Abstract
Hydrogen strorage alloys with formula La 1.5Mg 0.5Ni 7 were prepared by induction melting followed by different annealing treatments (1073, 1123 and 1173 K) for 24 h. The alloy composition, alloy microstructure and electrochemical properties were investigated, respectively. The results showed that the multi-phase structure of as-cast alloy was converted into a double-phase structure (Gd 2Co 7-type phase and Ce 2Ni 7-type phase) through annealing treatments. Mg atoms were mainly located in Laves unit of Gd 2Co 7-type unit cell and Ce 2Ni 7-type unit cell. The electrochemical capacity of alloy electrodes after annealing treatment could be up to 390 mAh/g. The cyclic stability of alloy electrodes was significantly improved by annealing treatments; After 150 charge/discharge cycles, the capacity retention ratio of alloy annealed at 1173 K was the highest (81.9%). The high rate dischargeability of alloy electrodes was also improved due to annealing treatment.
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