Nathiya, K. and Bhuvaneswari, D. and Gangulibabu, . and Nirmala, D. and Kalaiselvi, N. (2012) Li3MxV22x(PO4)3/C (M=Fe, Co) composite cathodes with extended solubility limit and improved electrochemical behavior. RSC Advances, 2. pp. 6885-6889. ISSN ESSN 2046-2069

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Abstract

A first attempt has been made to prepare Li3MxV22x(PO4)3/C (M=Fe, Co) composite solutions by adopting a novel oxalic dihyrazide assisted combustion (ODHAC) method. The pillaring effect of Fe in Li3FexV22x(PO4)3/C and the possible electrochemical activity of the Co3+/4+ redox couple of Li3CoxV22x(PO4)3/C at a 4.8 V limit increases the structural and cycling stability of the native Li3V2(PO4)3/C cathode respectively, thereby ultimately improving the electrochemical behaviour of Li3MxV22x(PO4)3/C solid solutions. An extended solubility limit of x = 0.10 for Fe dopant has been achieved for the first time through the present study against the reported value of x = 0.05 in Li3FexV22x(PO4)3/C compounds. The study demonstrates the suitability of the ODHAC synthesis approach in preparing a wide variety of phase pure Li3MxV22x(PO4)3/C cathodes. Further, the superiority of Li3Co0.10V1.90(PO4)3/C in exhibiting the highest capacity (178 mAh g21) and negligible fade (4%) and the demonstrated cyclability under the influence of 10 C rate has been understood as a function of the synergistic effect of the ODHAC synthesis method and the optimum concentration of Co dopant chosen for the study

Item Type:	Article
Uncontrolled Keywords:	Lithium batteries; cathode
Subjects:	Lithium batteries Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	Dr. N Meyyappan
Date Deposited:	02 Jan 2015 06:00
Last Modified:	02 Jan 2015 06:00
URI:	http://cecri.csircentral.net/id/eprint/3108

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