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Structure Characterization and Electrochemical Characteristics of Carbon Nanotube- Spinel Li4Ti5O12 Nanoparticles

Published online by Cambridge University Press:  09 August 2012

Xiangcheng Sun ,
A. Iqbal ,
I. D. Hosein ,
M. J. Yacaman ,
Z. Y. Tang ,
P. V. Radovanovic  and
B. Cui
Xiangcheng Sun
Affiliation:
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada
A. Iqbal
Affiliation:
Institute of Chemical Sciences, University of Peshawar, Pakistan
I. D. Hosein
Affiliation:
Department of Chemistry, University of Waterloo, Waterloo, Canada
M. J. Yacaman
Affiliation:
Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, USA
Z. Y. Tang
Affiliation:
National Center for Nanoscience and Technology, Beijing, China
P. V. Radovanovic
Affiliation:
Department of Chemistry, University of Waterloo, Waterloo, Canada
B. Cui
Affiliation:
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada
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Abstract

Carbon nanotube-spinel lithium titanate (CNT-Li4Ti5O12) nanoparticles have been synthesized by hydrothermal reaction and higher-temperature calcinations with LiOH·H2O and TiO2 precursors in the presence of carbon nanotubes sources. The CNT-Li4Ti5O12 nanoparticles have been characterized by X-ray diffraction (XRD), high angle annular dark field (HAADF) images, and selected area electron diffraction (SAED). The particles exhibited a spinel cubic crystal phase and homogenous size distribution, with sizes around 50-70 nm. HAADF imaging confirmed that carbon content exists on the surface of the CNT-Li4Ti5O12 nanoparticles with graphitic carbon coating of 3-5 nm thickness under 800oC in the Ar gas. The graphitic carbon phase was further confirmed with Raman spectroscopy analysis on powder samples. Electrochemical characteristics were evaluated with galvanostatic discharge/charge tests, which showed that the initial discharge capacity is 172 mA·h/g at 0.1C. The nanoscale carbon layers uniformly coated the particles, and the interconnected carbon nanotube network is responsible for the improved charge rate capability and conductivity.

Keywords

energy storagescanning transmission electron microscopy (STEM)x-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1440: Symposium O – Next-Generation Energy Storage Materials and Systems , 2012 , mrss12-1440-o09-34
Copyright
Copyright © Materials Research Society 2012

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