Effect of Lu2O3 on Charge/discharge Performances of Spherical Nickel Hydroxide at High Temperature
来源期刊：JOURNAL OF RARE EARTHS2005年第6期
论文作者：Ren Junxia Li Yuzhan Yan Jie Wang Xiaojian Gao Xueping
Key words：spherical nickel hydroxide; high temperature performances; Lu2O3; oxygen evolution overpotential; rare earths;
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 have shown that after addition of Lu2O3, the oxygen evolution overpotential is elevated much, the charge efficiency of nickel electrode at high temperature is greatly improved 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 behaviors is more apparent when nickel electrodes are charged at small current than large current.
Ren Junxia1，Li Yuzhan1，Yan Jie1，Wang Xiaojian1，Gao Xueping1
(1.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China)
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 have shown that after addition of Lu2O3, the oxygen evolution overpotential is elevated much, the charge efficiency of nickel electrode at high temperature is greatly improved 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 behaviors is more apparent when nickel electrodes are charged at small current than large current.
Key words:spherical nickel hydroxide; high temperature performances; Lu2O3; oxygen evolution overpotential; rare earths;
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