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中文摘要：
为了提高La-Mg-Ni系A2B7型贮氢合金的电化学循环稳定性,添加少量Si,用铸造工艺制备了La0.75Mg0.25Ni3.3Co0.2Six（x=0,0.05,0.1,0.15,0.2）贮氢合金,分析并测试了其微观结构、电化学性能以及氢扩散系数。结果表明,合金具有多相结构,主相由CaCu5型相和Ce2Ni7型相组成。随着Si元素含量的增加,合金中的CaCu5型相逐渐增加,Ce2Ni7型相则相应减少。Si元素的添加提高了合金的循环稳定性,但使合金的最大放电容量下降,同时也不利于放电电压特性和氢在合金体内的扩散,这与Si添加使合金中各相的相对含量发生改变和合金表面的钝化现象有关。
英文摘要：
In order to improve the electrochemical cycle stability of La-Mg-Ni system（A2B7-type） hydrogen storage alloy,the Si is slightly added in the alloy.La0.75Mg0.25Ni3.3Co0.2Six（x=0,0.05,0.1,0.15,0.2） hydrogen storage alloys were prepared by casting.The electrochemical performances and microstructures of the alloys were determined and measured,at the same time,the hydrogen diffusion coeffcient were measured,The obtained results show that the alloys are multi-phase structure and are composed of the CaCu5-type phase and the Ce2Ni7-type phase.The amount of the CaCu5-type phase gradually increases with the increase of Si content,but the amount of the Ce2Ni7-type phase correspondingly decreases.The addition of Si enhances the cycle stability of the alloys,but is harmful to the discharge potential characteristics and the hydrogen diffusion in the alloys bulk,this is relate to the adding of Si which changes the relative content of the phase in the alloys and makes the passivation phenomenon on the surface of alloy.
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