Electrochemical hydrogen storage behaviour of as-cast and as-spun RE–Mg–Ni–Mn-based alloys applied to Ni–MH battery

摘要: La–Mg–Ni–Mn-based AB2-type La1–xCexMgNi3.5Mn0.5 (x = 0, 0.1, 0.2, 0.3, 0.4) alloys were fabricated by melt spinning. X-ray diffraction and scanning electron microscopy revealed that the experimental consisted of a major phase LaMgNi4 secondary LaNi5. The Ce substitution for La spinning refined grains clearly. Electrochemical tests showed as-cast as-spun exhibited excellent activation capability. With increase in rate content, discharge capacities initially increased then decreased, whereas their cycle stabilities always increased. Moreover, electrochemical kinetics decreased with growth content rate. reason leading to capacity degradation alloy electrodes was determined be pulverisation particles corrosion oxidation surface.