Cyclic stability and high rate discharge performance of (La,Mg)5Ni19 multiphase alloy

The cyclic stability and high rate discharge performance of (La,Mg)5Ni19 multiphase alloy were investigated in this work. The results show that the alloy is composed of Pr5Co19-type (2H), Ce5Co19-type (3R), CaCu5-type and Ce2Ni7-type phase after annealing at 1123 K. The total phase abundance of Pr5Co19-type (2H) and Ce5Co19-type (3R) is 63.3%. That composition decides the good cyclic stability both in repeated hydriding/dehydriding and charging/discharging process for this alloy. Moreover, the alloy shows the higher high rate discharge capacity at room temperature and it remains 140 mA h/g at the current density of 3600 mA/g.