Structural and electrochemical properties of high-capacity Ml-Mg-Ni-based hydrogen storage alloys |
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| Authors: | Shumin Han Yuan Li Zhong Zhang Xilin Zhu Jinhua Li Lin Hu |
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| Institution: | (1) School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, China;(2) State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China |
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| Abstract: | The Ml-Mg-Ni-based (Ml = La-rich mixed lanthanide) hydrogen storage alloy Ml0.88Mg0.12Ni3.0-Mn0.10Co0.55Al0.10 was prepared by inductive melting. The micro-structure was analyzed by XRD and SEM. The alloy consists mainly of CaCu5-type phase, Ce2Ni7-type phase and Pr5Co19-type phase. The electrochemical measurements show that the maximum discharge capacity is 386 mAh/g, 16.3% higher than that
of the commercial AB5-type alloy (332 mAh/g). At discharge current density of 1 100 mA/g, high rate dischargeability is 62%, while that of the
AB5-type alloy is only 45%. The discharge capacity decreases to 315 mAh/g after 300 charge/ discharge cycles, 81.5% of the
maximum discharge capacity.
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Translated from Journal of Xi’an Jiao Tong University, 2008, 42(3) (in Chinese) |
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| Keywords: | Ni/MH batteries hydrogen storage alloys Ml-Mg-Ni-based alloys electrochemical properties |
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