Doped Polydithienothiophene: A New Cathode‐Active Material

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Abstract
Films of doped polydithienothiophene, anodically synthesized on Pt or Pyrex electrodes in solution containing the monomer (dithienothiophene) and ( , as the supporting salt, are electroactive. These films can be driven repeatedly, in solution, between the doped and the undoped state releasing and storing charges. The coulombs efficiency of the redox process is ca. 100%, and the charge involved is equal to 20% of that involved in the initial electrochemical preparation of the doped polymer. Doped p‐DTT/Pt electrodes with high doping level (50%) have a value of of ca. 1V. In the discharge in solution of doped p‐DTT/Pt electrodes at constant current density up to 0V, high values of charge are recovered with respect to the stored (40–60% at −2 mA‐cm−2). All these features of doped p‐DTT are attractive and relevant to its application in battery technology. However, doped p‐DTT films preserved in solution show the disadvantage of a fast self‐discharge (18–100h). This phenomenon is due not to polymer degradation, but to an undoping process, presumably owing to an uncontrolled redox reaction involving the used electrolytic medium.

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