Structure and Electrochemical Properties of Rapidly Quenched Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al<sub clas

Structure and Electrochemical Properties of Rapidly Quenched Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Alb clas

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作者：Xiao Tian (1) (2) Xiangdong Liu (1) Zhanquan Yao (3) Sufang Yan (1)
关键词：electrochemical properties ; hydrogen storage alloy ; microstructures ; rapid quenching
刊名：Journal of Materials Engineering and Performance
出版年：2013
出版时间：March 2013
年：2013
卷：22
期：3
页码：848-853
全文大小：676KB
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作者单位：Xiao Tian (1) (2) Xiangdong Liu (1) Zhanquan Yao (3) Sufang Yan (1) 1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot, 010051, China 2. School of Physics and Electronic Information, Inner Mongolia Normal University, Huhhot, 010022, China 3. School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot, 010018, China
ISSN：1544-1024

文摘

The as-cast Mm0.3b>Ml0.7b>Ni3.55b>Co0.75b>Mn0.4b>Al0.3b> alloy has been treated using rapid-quenching technique at different quenching speeds to improve the electrochemical hydrogen storage properties of the alloys. The morphologic and microstructural characterizations of alloys were studied using x-ray diffraction and transmission electron microscopy. It is observed that the quenched alloy is composed of two main phases, LaNi5b> and LaNi3b>, and one minor phase of La2b>Ni3b>. The microstructures of the alloys vary with the quenching speeds, as well as contain microcrystalline, nanocrystalline, and amorphous structures. The electrochemical hydrogen storage properties were measured using a battery test system. The results indicate that the discharge capacity of the alloy increases initially and then decreases with the rising quenching speeds. The quenched alloy at a speed of 15?m/s exhibits the maximum discharge capacity (388?mAh/g), which is much higher than that of the AB5b>-type rare earth-based hydrogen storage alloy reported in previous studies. However, the stability of the electrochemical cycle of the quenched alloy exhibits inverse trends compared with the discharge capacity. The best electrochemical cyclic stability of the quenched alloy can be obtained at a speed of 25?m/s.

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