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

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Abstract

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.

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Acknowledgement

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

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Authors and Affiliations

  1. Department of Chemistry, Ulsan University, Ulsan, 680-749, South Korea

    Kwang Sun Ryu

  2. Ionics Devices Team, Electronics & Telecommunications Research Institute (ETRI), 161 Gajong, Yusong, Daejon, 305-700, South Korea

    Kwang Man Kim

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  1. Kwang Sun Ryu
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  2. Kwang Man Kim
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Correspondence to Kwang Sun Ryu or Kwang Man Kim.

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Ryu, K.S., Kim, K.M. Electrochemical performance of chemically synthesized oligo-indole as a positive electrode for lithium rechargeable batteries. J Appl Electrochem 38, 477–482 (2008). https://doi.org/10.1007/s10800-007-9461-7

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  • DOI: https://doi.org/10.1007/s10800-007-9461-7

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