Microstructures and electrochemical properties of LaNi_(3.8-x)Al_x hydrogen storage alloys

作     者：王伟 陈云贵 李强 杨维才 

作者机构：China Academy of Engineering Physics College of Materials Science and EngineeringSichuan University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2013年第31卷第5期

页      面：497-501页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0803[工学-光学工程] 

主　　题：hydrogen storage alloy La5Ni19 electrochemical properties rare earths 

摘      要：The microstructttres and electrochemical properties of LaNi3.8-xAlx （x=0.0, 0.1, 0.2, 0.3 and 0.4） alloys were studied sys- tematically. The microstructures were identified by X-ray diffraction （XRD） and scanning electronic microscopy （SEM）. The main phases were not changed with the substitution of Ni by A1, but minor phases appeared when x=0.4. With A1 content increasing, the cell volume increased and the hydrogen storage capacity increased first and then decreased, and the maximum discharge capacity increased fi：om 209.4 mAh/g （x=0.0） to 285.3 mAh/g （x=0.3） and then decreased to 241.3 mAh/g （x=0.4）. Meanwhile, the exchange current density （10） increased and the diffusion coefficient （D） decreased with the addition of Al.