The electrochemical characteristics of AB_(4)-type rare earth-Mg-Ni-based superlattice structure hydrogen storage alloys for nickel metal hydride battery

作     者：Wenfeng Wang Xiaoxue Liu Lu Zhang Shuang Zhang Wei Guo Yumeng Zhao Hongming zhang Yuan Li Shumin Han Wenfeng Wang;Xiaoxue Liu;Lu Zhang;Shuang Zhang;Wei Guo;Yumeng Zhao;Hongming zhang;Yuan Li;Shumin Han

作者机构：State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004PR China School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004PR China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2021年第9卷第6期

页      面：2039-2048页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Natural Science Foundation of Hebei Province(Nos.E2019203414,E2020203081 and E2019203161) the National Natural Science Foundation of China(Nos.51701175 and 51971197) the Innovation Fund for the Graduate Students of Hebei Province(No.CXZZBS2020062) the Doctoral Fund of Yanshan University(No.BL19031) 

主　　题：Nickel metal hydride batteries Hydrogen storage alloys AB_(4)-type superlattice structure Electrochemical performance Kinetics properties 

摘      要：Rare earth-Mg-Ni-based alloys with superlattice structures are new generation negative electrode materials for the nickel metal hydride *** them,the novel AB_(4)-type superlattice structure alloy is supposed to have superior cycling stability and rate *** its preparation is hindered by the crucial requirement of temperature and the special composition which is close to the other superlattice ***,we prepare rare earth-Mg-Ni-based alloy and study the phase transformation of alloys to make clear the formation of AB_(4)-type *** is found Pr_(5)Co_(19)-type phase is converted from Ce_(5)Co_(19)-type phase and shows good stability at higher temperature compared to the Ce_(5)Co_(19)-type phase in the range of 930-970℃.Afterwards,with further 5℃increasing,AB_(4)-type superlattice structure forms at a temperature of 975℃by consuming Pr_(5)Co_(19)-type *** contrast with A_(5)B_(19)-type alloy,AB_(4)-type alloy has superior rate capability owing to the dominant advantages of charge transfer and hydrogen ***,AB_(4)-type alloy shows long lifespan whose capacity retention rates are 89.2%at the 100;cycle and 82.8%at the 200;cycle,***_(4)-type alloy delivers 1.53 wt.%hydrogen storage capacity at room temperature and exhibits higher plateau pressure than Pr_(5)Co_(19)-type *** work provides novel AB_(4)-type alloy with preferable electrochemical performance as negative electrode material to inspire the development of nickel metal hydride batteries.