Direct atomic-scale confirmation of three-phase storage mechanism in Li4Ti5O12 anodes for room-temperature sodium-ion batteries

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	Direct atomic-scale confirmation of three-phase storage mechanism in Li4Ti5O12 anodes for room-temperature sodium-ion batteries
	Sun, Y ; Zhao, L ; Pan, HL ; Lu, X ; Gu, L ; Hu, YS ; Li, H ; Armand, M ; Ikuhara, Y ; Chen, LQ ; Huang, XJ
刊名	NATURE COMMUNICATIONS
	2013
卷号	4
ISSN号	2041-1723
通讯作者	Gu, L (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Key Lab Renewable Energy, Beijing 100190, Peoples R China.
中文摘要	Room-temperature sodium-ion batteries attract increasing attention for large-scale energy storage applications in renewable energy and smart grid. However, the development of suitable anode materials remains a challenging issue. Here we demonstrate that the spinel Li4Ti5O12, well-known as a 'zero-strain' anode for lithium-ion batteries, can also store sodium, displaying an average storage voltage of 0.91 V. With an appropriate binder, the Li4Ti5O12 electrode delivers a reversible capacity of 155 mAh g(-1) and presents the best cyclability among all reported oxide-based anode materials. Density functional theory calculations predict a three-phase separation mechanism, 2Li(4)Ti(5)O(12) + 6Na(+) + 6e(-) <-> Li7Ti5O12 + Na6LiTi5O12, which has been confirmed through in situ synchrotron X-ray diffraction and advanced scanning transmission electron microscope imaging techniques. The three-phase separation reaction has never been seen in any insertion electrode materials for lithium-or sodium-ion batteries. Furthermore, interfacial structure is clearly resolved at an atomic scale in electrochemically sodiated Li4Ti5O12 for the first time via the advanced electron microscopy.
资助信息	'863' Project [2009AA033101]; '973' Projects [2009CB220104, 2012CB932900]; NSFC [51222210, 11234013, 11174334]; CAS [KJCX2-YW-W26]; One Hundred Talent Project of the Chinese Academy of Sciences
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/56890]
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	Sun, Y,Zhao, L,Pan, HL,et al. Direct atomic-scale confirmation of three-phase storage mechanism in Li4Ti5O12 anodes for room-temperature sodium-ion batteries[J]. NATURE COMMUNICATIONS,2013,4.
APA	Sun, Y.,Zhao, L.,Pan, HL.,Lu, X.,Gu, L.,...&Huang, XJ.(2013).Direct atomic-scale confirmation of three-phase storage mechanism in Li4Ti5O12 anodes for room-temperature sodium-ion batteries.NATURE COMMUNICATIONS,4.
MLA	Sun, Y,et al."Direct atomic-scale confirmation of three-phase storage mechanism in Li4Ti5O12 anodes for room-temperature sodium-ion batteries".NATURE COMMUNICATIONS 4(2013).