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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
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.

Type
Articles
Copyright
Copyright © Materials Research Society 2012

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