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The Effects of Near Surface and Bulk Microstructure on Lithium Intercalation of Disordered, “Hard” Carbons

Published online by Cambridge University Press:  10 February 2011

William R. Even ,
Lawrence W. Peng ,
Nancy Yang ,
Ronald Guidotti  and
Thomas Headley
William R. Even
Affiliation:
Sandia National Laboratories, P.O. Box 969, Livermore, CA 94551, [email protected]
Lawrence W. Peng
Affiliation:
Sandia National Laboratories, P.O. Box 969, Livermore, CA 94551, [email protected]
Nancy Yang
Affiliation:
Sandia National Laboratories, P.O. Box 969, Livermore, CA 94551, [email protected]
Ronald Guidotti
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185–0614
Thomas Headley
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185–0614
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Abstract

Disordered carbons were synthesized at 700°C from methacrylonitrile-divinylbenzene precursors. The disorder, even at the free surface, was confirmed with TAM. These powdered carbons were subjected to rapid surface heating by a pulsed infrared laser. While the bulk structure remained essentially unchanged, there was substantial surface reconstruction to a depth of 0.25μm after heating (5.9 W average power at 10Hz, 10 ns pulse width, 1064nm wavelength). The surface ordering appears similar to the bulk microstructure of carbons isothermally annealed at 2,200°C (i.e., turbostratic). Improvements were observed in first cycle irreversible loss, rate capability, and coulombic efficiencies of the reconstructed carbons, relative to the untreated carbon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 619
Copyright
Copyright © Materials Research Society 1998

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References

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