Abstract：The rare earth based over-stoichiometric AB5 type hydrogen storage alloys of La0.85-xCe0.15SmxNi4.55Mn0.40Al0.30 and La0.69Ce0.31-xSmxNi4.55Mn0.40Al0.30 (x = 0, 0.08, 0.16) were prepared by vacuum induction melting ingot casting and rapid quenching. The effects of Sm additive and rapid quenching on the microstructure, hydrogen absorb and desorb property, electrochemical property, powdering and oxidation of the experimental alloys were investigated. The results show that the hydrogen storage alloy prepared by casting has a CaCu5-type phase structure. With the increase of Sm content, the lattice parameter, unit cell volume and hydrogen storage property change a little, but the cycle stability and anti-powdering property increase obviously. Compared with the casting process, the rapid quenching process can effectively improve the electrochemical cycle stability of the alloy.
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2022, Vol. 29 