Surface modification of Sulfur cathodes with PEDOT:PSS conducting polymer in lithium-sulfur batteries

Jeongyeon Lee, Wonchang Choi

    Research output: Journal article publicationJournal articleAcademic researchpeer-review

    62 Citations (Scopus)

    Abstract

    Sulfur powder was coated with poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT:PSS) using a wet mixing process in water. The modified sulfur material was investigated for use as a cathode in lithium-sulfur (Li-S) batteries. The surface modification with the conducting polymer was identified with Fourier transform infrared (FTIR) spectra, scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM) analyses. Electrochemical evaluation revealed that surface modification with PEDOT:PSS leads to increases in initial capacity and improvements in the rate capability and cyclability of sulfur electrodes. Electrochemical impedance spectroscopy (EIS) measurements certified a decreased resistance of the PEDOT:PSS-coated sulfur electrode compared to a pure sulfur electrode, indicating that surface modification with a conducting polymer effectively enhanced the electrochemical performance of sulfur electrodes in Li-S batteries.

    Original languageEnglish
    Pages (from-to)A935-A939
    JournalJournal of the Electrochemical Society
    Volume162
    Issue number6
    DOIs
    Publication statusPublished - 2015

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Renewable Energy, Sustainability and the Environment
    • Surfaces, Coatings and Films
    • Electrochemistry
    • Materials Chemistry

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