Study on electrochemical property of La_0.75Mg_0.25Ni_2.85Co_0.45–x（AlSn）_x （x=0.0,0.1,0.2,0.3） alloys

蓝志强^1,2，李家丞¹，魏冰¹，祝蓉蓉¹，郭进^1,2

1. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology,College of Physics Science and Technology,Guangxi University2. Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials,School of Materials Science and Engineering,Guilin University of Electronic Technology

摘 要：La_0.75Mg_0.25Ni_2.85Co_0.45–x（AlSn）_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 to x=0.0, the Cmax and C150 were 348.9 and 185 mA h/g, respectively, then for the alloy electrode with x=0.2, even though the Cmax was only 309.0 mA h/g less than 348.9 mA h/g, the C150 of 231 mA h/g was much higher than 185 mA h/g. And the values of the limit current density, anodic peak current density and hydrogen diffusion coefficient of the La0.75Mg0.25Ni2.85Co0.35（AlS n）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 suggested that the kinetic property of the La_0.75Mg_0.25Ni_2.85Co_0.45–x（AlSn）_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.

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