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中文摘要：
采用固相扩散法制备La0.7Mg0．3Ni3.5-xAlx（x=0，0．1，0-3，0．7，1．0）和La0.7Mg0．3Ni3.5-xAlx（x=0，0．1，0．2，0-3，0．4）贮氢合金，采用x射线衍射、能谱分析及循环伏安等方法分析合金的相结构和电极电化学性能，研究元素A1替代对合金电化学性能的影响。结果表明：合金由LaNi5、La2Ni7和LaNi3三相组成，随着Al替代量的增加，La2Ni，相晶胞逐渐膨胀，LaNi5相大量减少，LaNi3相增加，La2Ni7相有利于合金电化学性能的提高，然而过高的Al含量会对合金的放电性能带来不利影响。La0.7Mg0.3Ni3.4Al0.1和La0.7Mg0.3Ni2.8Co0.6Al0.1合金电极的最大放电容量分别为354．5mA·h／g和373．1mA·h／g。循环伏安测试显示较明显的氧化峰和还原峰，且峰电位差较小，反映合金电极较好的吸放氢反应可逆性。
英文摘要：
La0.7Mg0.3Ni3.5-xAlx （x=0, 0.1, 0.3, 0.7, 1.0） and Lao.7Mg0.3Ni2.8Co0.7-xAlx （x=0, 0.1, 0.2, 0.3, 0.4） hydrogen storage alloys were prepared by solid diffusion reaction under Ar atmosphere. The phase structures of alloys were analyzed by X-ray diffraction （XRD）, as well as the electrochemical performance of alloy electrode with cyclic voltammetry（CV）and charge/discharge test, so as to investigate the effect of Al substitution on electrode characteristics. The results show that all alloys are composed of LaNi5, La2Ni7 and LaNi3 phases. With the increase ofx value, the cell volume of La2Ni7 phase enlarges and the content of LaNi5 phase becomes low markedly, while the content of LaNi3 phase increases. LazNi7 phase can be favorable to improve charge/discharge properties of alloy electrode. However, excessive content of AI has a negative impact on the discharge performance of alloys. The maximum values are 354.5 mA.h/g and 373.1 mA.h/g for Lao.7Mg0.3Ni3.4Al0.1 and Lao.7Mg0.3Ni2.sCo0.6Al0.1 electrodes, respectively. Cyclic voltammetry results indicate that the significant peaks responding to oxidation and reduction reactions and small difference between peak potentials mean good reversibility of the electrode during charge/discharge reaction.
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