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Passive-Film Formation on Metal Substrates in IM LiPF6/EC-DMC Solutions

Published online by Cambridge University Press:  10 February 2011

Ronald A. Guidotti  and
Gerald C. Nelson
Ronald A. Guidotti
Affiliation:
Sandia National Laboratories P.O. Box 5800, Albuquerque, NM 87185–0614, [email protected]
Gerald C. Nelson
Affiliation:
Sandia National Laboratories P.O. Box 5800, Albuquerque, NM 87185–0614, [email protected]
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Abstract

The initial irreversible capacity loss in lithium-ion cells has been attributed to passive-film formation on the carbon and graphite anodes during the first intercalation. We have examined the nature of these passive films on select metal substrates. We studied film formation on Cu, 304 stainless steel, and Mo cycled in a 1M LiPF6/ethylene carbonate (EC)-dimethyl carbonate (DMC) solution (1:1 v/v) over a potential range of 3 V to below 0 V. Film formation occurs readily on each of the metals and involves both solvent and salt species. The composition, thickness, and distribution of the films depends strongly on the substrate. The redox processes that occur during film formation and the potential for Li plating are highly dependent on the substrate composition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 469
Copyright
Copyright © Materials Research Society 1998

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References

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