化学计量比对无镨钕贮氢合金结构与性能影响  

Effects of Stoichiometric Ratio on Structure and Properties of Hydrogen Storing Alloy without Praseodymium and Neodymium

作　　者：尹亮亮 蔡颖[1] Yin Liang-liang;Cai Ying(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia Autonomous Region,China;Inner Mongolia Rare Earth Ovonic High-power Battery Co.,Ltd.,Baotou 014030,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古稀奥科镍氢动力电池有限公司,内蒙古包头014030

出　　处：《包钢科技》2020年第1期22-25,共4页Science & Technology of Baotou Steel

摘　　要：通过感应熔炼法制备了La 0.75 Ce 0.25(NiCoMnAl)x(x=4.95,5.05,5.15,5.25)系列合金,对该系列合金进行了XRD测试并分析了合金的相结构;采用双电极方法测试了其电化学性能,并对其进行了PCT气态吸放氢测试。结果表明:四个样品均为CaCu 5结构的LaNi 5相,化学计量比调整没有改变合金的相组成;合金的最大吸氢量随化学计量比的增大而逐渐减小,平台压力先降低后逐渐增大;随着化学计量比的逐渐增加,合金的放电容量逐渐减小;高倍率性能先升高后降低,当计量比为5.05时合金的3C HRD值达到最大为89.6%;合金的循环稳定性随化学计量比的增大而提高。In the paper,it is introduced the La 0.75 Ce 0.25(NiCoMnAl)x(x=4.95,5.05,5.15,5.25)series of alloys were prepared with the induction melting method.The XRD test was carried out for the series of alloys and their phase structure was analyzed;their electrochemical performances were tested with the dual electrodes method and the PCT hydrogenation and dehydrogenation test was carried out.The results showed that all the four samples were with LaNi 5 phase of CaCu 5 structure,their phase composition was not changed by adjusting the stoichiometric ratio;their maximum hydrogen storage capacity decreased with the increase of stoichiometric ratio,their plateau pressure decreased first and then increased;with the gradual increase of stoichiometric ratio,their discharge capacity decreased gradually;the high-rate performance increased first and then decreased,their maximum 3C HRD value reached 89.6%when the stoichiometric ratio was 5.05;their cycling stability was enhanced with the increase of stoichiometric ratio.

关 键 词：化学计量比 相结构 PCT 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]