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	Influence of annealing treatment on structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage alloys
	Chen Jiangping ; Luo Yongchun ; Zhang Faliang ; Yan Ruxu ; Kang Jiachen ; Chen Jianhong
	2010-05-10 ; 2010-05-10 ; OCT
关键词	A(2)B(7) type hydrogen storage alloy annealing treatment phase structure electrochemical properties METAL HYDRIDE ELECTRODES BATTERIES LAMG2NI9 CAPACITY NICKEL Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering
中文摘要	The influence of annealing temperature on the structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage electrode alloys was studied. XRD and SEM analyses show that the as-cast alloy consists of LaNi5 phase, LaMgNi4 phase, (La, Mg)Ni-3 phase and Gd2Co7 type phase. After heat treatment, the alloys consist of Gd2Co7 type phase, Ce2Ni7 type phase and (La, Mg)Ni-3 phase, and the (La, Mg)Ni-3 phase content decreases and the Ce2Ni7 type phase content increases with increasing of annealing temperature. The unit cell volumes and a-axes of PuNi3 type phase increase with increasing of annealing temperature. The electrochemical studies show that the discharge capacity and cyclic stability of the alloy electrodes have been improved markedly after annealing treatment. The discharge capacity of the alloy annealed at 1073 K is the highest (391.2 mAh/g) and then decreases with increasing of annealing temperature. However, with the increase of annealing temperature, the cyclic stability of the alloy electrode increases and the cycle life of the alloy annealed at 1173 K is the longest (C-150/C-max = 82%). In addition, both the as-cast and the annealed alloy electrodes have quite good HRD. The high rate dischargeability (HRD) of the alloy electrodes increases with increasing of annealing temperature and the alloy annealed at 1173 K is the best. The exchange current density (I-0), the limit current density (I-L) and the hydrogen diffusion coefficient (D) of the alloy electrodes are consistent with the variation of the high rate dischargeability (HRD).
语种	中文 ; 中文
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH ; SHAANXI ; C/O RARE METAL MATERIAL ENGINEERING PRESS, PO BOX 51, XIAN, SHAANXI 710016, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/21115]
专题	清华大学
推荐引用方式 GB/T 7714	Chen Jiangping,Luo Yongchun,Zhang Faliang,et al. Influence of annealing treatment on structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage alloys[J],2010, 2010, OCT.
APA	Chen Jiangping,Luo Yongchun,Zhang Faliang,Yan Ruxu,Kang Jiachen,&Chen Jianhong.(2010).Influence of annealing treatment on structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage alloys..
MLA	Chen Jiangping,et al."Influence of annealing treatment on structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage alloys".(2010).

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