Effect of rapid quenching on the electrochemical properties of AB5 and AB3.5-type hydrogen storage alloys was studied. The results indicated that the discharge capacities of the rapid quenching MmNi3.55 Co0.75 Mn0.4Al0.3 alloys decrease under 25 and -35℃ with the increase of the quenching rate. Comparatively, the decrease extent of the quenching alloys at -35℃ is lower than that at 25℃. The result on the study of the cycle life indicated that the quenching process was favorable to improve the cycle stabilities of the MmNi3.55Co0.75-Mn0.4Al0.3alloys under 25 and -35℃. Whereas, the effect of the quenching process on the La0.7Mg0.3(Ni0.85Co0.15)3.5 alloy was different at 25℃ from at -35℃. Under 25℃, the cycle life of the alloy was obviously improved by the quenching process, however, the quenching process did not improve but decreased slightly the cycle life at -35℃.
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