrogen storage alloy produced by the melt-spun processing
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熔纺加工Ce2Ni7型La0.65Ce0.1Mg0.25Ni3Co0.5储氢合金自放电性能的改善
DOI：
10.1016/j.jallcom.2021.160183
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发表时间：
2021-09
影响因子：
6.2
通讯作者：
Wu Ying
中科院分区：
文献类型：
--
作者：
Lv Wei;Zeng Hong;Chen Xiaohong;Xue Zhiyong;Wu Ying
研究了采用常规铸造、退火和快淬工艺制备的Ce 2Ni 7型La0.65Ce0.1Mg0.25Ni3Co0.5贮氢合金的显微组织和自放电性能。熔体快淬工艺通过改变微结构的演变，对改善自放电性能是非常有效的。X射线衍射（XRD）分析表明，3种样品的主相均为（La，Mg）2Ni 7，空间群为P63/mmc，但快淬合金的（La，Mg）2Ni 7相晶胞体积最小。3种合金在248 K下的电荷留存率（CRR）的提高比298 K下的明显，特别是快淬合金。放电平台的增加导致合金电极的可逆自放电增加，与腐蚀程度相对应。因此，快淬合金具有以可逆自放电过程为主的最佳自放电性能。
The microstructure and self-discharge properties of Ce2Ni7-type La0.65Ce0.1Mg0.25Ni3Co0.5hydrogen storage alloy produced by conventional casting, annealing and melt-spinning methods are studied. A melt-spun processing is greatly effective for improving the self-discharge properties by changing the microstructural evolution. The x-ray diffraction (XRD) analysis indicates that all three samples contain the major phase of (La, Mg)2Ni7which belongs to the space group of P63/mmc, but the unit-cell volume of (La, Mg)2Ni7phase for the melt-spun alloy is the smallest. The improvement of charge retention rate (CRR) for the three samples at 248 K is more significant than that at 298 K, especially for the melt-spun alloy. An increase of discharge-potential plateau leads to more reversible self-discharge of the alloy electrodes, corresponding to the corrosion degrees. Thus, the melt-spun alloy has the optimal self-discharge performance which is dominated by the reversible self-discharge process.
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