Microstructures and electrochemical properties of La_0.7Ce_0.3Ni_{3.75鈭?span style='font-style: italic'>x}Cu_0.75Mn_0.35Al_0.15(Fe_0.43B_0.57)_x hydrogen storage all

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• 作者：Baozhong Liu^a ; ^{bzliu@hpu.edu.cn} ; ^{b_z_liu@163.com} ; Mengjuan Hu^a ; Yanping Fan^a ; Liqiang Ji^b ; Xinlin Zhu^b ; Anming Li^a
• 关键词：Hydrogen storage alloy ; Phase structure ; Electrochemical property ; Ni&ndash ; MH batteries ; Co-free alloy
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 May, 2012
• 卷：69
• 期：Complete
• 页码：384-388
• 文件大小：501 K

摘要

Microstructures and electrochemical characteristics of La_0.7Ce_0.3Ni_3.75鈭?em>xCu_0.75Mn_0.35Al_0.15(Fe_0.43B_0.57)_x hydrogen storage alloys have been investigated. X-ray diffraction results indicate that the alloys consist of a single phase with CaCu₅-type structure, and lattice parameters c, cell volume V and c/a ratio increase with increasing x value. Maximum discharge capacity of the alloy electrodes first increases from 311.0 mAh/g (x = 0) to 316.0 mAh/g (x = 0.15), and then decreases to 311.0 mAh/g (x = 0.20). High-rate dischargeability at the discharge current density of 1200 mA/g first increases from 51.3%(x = 0) to 60.7%(x = 0.15), and then decreases to 53.6%(x = 0.20). Cycling stability first increases with increasing x from 0 to 0.10 and then decreases when x increases to 0.20, which should be ascribed to the improvement of the pulverization resistance and the deterioration of corrosion resistance.