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Effect of Ni/(La+Mg) Ratio on Structure and Electrochemical Performance of La-Mg-Ni Alloy System
作者姓名:DONG Xiao-ping  YANG Li-ying  ZHANG Yang-huan  WANG Xin-lin
作者单位:[1]College of Quality and Technical Supervision, Hebei University, Baoding 071002, Hebei, China [2]Department ofFunctional Material Research, China Iron and Steel Research Institute Group, Beijing 100081, China
基金项目:国家自然科学基金,内蒙古自然科学基金,Science and Technology Planned Project of Inner Mongolia of China
摘    要:

关 键 词:LaNi5  香格里拉  合金系统  电化学性能  循环稳定性    结构  活化能力

Effect of Ni/(La+Mg) Ratio on Structure and Electrochemical Performance of La-Mg-Ni Alloy System
DONG Xiao-ping,YANG Li-ying,ZHANG Yang-huan,WANG Xin-lin.Effect of Ni/(La+Mg) Ratio on Structure and Electrochemical Performance of La-Mg-Ni Alloy System[J].Journal of Iron and Steel Research,2009,16(3):83-88.
Authors:DONG Xiao-ping  YANG Li-ying  ZHANG Yang-huan  WANG Xin-lin
Affiliation:1. College of Quality and Technical Supervision,Hebei University,Baoding 071002,Hebei,China
2. Department of Functional Material Research,China Iron and Steel Research Institute Group,Beijing 100081,China
Abstract:As the alloy with the most suitable Ni/(La+ Mg) ratio has higher capacity and good cycle stability,theeffects of Ni/(La+Mg) ratios on the electrochemical performances of the La0.80 Mg0.20 Nix (x= 3.5 to 5.0) alloys have been investigated to find the most suitable Ni/(La+ Mg) ratio.The results of XRD and SEM observations show that the phase composition of the alloys varies with different Ni/(La+Mg) ratios.When Ni/(La+Mg) is notmore than 4.25,all the alloys contain LaNi5 and (La,Mg)2Ni7 phases,in addition,the LaMg and (La,Mg)Ni3 phases exist in the x=3.5 and 3.75 alloys,respectively.The LaMg2Ni9 phase exists in the x=4.25 alloy.There are the LaNi5 and LaMg2 Ni9 phases in the x= 4.5,4.75,and 5.0 alloys.The phase abundance and cell volume change with different Ni content.When the Ni/(La+Mg) ratio is not more than 4.25,the alloys possess excellent activation capability,however,the activation capabilities of the alloys decrease with a further increase in the Ni/(La+Mg)ratio.With increasing the Ni/(La+ Mg) ratio,the maximum discharge capacities,the medium voltages,and the cycle stabilities of the alloys first increase and then decrease.When the Ni/(La+Mg) ratio is 3.75,the corresponding alloyhas the maximum discharge capacity among all the alloys.However,the cycle stability of the Ni/(La+ Mg)= 4.0 alloy is better than that of the others.
Keywords:Ni/(La+ Mg) ratio  La-Mg-Ni alloy system  structure characteristic  electrochemical performance
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