Premkumar, T. and Manuelstephan, A. and Dhayanth, P. and Subramanian, V. and Gopukumar, S. and Renganathan, N.G. and Raghavan, M. and Muniyandi, N. (2001) Thermally oxidised graphites as anodes for Lithium-ion cells. Journal of Power Sources, 97. pp. 118-121. ISSN 0378-7753

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Abstract

Lithium intercalation and deintercalation processes occur through solid electrolyte interfaces (SEIs) on the zigzag and armchair faces of graphite. Such SEIs are formed by reaction of surface groups on the graphite with lithium on charging. The nature of this interface to a large extent determines the reversible and irreversible capacities of the graphite. We have investigated the influence of mild oxidation of samples of natural graphite and carbon nanotubes on the surface characteristics of the films formed on these materials upon lithium intercalation. The surface groups formed upon oxidation have been characterized using Fourier Transform infrared (FT-IR) spectroscopy. The reversible and irreversible capacities of the thermally oxidized samples are discussed in terms of the surface film composition as well as enhanced surface area that contributes to increased number of sites for lithium intercalation.

Item Type:	Article
Uncontrolled Keywords:	Graphite; Carbon nanotubes; Lithium intercalation; Lithium-ion cells
Subjects:	Lithium batteries Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	28 Feb 2012 15:16
Last Modified:	28 Feb 2012 15:16
URI:	http://cecri.csircentral.net/id/eprint/1131

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