Li Jinhua (Inner Mongolia Rare Earth Ovonic Metal Hydride Co. Ltd. , Baotou 140030, China)
<正> Rare earth-based hydrogen storage alloy used as negative electrode materials for nickel-metal hydride (NiMH) batteries are used commercially. The effect of annealing treatment with different annealing temperature and time on the MLNi3.68Co0.78Mn0.35 Al0.27 and MMNi3.55Co0.75Mn0.40 Al0.30 alloys were investigated. The crystal microstructure, pressure-composition-isotherms (p-C-T) and electrochemical properties of alloys were examined by X-ray diffraction (XRD), automatic PCI monitoring system and electrical performance testing instruments. The optimum annealing treatment conditions of two kinds of alloys were determined.
hydrogen storage alloys; annealing; rare earths
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