Structures and properties of La-Mg-Ni system hydrogen storage alloys

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. A02; pp. 963 - 966
• Main Author: 肖方明 王英 唐仁衡 卢其云 彭能
• Format: Journal Article
• Language: English
• Published: 01.11.2007
• Subjects: 储氢合金; 微观结构; 电化学性能; 镧-镁-镍系统
• ISSN: 1003-6326

The double-roller rapid quenching technology was successfully used to prepare La-Mg-Ni system hydrogen storage alloys. The effects of magnesium content and heat-treatment process on the alloys properties were studied. When the alloy with 1.09%（mass fraction） Mg is heat treated at 900℃ for 4 h, its discharge capacity is more than 380 mA.h/g at 0.2C, and the cyclic life is beyond 500 counts at 2C. By XRD and PCI analyzing, the results show that the alloys are composed of LaNis and LaNi3 phase. The hydrogen absorption/desorption pressure of the alloy increases, so does the slope of plateau, and the plateau becomes broad first and narrow again as Mg content increases. This method is simple to be suitable for production on a large scale.