Journal of Applied Electrochemistry

, Volume 38, Issue 4, pp 477–482 | Cite as

Electrochemical performance of chemically synthesized oligo-indole as a positive electrode for lithium rechargeable batteries

  • Kwang Sun Ryu
  • Kwang Man Kim
Original Paper


Indole monomer was chemically polymerized to produce polyindole (PI) powder for use as a positive electrode material for lithium rechargeable batteries. Although the PI obtained was an oligomer with a low molecular weight corresponding to just 3 indole units, its electrochemical properties exhibited high d.c. electric conductivity comparable to that of the highly conducting polyaniline-LiPF6 or LiAsF6. A charge separation mechanism was also suggested to describe charge/discharge behavior of the oligo-indole (OI) protonated and/or lithiated in the Li||OI battery. Moreover, the lithium rechargeable battery adopting the OI as a positive electrode showed good cycleability with a discharge capacity of ∼55 mAh g−1, which did not decay until after more than 100 cycles.


Conducting polymer Indole Oligo-indole Lithium rechargeable battery 



This work was supported by the 2007 Research Fund of University of Ulsan (Project No. 2007-0174).


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Department of ChemistryUlsan UniversityUlsanSouth Korea
  2. 2.Ionics Devices TeamElectronics & Telecommunications Research Institute (ETRI)DaejonSouth Korea

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