Enhanced electrochemical lithium storage activity of LiCrO2 by size effect

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	Enhanced electrochemical lithium storage activity of LiCrO2 by size effect
	Feng, GX ; Li, LF ; Liu, JY ; Liu, N ; Li, H ; Yang, XQ ; Huang, XJ ; Chen, LQ ; Nam, KW ; Yoon, WS
刊名	JOURNAL OF MATERIALS CHEMISTRY
	2009
卷号	19 期号:19 页码:2993
关键词	OXIDE CATHODE MATERIALS X-RAY-ABSORPTION ION BATTERIES CHROMIUM-OXIDE LOCAL-STRUCTURE MANGANESE LICOO2 CELLS DIFFRACTION BEHAVIOR
ISSN号	0959-9428
通讯作者	Li, H: Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	Cr8O21 was chemically lithiated using a lithium-biphenyl-dimethoxyethane solution. Lithiated Cr8O21 shows a structure in which as-formed LiCrO2 units are sandwiched between Cr2O3 superlattice layers. Chemically lithiated Cr8O21 shows a delithiation capacity of 200 mAh g(-1). It means that LiCrO2 units in lithiated Cr8O21 are electrochemically active. This finding is opposite to previous reports that LiCrO2 materials have very poor Li-storage capacities. Our new result implies that LiCrO2 with extremely small domain size could show enhanced reactivity. This proposal is proved unambiguously by the fact that LiCrO2 powder materials with smaller grain size (<20 nm) show much higher capacities than LiCrO2 materials with larger grain size (>50 nm). In addition, it is found that the cation mixing is more significantly in LiCrO2 materials with smaller grain size, which seems a key factor for the storage and transport of lithium in layered Cr-based materials. The cation mixing may also explain the result that the lattice parameters of LiCrO2 do not change significantly upon lithium extraction and insertion, investigated by in situ and ex situ XRD techniques.
收录类别	SCI
资助信息	Nature Scientific Foundation of China [50730005, 60621061]; U.S. Department of Energy [DEAC02-98CH10886]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/37342]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Feng, GX,Li, LF,Liu, JY,et al. Enhanced electrochemical lithium storage activity of LiCrO2 by size effect[J]. JOURNAL OF MATERIALS CHEMISTRY,2009,19(19):2993.
APA	Feng, GX.,Li, LF.,Liu, JY.,Liu, N.,Li, H.,...&Yoon, WS.(2009).Enhanced electrochemical lithium storage activity of LiCrO2 by size effect.JOURNAL OF MATERIALS CHEMISTRY,19(19),2993.
MLA	Feng, GX,et al."Enhanced electrochemical lithium storage activity of LiCrO2 by size effect".JOURNAL OF MATERIALS CHEMISTRY 19.19(2009):2993.