石墨烯复合及Y替代La对AB5型储氢合金电化学性能的影响  

Effects of Graphene Composite and Y Substitution for La on Electrochemical Properties of AB5-type Hydrogen Storage Alloys

作　　者：胡小龙[1] 陈炜[1] 孙志娟[1] 王强[1] HU Xiao-long;CHEN Wei;SUN Zhi-juan;WANG Qiang(Metallurgical and Material Engineering Department,Inner Mongolia Technical College of Mechanics and Electrics,Hohhot 010070,China)

机构地区：[1]内蒙古机电职业技术学院冶金与材料工程系

出　　处：《稀土》2018年第6期92-98,共7页Chinese Rare Earths

基　　金：内蒙古自治区高等学校科学研究项目(NJZY12296);内机电院院级科研课题(自然科学类)(NJDZJZR1702)

摘　　要：用熔炼法制备储氢合金LaNi3.55Mn0.4Al0.3Co0.75及Y掺杂储氢合金La0.9Y0.1Ni3.55Mn0.4Al0.3Co0.75,并用球磨法将La0.9Y0.1Ni3.55Mn0.4Al0.3Co0.75与石墨烯复合制得复合储氢材料。各样品的电化学性能测量发现,用Y部分替代La可以提高储氢合金LaNi3.55Mn0.4Al0.3Co0.75的最大放电容量、循环稳定性和高倍率放电特性。复合石墨烯后样品La0.9Y0.1Ni3.55Mn0.4Al0.3Co0.75-石墨烯的电化学性能进一步提升,其最大放电容量达到290mAh/g,60次循环后电极的容量保持率为85.7%,样品的高倍率放电性能表现出色,放电电流在900mA/g时容量保持率为80.4%是LaNi3.55Mn0.4Al0.3Co0.75样品的1.5倍。Hydrogen storage alloy La Ni3.55Mn0.4Al0.3Co0.75 and La-doped alloy La0. 9 Y0. 1 Ni3. 55 Mn0. 4 Al0. 3 Co0. 75 are prepared by melting method,and the composite hydrogen storage sample was prepared through the combination of La0. 9 Y0. 1 Ni3. 55 Mn0. 4 Al0. 3 Co0. 75 and graphene by ball milling. The electrochemical performance test showed that the substitution of Y for La could improve the maximum discharge capacity,the cycle stability and the high rate discharge characteristics of the hydrogen storage alloy La Ni3.55Mn0.4Al0.3Co0.75. The electrochemical properties of La0. 9 Y0. 1 Ni3. 55 Mn0. 4 Al0. 3 Co0. 75-graphene are further improved after composite graphene,the maximum discharge capacity is 290 m Ah/g,and the capacity retention rate of the electrode is85. 7% after 60 cycles. The high rate discharge of the sample is excellent,and the capacity retention rate of discharge current at 900 m A/g is 80. 4%,which is 1. 5 times of that of La Ni3.55Mn0.4Al0.3Co0.75 sample.

关 键 词：稀土 电化学性能 AB5型 储氢合金 石墨烯. 

分 类 号：TG139[一般工业技术—材料科学与工程]