Fey, G.T.K. and Weng, Z.X. and Chen, J.G. and Premkumar, T. (2003) Electroanalytical studies on sol–gel derived LiNi0.8Co0.2O2. Materials Chemistry and Physics, 82. pp. 5-15. ISSN 0254-0584

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Abstract

The electrochemical behavior of LiNi0.8Co0.2O2, synthesized by a sol–gel method with maleic acid as a chelating agent, was investigated using galvanostatic charge–discharge cycling and electrochemical impedance spectroscopy. Unimolar solutions of LiPF6 in mixed carbonate solvents such as EC:DEC, DEC:DMC, PC:DMC and EC:DEC:DMC were used as the electrolytes. The impedance response was found to be dependent on the extent of intercalation and deintercalation, although it was independent of the electrolyte composition. However, the charge–discharge behavior of the cathode material was found to be dependent on the electrolyte composition. Cells with 1M LiPF6 in EC:DEC gave the highest capacity. With this electrolyte, the first-cycle discharge capacity was 187mAhg−1. The first-cycle capacities obtained with the other electrolytes were lower, between 174 and 182 mAh g−1. The impedance parameters of the system at different levels of intercalation and deintercalation were derived using equivalent circuit models.

Item Type:	Article
Uncontrolled Keywords:	Cathode materials; Non-aqueous electrolytes; Electrochemical impedance spectroscopy; Lithium batteries
Subjects:	Lithium batteries Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	23 Mar 2012 16:51
Last Modified:	23 Mar 2012 16:51
URI:	http://cecri.csircentral.net/id/eprint/889

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