Effect of CoO Addition on Electrochemical Properties of La0.7Mg0.3 （Ni0. 85 Co0. 15 ） 3.5 Hydrogen- Storage Alloy  

作　　者：Dong Guixia Du Jun Zhu Lei Wu Borong 

机构地区：[1]Center for Energy Materials and Technology,General Research Institute for Non-Ferrous Metals, Beijing 100088, China [2]School of Material Science and Technology, Tianjin University of Technology, Tianjin 300191, China

出　　处：《Journal of Rare Earths》2006年第4期478-478,共1页稀土学报（英文版）

摘　　要：In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electrochemical properties of La0.7Mg0.3（Ni0.85 Co0.15）3.5 alloy, which is used as an electrode material was studied. When the addition of CoO is 5 %, both the discharge capacity at high-, low- and room-tem- perature and charge-discharge cycling stability at room temperature can be significantly improved. Electro- chemical measurements and X-ray diffraction （XRD） analyses suggest that CoO improves the electrochemical properties of the La0.7Mg0.3（Ni0.85Co0.15）3.5 alloy by promoting the electrochemical reaction of another phase in the alloy and by self electrochemical reversible reaction occurring during the charge-discharge process.In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electrochemical properties of La0.7Mg0.3（Ni0.85 Co0.15）3.5 alloy, which is used as an electrode material was studied. When the addition of CoO is 5 %, both the discharge capacity at high-, low- and room-tem- perature and charge-discharge cycling stability at room temperature can be significantly improved. Electro- chemical measurements and X-ray diffraction （XRD） analyses suggest that CoO improves the electrochemical properties of the La0.7Mg0.3（Ni0.85Co0.15）3.5 alloy by promoting the electrochemical reaction of another phase in the alloy and by self electrochemical reversible reaction occurring during the charge-discharge process.

关 键 词：COO hydrogen-storage alloy electrochemical property rare earths 

分 类 号：TG139.7[一般工业技术—材料科学与工程]