Structure and Electrochemical Properties of Spinel Li4Ti5O12 Nanocomposites as Anode for Lithium-Ion Battery

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	Structure and Electrochemical Properties of Spinel Li4Ti5O12 Nanocomposites as Anode for Lithium-Ion Battery
	Sun, Xiangcheng 1; Hegde, Manu 2; Zhang, Yuefei 3; He, Min 4; Gu, Lin 4; Wang, Yongqing 5; Shu, Jie 6; Radovanovic, Pavle V.2; Cui, Bo 1
刊名	INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
	2014-04-01
卷号	9 期号:4 页码:1583-1596
关键词	Lithium-ion Battery Li4ti5o12 X-ray Diffraction Electron Microscopy Amorphous Coating Lithium Insertion/extraction
ISSN号	1452-3981
英文摘要	Nanocomposite particles of amorphous carbon-Li4Ti5O12 (C-LTO) and carbon nanotube-Li4Ti5O12 (CNT-LTO) were synthesized by solvothermal method and subsequent high-temperature calcination. X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), and selected area electron diffraction (SAED) were applied to characterize the phase structure, particle morphology, and the coating structure. XRD analysis, TEM micrographs, HR-TEM images and SAED analysis revealed that both LTO particles exhibited a well-developed spinel nanocrystal structure with average sizes between 20-70 nm. The C-LTO particles exhibited roughly spherical shape coated by an amorphous carbon layer up to 10 nm in thickness. The CNT-LTO samples showed uniform square nanocrystals with edge length around 20 nm and nanoscale graphitic layers covering the surface, revealing the carbon nanotubes interconnection networks among the particle assemblies. Electrochemical studies of lithium insertion/extraction performance are evaluated by the galvanostatic charge/discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Both LTO particles showed the superior initial discharge capacity of more than 200 mAh/g at 1/10C rate. The irreversible capacity of the C-LTO particles at more cycles was due to large polarization resulted from excessive carbon and possible residual precursors. The CNT-LTO particles show larger reversible capacity and enhanced electrochemical Li+ insertion/extraction kinetics at different cycling rates. The comparative structural and electrochemical analyses demonstrated that both nanoscale graphitic covering layers and the CNT interconnection networks increase the electronic conductivity and improve the kinetics rates of lithium insertion/extraction in the CNT-LTO particles.
语种	英语
出版者	ESG
WOS记录号	WOS:000332447600001
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/52725]
专题	中国科学院化学研究所
通讯作者	Sun, Xiangcheng
作者单位	1.Univ Waterloo, Dept Elect & Comp Engn, Waterloo, ON N2L 3G1, Canada 2.Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada 3.Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing 100022, Peoples R China 4.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 5.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China 6.Ningbo Univ, Fac Mat Sci & Chem Engn, Ningbo 315211, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Sun, Xiangcheng,Hegde, Manu,Zhang, Yuefei,et al. Structure and Electrochemical Properties of Spinel Li4Ti5O12 Nanocomposites as Anode for Lithium-Ion Battery[J]. INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,2014,9(4):1583-1596.
APA	Sun, Xiangcheng.,Hegde, Manu.,Zhang, Yuefei.,He, Min.,Gu, Lin.,...&Cui, Bo.(2014).Structure and Electrochemical Properties of Spinel Li4Ti5O12 Nanocomposites as Anode for Lithium-Ion Battery.INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,9(4),1583-1596.
MLA	Sun, Xiangcheng,et al."Structure and Electrochemical Properties of Spinel Li4Ti5O12 Nanocomposites as Anode for Lithium-Ion Battery".INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE 9.4(2014):1583-1596.