La_2Ca_2Mg_2Ni_(13-x)Co_x贮氢合金的相结构和电化学性能  

Phase Structure and Electrochemical Property of La_2Ca_2Mg_2Ni_(13-x)Co_x Hydrogen Storage Alloys

作　　者：方春恒[1] 王常春[1] 柳东明[1] 张庆安[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《安徽工业大学学报（自然科学版）》2009年第2期138-141,共4页Journal of Anhui University of Technology（Natural Science）

摘　　要：研究元素Co部分替代Ni对La2Ca2Mg2Ni13合金相结构和电化学性能的影响。结果表明,La2Ca2Mg2Ni13-xCox(x=0,0.25,0.5,0.75和1.0)系列合金主要由PuNi3型结构的(La,Ca,Mg)(Ni,Co)3相和CaCu5型结构的(La,Ca)(Ni,Co)5相组成,随合金中Co替代量x的增加,PuNi3型主相的含量先增加后降低。当x=0.75时,合金具有最高的放电容量360 mA.h/g,并具有较好的循环稳定性。The effect of partial substitution for Ni by Co on the phase structure and electrochemical property of La2Ca2Mg2Ni13 alloy was investigated. The results indicated that the La2Ca2Mg2Ni13-xCox（x=0,0.05,.5,0.75,1.0）alloys are mainly composed of（La,Ca,Mg）（Ni,Co）3 phase with a PuNi3-type structure and （La,Ca）（Ni,Co）5 phase with a CaCu5-type structure. With the increase of Co content, the phase abundance of PuNi3-type increased firstly and then decreased. When x=0.75, the alloy has maximum discharge capacity of 360 mA·h/g, together with better cycle stability.

关 键 词：贮氢合金 相结构 放电容量 循环稳定性 

分 类 号：TG139.7[一般工业技术—材料科学与工程]