Study on high rate discharge performance and mechanism of AB(5) type hydrogen storage alloys

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	Study on high rate discharge performance and mechanism of AB(5) type hydrogen storage alloys
	J. H. Guo; D. M. Chen; Y. Jun; J. H. Zhang; G. Z. Liu; Y. Ke
	2004
发表期刊	Journal of Rare Earths
ISSN	1002-0721
卷号	22 期号:4 页码:509-513
摘要	The effects of surface treatment, particle size distribution, rare earth composition and B additive on the high rate discharge performance of hydrogen storage alloys were investigated. It is found that the activity, discharge capacity and high rate dischargeability of the alloys are improved after physical and chemical modification as a result of the increase of the surface area and formation of the electrocatalysis layers, which increase both the electrochemical reaction rate on the alloy surface and H diffusion rate in the alloy bulk. It is also found that both the over-coarse and over-fine particle size increase the contact resistance of the electrode, resulting in a decrease of discharge capacity, deterioration of high rate dischargeability and lower discharge plateau. In another word, a suitable particle size distribution can enhance the alloy activity, discharge capacity and high rate dischargeability. In addition, the high rate dischargeability is enhanced by increasing La content and decreasing Cc content of the alloy composition because of enlargement of the unit cell volume and the improvement of the surface activity. Moreover, B additive resultes in the formation of the second phase, and makes the alloys easier pulverization, which greatly improves the activity, discharge capacity and high rate dischargeability.
部门归属	chinese acad sci, inst met res, shenyang 110015, peoples r china. suppo battery co ltd, shenyang 110015, peoples r china.;guo, jh (reprint author), chinese acad sci, inst met res, shenyang 110015, peoples r china;guo_jinghong@hotmail.com
关键词	Storage Energy Technology Hydrogen Storage Alloy Discharge Capacity Activity High Rate Dischargeability Rare Earths Electrochemical Properties Particle-size
URL	查看原文
WOS记录号	WOS:000223877600016
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35364
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. H. Guo,D. M. Chen,Y. Jun,et al. Study on high rate discharge performance and mechanism of AB(5) type hydrogen storage alloys[J]. Journal of Rare Earths,2004,22(4):509-513.
APA	J. H. Guo,D. M. Chen,Y. Jun,J. H. Zhang,G. Z. Liu,&Y. Ke.(2004).Study on high rate discharge performance and mechanism of AB(5) type hydrogen storage alloys.Journal of Rare Earths,22(4),509-513.
MLA	J. H. Guo,et al."Study on high rate discharge performance and mechanism of AB(5) type hydrogen storage alloys".Journal of Rare Earths 22.4(2004):509-513.