Acta Chimica Sinica ›› 2006, Vol. 64 ›› Issue (5): 423-427. Previous Articles     Next Articles

Original Articles

Mg0.9Ti0.1Ni1-xCox (x=0.05, 0.1, 0.15, 0.2)合金的合成及电化学性能研究

冯艳,焦丽芳,袁华堂*,王一菁,刘强,刘毅   

  1. (南开大学新能源材料化学研究所 天津 300071)
  • 投稿日期:2005-06-03 修回日期:2005-11-01 发布日期:2006-03-15
  • 通讯作者: 袁华堂

Preparation and Electrochemical Characteristics of Amorphous Mg0.9Ti0.1Ni1-xCox (x=0.05, 0.1, 0.15, 0.2) Alloys

FENG Yan, JIAO Li-Fang, YUAN Hua-Tang*, WANG Yi-Jing, LIU Qiang, LIU Yi   

  1. (Institute of New Energy Materials Chemistry, Nankai University, Tianjin 300071)
  • Received:2005-06-03 Revised:2005-11-01 Published:2006-03-15
  • Contact: YUAN Hua-Tang

Mg-based hydrogen storage alloys Mg0.9Ti0.1Ni1-xCox (x=0.05, 0.1, 0.15, 0.2) were prepared by means of mechanical alloying, and the structure and the electrochemical characteristics of these Mg-based electrodes were also studied. The result of X-ray diffraction and transmission electron microscope showed that the main phase of the alloys had amorphous structures, and some trace of weak Ni peaks might co-exist. The charge-discharge cycle tests indicate that these alloys have good electrochemistry activation characteristics, and the cycle performance of these alloys were better than those of MgNi alloys. Among such alloys, the discharge capacity of Mg0.9Ti0.1Ni0.8Co0.2 was the highest, up to 427.5 mAh•g-1. In the process of charge-discharge cycle test, the main reason of the electrode capacity decay is that Mg may become Mg(OH)2 on the surface of alloys. The corrosion curve test indicates that the Co addition can improve the anticorrosion performance of these alloys in the alkali solution and the cycle stability of these alloy electrodes.

Key words: Mg-based hydrogen storage alloy, cycle stability, anticorrosion performance