Fey, G.T. and Chen, J.G. and Premkumar, T. (2005) Enhanced cyclability of LiCoO2 cathodes coated with alumina derived from carboxylate–alumoxanes. Journal of Applied Electrochemistry, 35 (2). pp. 177-184.

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LiCoO2 cathodes coated with Al2O3 generated from carboxylate–alumoxanes have demonstrated sustainable extended cyclability. The carboxylate–alumoxanes were prepared by reacting boehmite with acetic and substituted acetic acids. TEM images of the coated powders revealed that the coatings were compact and had an average thickness of about 20 nm. XRD data on the coated materials indicated minor changes in the values of the lattice parameters, suggesting the formation of solid solutions of the composition LiAlyCo1–yO2 on the surface during calcination. ESCA depth profiles of the constituent elements in the coated particles support this theory. R-factor values from XRD analysis and galvanostatic cycling studies suggest that a 1.0 wt. % coating formed from a (methoxyethoxy)acetate-alumoxane enhanced the cyclability by a factor of 12. The improved performance is attributed to suppression of the cycle-limiting phase transitions accompanying the charge–discharge processes. Being without environmentally hazardous organic chemicals and by-products, the coating procedure based on carboxylate–alumoxanes is a clean and benign process for industrial exploitation.

Item Type: Article
Uncontrolled Keywords: Al2O3 coating; carboxylate–alumoxanes; coated cathodes; coated LiCoO2; lithium battery
Subjects: Lead acid batteries
Lithium batteries
Electrochemical Power Sources
Depositing User: TTBD CECRI
Date Deposited: 16 Jan 2012 09:53
Last Modified: 16 Jan 2012 09:53
URI: http://cecri.csircentral.net/id/eprint/77

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