Abstract：The La1.6Mg0.4Ni7 alloys were prepared by powder sintering, and the effects of different sintering methods on the phase structure and electrochemical properties of the alloys were systematically studied. The results reveal that all the alloys are composed of LaNi5, LaMg2Ni9 and La2Ni7 phases. As the sintering periods growing, the phase abundance of La2Ni7 increases while it’s contrary to LaNi5 phase. The alloy electrodes present good cyclability (S100≥78%) and high-rate discharge ability (HRD900≥83%) but low maximum discharge capacity about 150 mAh/g, and the activation properties become worse with the sintering periods growing. It is found that the activation properties worsen because of decline of phase abundance of LaNi5, and the main reason for good cyclability is that the increase of cell volume of hydrogen absorption reduces the volume expansion rate of particles of alloys during ab-desorbing process, and the high-rate discharge ability is depended on electrochemical reaction rate on the surface of the alloys.
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2022, Vol. 29 