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采用XRD,SEM等材料分析方法及恒电流充放电、线性极化等电化学测试技术研究了低钴LaNi4.5Co0.4-xAl0.1+x(x=0.00～0.30)储氢合金的电极性能。XRD分析表明:合金均为单一CaCu5型六方结构的LaNi5相结构,随着合金中Al含量的增加,其晶胞参数a和c及晶胞体积都显著增加。301 K时模拟电池测试结果表明:x=0.00时,合金电极具有最佳自放电性能;x=0.15时,合金电极的循环稳定性能最好,其高倍率放电性能达到70.21%(放电电流密度为1800 mA.g-1)。当0.10≤x≤0.15时,Al替代Co能改善AB5型低钴储氢合金的循环稳定性能和高倍率放电性能。
The electrode properties of LaNi4.5Co0.4-xAl0.1 + x (x = 0.00 ~ 0.30) hydrogen storage alloys with low cobalt content were studied by means of XRD, SEM and other electrochemical methods such as constant current charge and discharge and linear polarization . XRD results show that all the alloys are LaNi5 phase with a single CaCu5 hexagonal structure. With the increase of Al content, the unit cell parameters a and c and the unit cell volume increase significantly. The results of the simulated battery at 301 K show that the alloy electrode has the best self-discharge performance when x = 0.00; the cycle stability of the alloy electrode is best at x = 0.15, and its high-rate discharge performance reaches 70.21% (discharge current density is 1800 mA.g-1). When 0.10≤x≤0.15, Al substitution for Co can improve the cycle stability and high rate discharge performance of AB5 low cobalt hydrogen storage alloy.