Mn替代Ni对(La_(0.8)Nd_(0.2))_2Mg(Ni_(0.9-x)Co_(0.1)Mn_x)_9合金储氢及电化学性能的影响  

Effect of Mn Substitution for Ni on Hydrogen Storage Properties and Electrochemical Characteristics of(La_(0.8)Nd_(0.2))_2Mg(Ni_(0.9-x)Co_(0.1)Mn_x)_9 Alloys

作　　者：覃铭[1,2] 刘淑辉[1,2] 卿培林[1,2] 蓝志强[1] 郭进[1] 

机构地区：[1]广西大学物理科学与工程技术学院,南宁530004 [2]百色学院物理与电信工程系,百色533000

出　　处：《材料导报》2011年第16期35-39,共5页Materials Reports

基　　金：国家自然科学基金(5056100250861003);广西自然科学基金重点项目(2010GXNSFD013004);百色学院科研项目(2010KB15GBK2010008)

摘　　要：在Ar保护下采用磁悬浮感应熔炼制备(La0.8Nd0.22)Mg(Ni0.9-xCo0.1Mnx)9(x=0,0.05,0.1,0.15)合金,系统研究了元素替代及退火处理对合金相结构、吸放氢性能及电化学性能的影响。结果表明,合金相主要由(La,Nd)Ni5相、LaMg2Ni9相和(La,Nd2)Ni7相组成,当x=0.15时,(La,Nd)2Ni7相消失。随着Mn取代量的增加,合金的储氢量、放电容量先增加后减小,Mn的添加提高了合金的充放电循环稳定性。经1073K退火处理后合金的放电容量得到提高,循环稳定性能得到明显改善。（La0.8Nd0.2）2Mg（Ni0.9-xCo0.1Mn3）9 （x=0,0. 05,0. 1,0. 15） alloys were prepared by magnetic levitation melting under the protection of Ar atmosphere. The effects of both Mn substitution for Ni and the annealing treatment on the phase structure, hydrogen storage properties and electrochemical characteristics were studied syste- matically. The results show that the alloy phase is mainly composed of （La, Nd） Ni5, LaMg2 Ni9 and （La, Nd） 2 Ni7 phase. When x=0. 15, the （La, Nd）2 NiT phase disappears. The hydrogen storage capacity and discharge capacity first increase and then decrease with the increase of Mn content. The charge/discharge cycle stability of the alloys is improved with Mn element added. Compared with as-cast alloy, the discharge capacity and charge/discharge cycle stability of the alloys are enhanced by annealed at 1073K.

关 键 词：储氢合金 PCT性能 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]