Abstract
The influence of melt spinning on the structural and electrochemical performances of A2B7-type La0.65Ce0.1Mg0.25Ni3Co0.5 alloy electrodes at 298, 268, 258 and 248 K is investigated. The Rietveld refinement result reveals that the melt-spun alloys are mainly composed of (La, Mg)Ni3, (La, Mg)2Ni7 and LaNi5 phase, as the spinning rate is enhanced from 0 (the as-cast is defined as the spinning rate of 0 m s−1) to 30 m s−1, the abundance of LaNi5 phase increases while that of (La, Mg)Ni3 and (La, Mg)2Ni7 phase shares a reverse trend. The electrochemical measurement indicates that the cyclic stability of 100 charge/discharge cycles of the La0.65Ce0.1Mg0.25Ni3Co0.5 alloy increases with the rising of spinning rate. When the spinning rate is 10 m s−1, the discharge capacity of the 100th cycle for the La0.65Ce0.1Mg0.25Ni3Co0.5 alloy reaches the maximum value ranging from 245.9 to 268.3 mAh g−1 within the test temperature ranging from 248 to 298 K, and the high rate discharge ability of the alloy also reaches the optimum value. Thus the La0.65Ce0.1Mg0.25Ni3Co0.5 alloy exhibits optimum electrochemical properties when the spinning rate is 10 m s−1.
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