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Effect on Performance of Composition of Li-ion carbon Anodes derived from PMAN/DVB copolymers

Published online by Cambridge University Press:  10 February 2011

Ronald A. Guidotti  and
William R. Even
Ronald A. Guidotti
Affiliation:
Sandia National Laboratories P.O. Box 5800, Albuquerque, NM 87185-0614, raguido@sandia.gov
William R. Even
Affiliation:
Sandia National Laboratories P.O. Box 969, Livermore, CA 94551
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Abstract

The effects on electrochemical performance of the nitrogen content of disordered carbons derived from polymethacryonitrile (PMAN)-divinylbenzene (DVB) copolymers were examined in galvanostatic cycling tests between 2 V and 0.01 V vs. Li/Li+ in IM LiPF6/ethylene carbonate (EC)-dimethyl carbonate (DMC). The first-cycle reversible capacities and coulombic efficiencies increased with increase in the level of nitrogen for samples prepared at 7000°C. However, the degree of fade also increased. Similar tests were performed on materials that were additionally heated at 1,000° and 1,300°C for five hours. Loss of nitrogen, oxygen, and hydrogen occurred under these conditions, with none remaining at the highest temperature in all cases but one. The pyrolysis temperature dominated the electrochemical performance for these samples, with lower reversible and irreversible capacities for the first intercalation cycle as the pyrolysis temperature was increased. Fade was reduced and coulombic efficiencies also improved with increase in temperate. The large irreversible capacities and high fade of these materials makes them unsuitable for use in Li-ion cells.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 165
Copyright
Copyright © Materials Research Society 2000

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References

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