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Abstract
La0.7Mg0.3Ni3.5 hydrogen storage alloy for hybrid car batteries was prepared by ingot and quenching method, comparative analysis of the hydrogen storage properties and phase composition of La0.7Mg0.3Ni3.5 hydrogen storage alloy ingot and sheet, together with the effect of heat treatment temperature on hydrogen storage properties, phase composition and morphology of La0.7Mg0.3Ni3.5 hydrogen storage alloys. The results show that, at the beginning of hydrogen, the hydrogen desorption rate of the cast alloy is close to that of the rapid quenched; but with the prolongation of time, the hydrogen desorption rate and hydrogen desorption capacity of hydrogen storage alloy sheet prepared by rapid quenching method are larger. Hydrogen storage alloy ingot before and after heat treatment are composed of LaNi5 and (LaMg)2Ni7, in which the (LaMg)2Ni7 phase content increases firstly and then decreases with the increase of annealing temperature, and gets the maximum value at 900 ℃. The phase composition of La0.7Mg0.3Ni3.5 hydrogen storage alloy sheet prepared by rapid quenching method are LaNi5, (LaMg)Ni3 and (LaMg)2Ni7, and the (LaMg)Ni3 phase disappears after heat treatment. The hydrogen capacity and hydrogen desorption of heat treated La0.7Mg0.3Ni3.5 hydrogen storage alloy ingot are relatively improved compared with the alloy without heat treatment, and the maximum hydrogen absorption capacity is obtained at 900 ℃. The hydrogen platform and hydrogen desorption of La0.7Mg0.3Ni3.5 hydrogen storage alloy sheet before and after heat treatment are similar, and the hydrogen desorption at 900 ℃ are slightly higher than that of other status. © 2017, Editorial Office of "Jinshu Rechuli". All right reserved.
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