La0.75Mg0.25Ni2.85Co0.45-x(AlSn)x(x=0.0,0.1,0.2,0.3) alloys were prepared by magnetic induction melting method, and the phase composition and electrochemical properties were investigated systematically. The alloys were mainly composed of LaNi5, La2Ni7 and LaNi3 phase, and the cell volume of LaNi5 increased with the Al and Sn contents. For the alloy corresponding tox=0.0, theCmax andC150 were 348.9 and 185 mAh/g, respectively, then for the alloy electrode withx=0.2, even though theCmaxwas only 309.0 mAh/g less than 348.9 mAh/g, theC150 of 231 mAh/g was much higher than 185 mAh/g. And the values of the limit current density, anodic peak current density and hydrogen diffusion coefficient of the La0.75Mg0.25Ni2.85Co0.35(AlSn)0.1 (x=0.1) alloy were 1079.5, 1023.8 mA/g and 5.71×10–10 cm2/s, respectively. Which were the highest than that of any other electrodes. These results sug-gested that the kinetic property of the La0.75Mg0.25Ni2.85Co0.45–x(AlSn)x(x=0.0, 0.1, 0.2, 0.3) electrodes could be improved effectively by adding moderate contents of Al and Sn.
参考文献
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