Study on phase structure and electrochemical properties of Ml1−xMgxNi2.80Co0.50Mn0.10Al0.10 (x = 0.08, 0.12, 0.20, 0.24, 0.28) hydrogen storage alloys
Study on phase structure and electrochemical properties of Ml1−xMgxNi2.80Co0.50Mn0.10Al0.10 (x = 0.08, 0.12, 0.20, 0.24, 0.28) hydrogen storage alloys
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DOI：
10.1016/j.electacta.2007.03.040
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发表时间：
2007-05
影响因子：
6.6
通讯作者：
Yuan Li;Shumin Han;Jinhua Li;Lin Hu
中科院分区：
文献类型：
--
作者：
Yuan Li;Shumin Han;Jinhua Li;Lin Hu
Phase structure and electrochemical properties of the Ml1−xMgxNi2.80Co0.50Mn0.10Al0.10(x=0.08, 0.12, 0.20, 0.24, 0.28) (Ml=La-rich mixed lanthanide) alloys were studied. X-ray diffraction (XRD) analysis and Rietveld refinement show that the alloys consist mainly of LaNi5and (La,Mg)Ni3phase. Due to variation in phases of the alloys, the maximum discharge capacity, the high rate dischargeability (HRD), and the low temperature dischargeability increase first and then decrease. The maximum discharge capacity increases from 322mAhg−1(x=0.08) to 375mAhg−1(x=0.12), and then decreases to 351mAhg−1(x=0.28) with increasing x. As the case of x=0.20, HRD at 1200mAg−1and discharge capacity at 233K reaches 41.7% and 256mAhg−1, respectively. The cycling stability is improved by substituting La with Ml and B-site multi-alloying, and the capacity retention of Ml0.72Mg0.28Ni2.80Co0.50Mn0.10Al0.10at the 200th cycle is 71%.
