Feb, G.T. and Lu, C.Z. and Premkumar, T. and Chang, Y.C. (2005) TiO2 coating for long-cycling LiCoO2: A comparison of coating procedures. Surface & Coatings Technology, 199 (1). pp. 22-31. ISSN 0257-8972

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Abstract

The cycling properties of LiCoO2 coated with TiO2 by a sol–gel process from an alkoxide precursor and a mechano-thermal process from pre-formed nanoparticles are compared. Electron microscopic images of 1.0 wt.% TiO2-coated particles revealed that the oxide formed a compact coating over the cathode particles. XRD studies showed a general decrease in the value of the lattice parameter c upon coating, indicating that substitutional compounds might have formed on the surface during calcination. R-factor values from XRD studies and galvanostatic charge–discharge studies suggested that a coating level of 1.0 wt.% was optimal for materials with good cycling characteristics. While the sol–gel coating process enhanced cyclability 5-fold, the mechano-thermal process yielded materials that exhibited a 12-fold improvement. The enhanced cyclability is attributed to a suppression of the cycle-limiting hexagonal/monoclinic/hexagonal phase transitions accompanying the charge–discharge processes. Materials with better electrochemical characteristics could be obtained by the mechanothermally coating process than sol–gel. Furthermore, the mechano-thermal coating process is a simple, inexpensive, environmentally benign and commercially viable one for the production of high-cycling LiCoO2 cathode materials.

Item Type:	Article
Uncontrolled Keywords:	Coated cathodes; Sol– gel coating; Mechano-thermal coating; Coated LiCoO2; Nanoparticles; Lithium-ion battery
Subjects:	Lithium batteries Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	18 Jan 2012 11:54
Last Modified:	18 Jan 2012 11:54
URI:	http://cecri.csircentral.net/id/eprint/189

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