Abstract：Abstract: The present study aims to investigate the effect of Y content of non stoichiometric alloy, the AB3.3 type La3-xYxNi9.1Mn0.5Al0.3 (x=1.0~2.2) hydrogen storage alloys are prepared by a vacuum induction-quenching process followed by annealing under 1148 degree Kelvin in argon. The effect of Y on the phase structure and electrochemical properties of the alloys are investigated systematically via X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical measurement. The phase structure analysis of the alloys showed that La3-xYxNi9.1Mn0.5Al0.3 (x=1.0~2.2) are composed of AB3 phases such as CeNi3 type and PrCo3 type，and A2B7 phases such as Ce2Ni7 and Gd2Co7. With the increase of Y content, the content of AB3 phases in the alloy reduce, and the content of A2B7 phases increase. When x=2.2, the phase abundance of alloy A2B7 type can reach 94.86%; 1Cmax=329.3mAh/g; S100=87.7%; HRD900=81.77%. The dynamic performance of the alloy electrode is determined by the diffusion of hydrogen atom in the alloy, which is also the main factor affecting its high rate discharge performance.
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2020, Vol. 27 