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 journalArticle

40 Citations (Scopus)


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
Issue number22
Publication statusPublished - 2016 Jun 8



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

ASJC Scopus subject areas

  • Materials Science(all)

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