Structures and electrochemical performances of as-cast and spun RE-Mg-Ni-Mn-based alloys applied to Ni-MH battery

作     者：Yang-huan Zhang Zhong-hui Hou Ying Cai Hong-wei Shang Yan Qi Dong-liang Zhao 

作者机构：Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal ResourcesInner Mongolia University of Science and Technology Department of Functional Material ResearchCentral Iron and Steel Research Institute 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2017年第24卷第3期

页      面：296-305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 sponsored by National Natural Science Foundation of China(51371094 and 51471054) 

主　　题：AB2-type alloy Substitution Spinning treatment Electrochemical kinetics Cycle stability Ni-MH battery 

摘      要：The RE-Mg-Ni-Mn-based AB2-type La（1-x）CexMgNi（3.5）Mn（0.5）（ x = 0- 0. 4） alloys were prepared by spinning treatment. For obtaining the optimum performance,the effects of Ce content and spinning rate on the hydrogen storage performance of the alloys were studied systematically. The results show that the variations of the spinning rate and Ce content result in noteworthy changes of the phase content without altering phase composition of the alloys. Specifically,the LaMgNi4 phase increases and LaNi5 phase decreases when increasing the spinning rate and Ce content. Furthermore,the crystalline grains of Cecontaining alloys prepared by spinning treatment are remarkably refined. The alloys own superior electrochemical performance. All alloys reach the optimal discharge capacity at the initial cycle. Increasing Ce content and spinning rate lead the discharge capacity and electrochemical kinetics rise to an optimal value and then start to reduce. Meanwhile,the electrochemical cycle stability is also improved,which is ascribed to the great enhancement of anti-pulverization and anti-corrosion abilities resulting from the spinning treatment and the substitution of Ce for La.