Fey, G.T.K. and Yang, H.Z. and Premkumar, T. and Naik, S.P. and Chiang, A.S.T. and Lee, D.C. and Lin, J.R. (2004) A simple mechano-thermal coating process for improved lithium battery cathode materials. Journal of Power Sources, 132 (1). pp. 172-180. ISSN 0378-7753

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Abstract

A simple, economical and convenient mechano-thermal coating procedure for the production of LiCoO2 with improved cycling performance is described. The coating material was pre-formed nanoparticulate fumed silica. TEM studies with a 1.0 wt.% silica-coated cathode suggested that the silica species partially diffused into the bulk of the cathode material. XRD studies showed a diminished lattice parameter c upon coating, indicating that a substitutional compound of the LiSiyCo1−yO2+0.5y type might have formed upon calcination. SEM images, R-factor values from XRD studies and electrochemical studies showed that a coating level of 1.0 wt.% gave an optimal performance in capacity and cyclability. SEM images showed that above this level, the excess silica formed spherules, which got glued to the coated cathode particles. Galvanostatic cycling studies showed that at a coating level of 1.0 wt.%, cyclability improved three and nine times for two commercial LiCoO2 samples.

Item Type:	Article
Uncontrolled Keywords:	Coated cathodes; Mechano-thermal coating; Coated LiCoO2; Fumed silica; Lithium-ion battery
Subjects:	Lithium batteries Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	28 Feb 2012 15:19
Last Modified:	28 Feb 2012 15:19
URI:	http://cecri.csircentral.net/id/eprint/976

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