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Pyrrole Copolymers with Enhanced Ion Diffusion Rates for Lithium Batteries

Published online by Cambridge University Press:  10 February 2011

Paul Calvert ,
Zack Gardlund ,
Trey Huntoon ,
H. K. Hall  and
Anne Padias
Paul Calvert
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, AZ, 85712.
Zack Gardlund
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, AZ, 85712.
Trey Huntoon
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, AZ, 85712.
H. K. Hall
Affiliation:
Department of Chemistry, University of Arizona, Tucson, AZ, 85712.
Anne Padias
Affiliation:
Department of Chemistry, University of Arizona, Tucson, AZ, 85712.
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Abstract

Copolymers of pyrrole with a polyether-substituted pyrrole were tested as cathodes for lithium batteries. The charge and discharge characteristics showed that anion transport was much faster in the copolymer than in polypyrrole. As a result these electrodes store and release much more charge at higher current densities but are similar to polypyrrole at low currents. Pulse and relaxation measurements of the ion diffusion showed that this difference was due to a ten-fold increase in the anion diffusion coefficient.

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References

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