Electrochemical hydrogen storage performance of as-cast and as-spun RE-Mg-Ni-Co-Al-based alloys applied to Ni/MH battery  

MH/Ni电池用铸态及快淬态RE-Mg-Ni-Co-Al基合金的电化学储氢性能（英文）

作　　者：Yang-huan ZHANG Ya-qin LI Hong-wei SHANG Zhong-hui HOU Yan QI Dong-liang ZHAO 张羊换;李亚琴;尚宏伟;侯忠辉;祁焱;赵栋梁(内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,包头014010;钢铁研究总院功能材料研究所,北京100081;北京科技大学新材料技术研究院,北京100083)

机构地区：[1]Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-metal Resources,Inner Mongolia University of Science and Technology,Baotou 014010,China [2]Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,China [3]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第4期711-721,共11页中国有色金属学报（英文版）

基　　金：Projects(51761032,51471054)supported by the National Natural Science Foundation of China;Project(2015MS0558)supported by the Natural Science Foundation of Inner Mongolia,China

摘　　要：The La-Mg-Ni-Co-Al-based AB2-type La0.8-xCe0.2YxMgNi3.4Co0.4Al0.1(x=0,0.05,0.1,0.15,0.2)alloys were prepared via melt spinning.The analyses of the X-ray diffraction(XRD)and scanning electron microscopy(SEM)proved that the experimental alloys contain the main phase LaMgNi4 and the second phase LaNi5.Increasing Y content and spinning rate lead to grain refinement and obvious change of the phase abundance without changing phase composition.Y substitution for La and melt spinning make the life-span of the alloys improved remarkably,which is attributed to the improvement of anti-oxidation,anti-pulverization and anti-corrosion abilities.In addition,the discharge capacity visibly decreases with increasing the Y content,while it firstly increases and then decreases with increasing spinning rate.The electrochemical kinetics increases to the optimum performance and then reduces with increasing spinning rate.Moreover,all the alloys achieve to the highest discharge capacities just at the initial cycle without activation.采用快淬方式制备La-Mg-Ni-Co-Al基AB_2型La_(0.8-x)Ce_(0.2)Y_xMg Ni_(3.4)Co_(0.4)Al_(0.1)(x=0,0.05,0.1,0.15,0.2)合金。XRD、SEM分析表明,实验合金包含主相La Mg Ni_4和第二相La Ni_5。增加Y含量和淬速导致晶粒细化及相丰度明显改变,但不改变相组成。元素Y替代La元素和快淬使合金寿命明显改善,这归因于抗氧化、抗粉化和抗腐蚀能力的改善。另外,放电容量随Y含量的增加明显减小,而随淬速的增加先增加后下降。电化学动力学随淬速的增加先增加到最佳性能然后再下降。所有合金在第一次循环过程中就达到最大放电容量,不需要活化过程。

关 键 词：Y La substitution spinning rate life-span discharge capacity electrochemical kinetics 

分 类 号：TG139.7[一般工业技术—材料科学与工程]