Ti对La_(0.7-x)Ti_xMg_(0.3)Ni_(3.5)(x=0.00,0.05,0.10)合金电极电化学性能的影响  

Effects of Ti on electrochemical properties of La_(0.7-x)Ti_xMg_(0.3)Ni_(3.5) (x=0.00,0.05,0.10) alloy electrodes

作　　者：熊凯[1,2] 梁端[1,2] 马金龙[1,2] 蓝志强[1,2] 刘奕新[1,2] 郭进[1,2] 

机构地区：[1]广西大学有色金属及材料加工新技术教育部重点实验室,广西南宁530004 [2]广西大学物理科学与工程技术学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2010年第6期1041-1045,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50561002;50861003);广西自然科学基金重点项目(2010GXNSFD013004);有色金属及材料加工新技术教育部重点实验室开放基金资助项目(GXKFJ-09)

摘　　要：在氩气保护下用悬浮熔炼制备La0.7-xTixMg0.3Ni3.5(x=0.00,0.05,0.10)储氢合金,研究Ti含量对合金电极电化学性能的影响。X射线衍射(XRD)分析表明,合金相主要由LaNi5、LaMg2Ni9和La2Ni3相组成。当x=0.10时,合金中有TiNi3相产生,随着Ti含量的增加,LaNi5、LaMg2Ni9和La2Ni3相的晶胞体积减小。电化学性能测试表明,合金电极最大放电容量分别为370 mAh/g(x=0.00)、331 mAh/g(x=0.05)和252 mAh/g(x=0.10);合金电极循环伏安特性曲线氧化峰电位随着Ti含量的增加而降低,表明Ti的加入使合金电极易于发生氧化反应。The La0.7-xTixMg0.3Ni3.5（x=0.00,0.05,0.10） hydrogen storage alloys were prepared by magnetic levitation melting under Ar atmosphere,and the effects of Ti on electrochemical properties of the alloys were studied systematically.X-ray diffraction（XRD）analyses showed that the alloys are mainly composed of LaNi5,LaMg2Ni9 and La2Ni3 phases.When x=0.10,TiNi3 phase appears.The cell volumes of LaNi5,LaMg2Ni9 and La2Ni3 phase decrease with the Ti content increasing.Electrochemical investigations showed that the maximum discharge capacity of the alloy electrodes are 370 mAh/g（x=0.00）,331 mAh/g（x=0.05） and 252 mAh/g（x=0.10）,respectively.The anodic peak potential of the cyclic voltammograms curve shifts to negative with the Ti content increasing,which means that the adding of Ti make the oxidation reaction of electrodes occur more easily.

关 键 词：La-Mg-Ni 合金电极 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]