Jayaprakash, N. and Kalaiselvi, N. and Doh, C.H. (2007) Synthesis and electrochemical evaluation of carbon coated Cu6Sn5 alloy-graphite composite lithium battery anodes. Journal of Applied Electrochemistry, 37. pp. 567-573. ISSN 0021-891X

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Abstract

With a view to minimize the unavoidable large volume changes of tin based Cu6Sn5 alloy anodes, a composite Cu6Sn5/graphite anode has been prepared via. a mechanical alloying process and subsequently coated with disordered carbon through pyrolysis of PVC. Phase pure products with better crystallinity and preferred surface morphology were obtained, as evident from PXRD and SEM respectively. Upon electrochemical charge-discharge, the intermetallic Cu6Sn5 alloy-graphite composite anode was found to exhibit an enhanced initial discharge capacity of 564 mAh g–1 followed by significant capacity fade (>20%) especially after five cycles. On the other hand, carbon coated Cu6Sn5 alloy-graphite composite demonstrated promising electrochemical properties such as steady reversible capacity (~200 mAh g–1), excellent cycle performance (<5% capacity fade) and high coulombic efficiency (~98%) via. significant reduction of volume changes. The carbon coating offers buffering and conductive actions on the anode active material and thereby enhances the electrochemical behavior of carbon coated Cu6Sn5 alloy/graphite composite anode material.

Item Type:	Article
Uncontrolled Keywords:	Carbon coated Cu6Sn5 alloy-graphite composite anode; Lithium battery; Specific capacity; Coulombic efficiency
Subjects:	Lithium batteries
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	08 May 2012 08:37
Last Modified:	08 May 2012 08:37
URI:	http://cecri.csircentral.net/id/eprint/714

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