Phase structure and electrochemical properties of La_(0.7)Ce_(0.3)Ni_(3.75)Mn_(0.35)Al_(0.15)Cu_(0.75-x)Fe_x hydrogen storage alloys  

La_(0.7)Ce_(0.3)Ni_(3.75)Mn_(0.35)Al_(0.15)Cu_(0.75-x)Fe_x合金的相结构和电化学储氢性能(英文)

作　　者：刘宝忠[1,2] 李安铭[1] 范燕平[1] 胡梦娟[1] 张宝庆[1] 

机构地区：[1]河南理工大学材料科学与工程学院,焦作454000 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第11期2730-2735,共6页中国有色金属学报（英文版）

基　　金：Project (51001043) supported by the National Natural Science Foundation of China;Project (NCET2011) supported by Program for New Century Excellent Talents in University, China;Project (201104390) supported by China Postdoctoral Science Special Foundation;Project (20100470990) supported by China Postdoctoral Science Foundation;Project (2012IRTSTHN007) supported by Program for Innovative Research Team (in Science and Technology) in the University of Henan Province, China;Project (2011J1003) supported by Baotou Science and Technology Project, China;Project (B2010-13) supported by the Doctoral Foundation of Henan Polytechnic University, China

摘　　要：La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-xFex （x=0-0.20） hydrogen storage alloys were synthesized by induction melting and subsequent annealing treatment, and phase structure and electrochemical characteristics were investigated. All alloys consist of a single LaNi5 phase with CaCu5 structure, and the lattice constant a and the cell volume （V） of the LaNi5 phase increase with increasing x value. The maximum discharge capacity gradually decreases from 319.0 mA？h/g （x=0） to 291.9 mA？h/g （x=0.20） with the increase in x value. The high-rate dischargeability at the discharge current density of 1200 mA/g decreases monotonically from 53.1% （x=0） to 44.2% （x=0.20）. The cycling stability increases with increasing x from 0 to 0.20, which is mainly ascribed to the improvement of the pulverization resistance.采用感应熔炼和热处理的方法制备La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-xFex（x=0-0.20） 合金，并研究合金的相结构和电化学储氢性能。全部合金均为单一的具有CaCu5结构的LaNi5相，LaNi5相的晶格常数a和晶胞体积随着x值的增加而增大。最大放电容量随着x值的增加从319.0 mA.h/g（x=0）降低到291.9 mA？h/g（x=0.20）。在1200 mA/g的电流密度下HRD值从53.1%（x=0）降低到44.2%（x=0.20）。合金电极的循环稳定性随着x值的增加而增强，这主要归因于合金抗粉化能力的增强。

关 键 词：hydrogen storage alloy AB5-type hydrogen storage alloys phase structures electrochemical property KINETICS Ni-MH battery LaNi5 phase 

分 类 号：TG139.7[一般工业技术—材料科学与工程]