【摘要】 为了改善镍电极的高温充电效率,采用机械混合的方式将球形Ni(OH)2与不同比例的Lu2O3混合后制成粘结式镍正极。充放电测试、循环伏安和XRD等实验结果表明,掺杂Lu2O3后镍电极的析氧过电位明显提高,高温充电效率得到了很大改善,在充电后的电极中βNiOOH生成;而且Lu2O3的掺杂比例对镍电极的高温性能在不同的充放电倍率下有不同程度的影响,3.5%是最好的掺杂比例,掺杂对高温小电流充电效率的改善作用要大于高温大电流充电。更多还原

【Abstract】 Nickel-metal hydride （Ni/MH） batteries are one of promising batteries for electric vehicle applications, but at high temperature the charge efficiency of nickel electrode is very low. In order to improve the high-temperature-efficiency of nickel electrode, spherical nickel hydroxide mixed with various ratios of Lu₂O₃ was used as active material of pasted nickel electrodes. The results of charge/discharge experiments, cyclic voltammetric measurements and XRD characterizations show that after addition of Lu₂O₃, the oxygen evolution overpotential is elevated much, the charge efficiency of nickel electrode at high temperature is improved greatly and the content of β-NiOOH phase increases in charged electrodes. In addition, the mixed ratio of Lu₂O₃ has different effects on high temperature performances of nickel electrode at different charge/discharge currents, 3.5% is the optimum mixed ratio, and the action of Lu₂O₃ on high temperature electrochemical behaviours is more apparent when nickel electrodes are charged at small current than large current.更多还原