Fey, G.T. and Lin, Y.Y. and Premkumar, T. (2005) Enhanced cyclability and thermal stability of LiCoO2 coated with cobalt oxides. Surface & Coatings Technology, 191 (1). pp. 68-75.

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Abstract

Improved cycling properties and thermal stability of LiCoO2 coated with cobalt oxides by a wet chemical process are described. XRD studies showed that the values of the lattice parameters, a and c, were altered by the coating, indicating that substitutional compounds might have formed on the surface upon calcination. TEM studies on 0.3-wt.% cobalt oxide-coated LiCoO2 suggested that cobalt oxides formed a uniform coating over the cathode material. SEM images, R-factor values from XRD studies and galvanostatic cycling studies indicated that a coating level of 0.3 wt.% produced optimal performance in terms of capacity and cyclability. Cyclic voltammetric curves suggested that the coating suppressed the cycle-limiting phase transitions that occur at potentials above 4.1 V vs. Li+/Li. Charge–discharge studies with a 0.3- wt.% cobalt oxide-coated LiCoO2 material showed a 12-fold improvement in cyclability. Differential scanning calorimetric data revealed the higher thermal stability of the coated cathode materials.

Item Type:	Article
Uncontrolled Keywords:	Coated cathodes; Coated LiCoO2; Cobalt oxide; Surface coating; Lithium-ion batteries
Subjects:	Lithium batteries
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	17 Jan 2012 09:30
Last Modified:	17 Jan 2012 09:30
URI:	http://cecri.csircentral.net/id/eprint/187

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