Phase Structure and Electrochemical Properties of RE-Mg Based Composite Hydrogen Storage Alloys

【Author】

Han ShuminLiu Baozhong( Zhang ZhongZhu Xilin), Wang Xiaotie, Jing Tianfu~3(1. Department of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China; 2. Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Corporation Limited, Baotou 014030, China; (3. Key) Laboratory of Metastable Materials Science and Technotogy, Qinhuangdao O66004,China)

【Abstract】

A new type of AB_5-x%LaMg_3(x=2, 3, 4, 5, 6, 7, 8)composite hydrogen storage alloys were prepared by sintering the powder mixtures of a commercial AB_5 alloy and LaMg_3 alloy. The phase structure and electrochemical characteristics of the composite hydrogen storage alloys were also studied. It is shown that AB_(5)-x%LaMg_3(x=2, 3, 4, 5, 6, 7, 8)composites have mult; phase structure. The matrix phase has CaCu_5 structure, the second phase is LaNi_3 phase. The maximum discharge capacity, discharge capacity at low temperature and HRD of AB_5 alloy electrodes are greatly improved after the composite. The maximum discharge capacity of the composite electrodes increases from 325 mAh·g~(-1) for x=0 to 358 mAh·g~(-1) for x=5, and the HRD of the composites for x=5 at the current density of 1200 mA·g~(-1)30% of that of the alloy at 60 mA·g~(-1). The discharge capacity of AB_5-x%LaMg_3 composite alloy electrode at 233 K is up to 174 mAh·g~(-1). The improvement of the electrochemical characteristics of the composite electrodes seems to be related with formation of the LaNi_3 second phase.

【Keywords】

RE-Mg composite hydrogen storage materials; electrochemical properties; sintering; nickel/metal-hydride battery;rare earths

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