合金结构研究表明,La2-xMgxNi7(x=0.3～0.8)主要由Ce2Ni7,Gd2Co7,PuNi3型物相组成.合金中Mg含量对合金相结构有着重要影响,主相的晶胞参数随Mg含量(x)的增加呈线性减小,合金的吸放氢平台也随之升高.电化学测试表明,随合金中Mg含量的增加,合金电极的放电容量先增大后减小,合金电极的循环稳定性呈恶化趋势,La1.4Mg0.6Ni7合金电极具有最高的电化学放电容量(378 mAh·g-1),La1.6Mg0.4Ni7合金电极具有最佳的循环稳定性(S270=81%).合金电极的高倍率放电性能(HRD)随Mg含量的增加而增大.当合金中Mg含量较低时(x≤0.5),合金电极反应速度控制步骤为氢在合金体相中的扩散;当Mg含量较高时(x≥0.5),合金电极反应速度控制步骤转变为电极表面的电荷转移.
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