Nanosized Li4Ti5O12/graphene hybrid materials with low polarization for high rate lithium ion batteries

doi:10.1016/j.jpowsour.2011.06.002

CORC > 金属研究所 > 中国科学院金属研究所

	Nanosized Li4Ti5O12/graphene hybrid materials with low polarization for high rate lithium ion batteries
	Shi, Ying; Wen, Lei; Li, Feng; Cheng, Hui-Ming
刊名	JOURNAL OF POWER SOURCES
	2011-10-15
卷号	196 期号:20 页码:8610-8617
关键词	Lithium titanate Graphene High rate anode materials Lithium-ion batteries
ISSN号	0378-7753
DOI	10.1016/j.jpowsour.2011.06.002
通讯作者	Li, Feng(fli@imr.ac.cn)
英文摘要	We report a simple strategy to prepare a hybrid of lithium titanate (Li4Ti5O12, LTO) nanoparticles well-dispersed on electrical conductive graphene nanosheets as an anode material for high rate lithium ion batteries. Lithium ion transport is facilitated by making pure phase Li4Ti5O12 particles in a nanosize to shorten the ion transport path. Electron transport is improved by forming a conductive graphene network throughout the insulating Li4Ti5O12 nanoparticles. The charge transfer resistance at the particle/electrolyte interface is reduced from 53.9 Omega to 36.2 Omega and the peak currents measured by a cyclic voltammogram are increased at each scan rate. The difference between charge and discharge plateau potentials becomes much smaller at all discharge rates because of lowered polarization. With 5 wt.% graphene, the hybrid materials deliver a specific capacity of 122 mAh g(-1) even at a very high charge/discharge rate of 30C and exhibit an excellent cycling performance, with the first discharge capacity of 132.2 mAh g(-1) and less than 6% discharge capacity loss over 300 cycles at 20C. The outstanding electrochemical performance and acceptable initial columbic efficiency of the nano-Li4Ti5O12/graphene hybrid with 5 wt.% graphene make it a promising anode material for high rate lithium ion batteries. (C) 2011 Elsevier B.V. All rights reserved.
资助项目	Ministry of Science and Technology of China[2009AA03Z337] ; National Science Foundation of China[50921004] ; National Science Foundation of China[50632040] ; Chinese Academy of Sciences[KJCX2-YW-231]
WOS研究方向	Electrochemistry ; Energy & Fuels
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000294739000058
资助机构	Ministry of Science and Technology of China ; National Science Foundation of China ; Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/105778]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Feng
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Shi, Ying,Wen, Lei,Li, Feng,et al. Nanosized Li4Ti5O12/graphene hybrid materials with low polarization for high rate lithium ion batteries[J]. JOURNAL OF POWER SOURCES,2011,196(20):8610-8617.
APA	Shi, Ying,Wen, Lei,Li, Feng,&Cheng, Hui-Ming.(2011).Nanosized Li4Ti5O12/graphene hybrid materials with low polarization for high rate lithium ion batteries.JOURNAL OF POWER SOURCES,196(20),8610-8617.
MLA	Shi, Ying,et al."Nanosized Li4Ti5O12/graphene hybrid materials with low polarization for high rate lithium ion batteries".JOURNAL OF POWER SOURCES 196.20(2011):8610-8617.