
Structural and electrochemical properties of high-capacity Ml-Mg-Ni-based hydrogen storage alloys
Shumin HAN, Yuan LI, Zhong ZHANG, Xilin ZHU, Jinhua LI, Lin HU
Front. Chem. China ›› 2009, Vol. 4 ›› Issue (1) : 48-51.
Structural and electrochemical properties of high-capacity Ml-Mg-Ni-based hydrogen storage alloys
The Ml-Mg-Ni-based (Ml= La-rich mixed lanthanide) hydrogen storage alloy Ml0.88Mg0.12Ni3.0Mn0.10Co0.55Al0.10 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.
Ni/MH batteries / hydrogen storage alloys / Ml-Mg-Ni-based alloys / electrochemical properties
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