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系统研究了贮氢电极合金La0.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2Bx(x=0,0.02,0.04,0.08)的微结构与电化学性能。XRD结果显示,所有合金均由(La,Mg)Ni3相与LaNi5相组成,B含量的增加导致(La,Mg)Ni3相的丰度不断增加,相应地LaNi5相的丰度逐渐下降。此外,合金的晶格参数与晶胞体积均随B含量的增加而减小。电化学测试分析表明,B的添加可以显著改善合金电极的高倍率放电性能,当B含量为0.04时达到最佳。微量B的加入对合金的循环稳定性能与活化性能影响很小,但降低合金电极的最大放电容量。此外还采用线性极化与阳极极化对合金电极的动力学性能进行了进一步研究。
The microstructure and electrochemical performance of La0.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2Bx (x = 0,0.02,0.04,0.08) alloys were studied systematically. XRD results showed that all the alloys consisted of (La, Mg) Ni3 phase and LaNi5 phase. The increase of B content led to the increase of (La, Mg) Ni3 phase and the decrease of LaNi5 phase abundance. In addition, the lattice parameters of the alloy and the unit cell volume decrease with the increase of B content. Electrochemical tests show that the addition of B can significantly improve the high-rate discharge performance of the alloy electrode, and reach the best when the B content is 0.04. The addition of trace B has little effect on the cycle stability and activation performance of the alloy, but reduces the maximum discharge capacity of the alloy electrode. In addition, linear polarization and anodic polarization were also used to study the kinetic properties of the alloy electrode.