Influence of annealing treatment on structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage alloys

	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
	2006-10
发表期刊	RARE METAL MATERIALS AND ENGINEERING
ISSN	1002-185X
卷号	35 期号:10 页码:1572-1576
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).
关键词	A(2)B(7) type hydrogen storage alloy annealing treatment phase structure electrochemical properties
收录类别	SCI ; SCIE
语种	中文
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000241967800015
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/35667
专题	材料科学与工程学院材料科学与工程学院_特聘教授组
通讯作者	Chen Jiangping
作者单位	1.Lanzhou Univ Technol, Coll Mat Sci & Engn, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China 2.Tsing Hua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
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]. RARE METAL MATERIALS AND ENGINEERING,2006,35(10):1572-1576.
APA	Chen Jiangping,Luo Yongchun,Zhang Faliang,Yan Ruxu,Kang Jiachen,&Chen Jianhong.(2006).Influence of annealing treatment on structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage alloys.RARE METAL MATERIALS AND ENGINEERING,35(10),1572-1576.
MLA	Chen Jiangping,et al."Influence of annealing treatment on structure and electrochemical properties of La1.5Mg0.5Ni7.0 hydrogen storage alloys".RARE METAL MATERIALS AND ENGINEERING 35.10(2006):1572-1576.