Effect of the temperature on electrode performance of the as cast La0.7Mg0.3(NiMnCo)(3.5) alloy

摘要

A series of experiments were performed to investigate the effect of the temperature on electrode performance of the as-cast La0.7Mg0.3(NiMnCo)(3.5) alloy. XRD and SEM show that La0.7Mg0.3(NiMnCo)(3.5) alloy has LaNi5 and La2Ni7 phase. The activation curves show that the as-cast La0.7Mg0.3(NiMnCo)(3.5) alloy electrode can be activated in three times and the maximum discharge capacity is 358.74 mA h/g at 273 K. With increasing the temperature, the cyclic stability of the alloy electrode decreases obviously. And the capacity retention decreases from 96.14 to 63.53% when the temperature increases from 238 to 303 K. It also can be seen that the as-cast La0.7Mg0.3(NiMnCo)(3.5) alloy electrode has the best self-discharge ability at 238 K and the best high-rate discharge ability at 273 K.