La2Mg4-xCaxNi13贮氢合金的相结构与电化学性能  

Phase structures and electrochemical properties of La2Mg4-xCaxNi13 hydrogen storage alloys

作　　者：柳东明[1] 王常春[1] 斯庭智[1] 张庆安[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《功能材料》2007年第A04期1619-1621,共3页Journal of Functional Materials

摘　　要：以La2Mg4-xCaxNi13合金为基础，研究了Ca部分替代Mg对合金相结构和电化学性能的影响。XRD和Rietveld分析表明，随ca替代量的增加，合金中MgNi2相含量逐渐减少，（La，Ca，Mg）Ni3相含量则先增加后减少；同时，ca的添加改变了La2Mg4-xCaxNi13合金中主相的晶格常数。电化学测试表明，ca部分替代Mg能够大幅提高合金电极的放电容量，其中La2Mg4-xCaxNi13合金具有最大的放电容量350．5mAh／g。The effect of partial substitution of Mg by Ca on the phase structures and electrochemical properties of the La2Mg4Ni13 alloy was investigated. The results indicate that with the increase of the content of Ca, the phase abundance of Mg2Ni decreases gradually, and the abundance of （La, Ca, Mg）Ni3 phase increases at first and then decreases. Furthermore, the lattice parameters of the main phases （La, Ca, Mg）Nis and （La, Ca）（La, Mg）Ni4 are influenced significantly by the addition of Ca. Among the studied La2Mg4-xCaxNi13 （x=0, 0.5, 1.0, 1.5, 2.0, 2.5） alloys, the La2Mg2Ca2Ni13 alloy has the highest discharge capacity （350.5 mAh/g）.

关 键 词：贮氢合金 La2Mg4-xCaxNi13合金 相结构 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]