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