3-V Solid-State Flexible Supercapacitors with Ionic-Liquid-Based Polymer Gel Electrolyte for AC Line Filtering

Yu Jin Kang, Yongju Yoo, Woong Kim

    Research output: Contribution to journalArticlepeer-review

    86 Citations (Scopus)

    Abstract

    State-of-the-art solid-state flexible supercapacitors with sufficiently fast response speed for AC line filtering application suffer from limited energy density. One of the main causes of the low energy density is the low cell voltage (1 V), which is limited by aqueous-solution-based gel electrolytes. In this work, we demonstrate for the first time a 3-V flexible supercapacitor for AC line filtering based on an ionic-liquid-based polymer gel electrolyte and carbon nanotube electrode material. The flexible supercapacitor exhibits an areal energy density that is more than 20 times higher than that of the previously demonstrated 1-V flexible supercapacitor (0.66 vs 0.03 μWh/cm2) while maintaining excellent capacitive behavior at 120 Hz. The supercapacitor shows a maximum areal power density of 1.5 W/cm2 and a time constant of 1 ms. The improvement of the cell voltage while maintaining the fast-response capability greatly improves the potential of supercapacitors for high-frequency applications in wearable and/or portable electronics.

    Original languageEnglish
    Pages (from-to)13909-13917
    Number of pages9
    JournalACS Applied Materials and Interfaces
    Volume8
    Issue number22
    DOIs
    Publication statusPublished - 2016 Jun 8

    Bibliographical note

    Funding Information:
    This work was supported by a National Research Foundation of Korea (NRF) grant that was funded by the Korean government (NRF-2012R1A2A2A01046950).

    Publisher Copyright:
    © 2016 American Chemical Society.

    Keywords

    • AC line filter
    • carbon nanotube
    • flexible supercapacitor
    • ion gel
    • power performance

    ASJC Scopus subject areas

    • General Materials Science

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