Adhesive, free-standing, partially fluorinated comb copolymer electrolyte films for solid flexible supercapacitors

Seung Jae Moon, Hyo Jun Min, Chang Soo Lee, Du Ru Kang, Jong Hak Kim

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Solid-state electrolytes exhibiting high safety and flexibility have attracted global attention as an alternative to conventional fluidic and flammable liquid electrolytes for energy storage devices. Herein, we report a free-standing solid electrolyte film with high ionic conductivity, strong adhesive property, and good mechanical strength based on a partially fluorinated, microphase-separated comb copolymer consisting of superhydrophobic poly(2,2,2-trifluoroethyl methacrylate) and amphiphilic crystalline poly(ethylene glycol) behenyl ether methacrylate. The comb copolymer electrolyte film with ionic liquid (IL) exhibited a wide potential window of 2.2 V and retained its excellent flexibility up to 85 wt% IL loading. This property arises from the self-assembled microphase separation, which functions as an effective channel for ion transportation, resulting in improved ionic conductivity. The electrolyte film was applied to a solid supercapacitor with activated carbon electrodes, resulting in a high specific capacitance (37.3 F g−1), energy density (23.2 Wh kg−1), and power density (530 W kg−1), and outperformed the cells made with conventional poly(vinyl alcohol) electrolyte. Interestingly, the fabrication of supercapacitors did not require any separator, adhesive, or packaging process because of the strong self-adhesive and mechanical properties of the comb copolymer electrolyte film.

Original languageEnglish
Article number132240
JournalChemical Engineering Journal
Volume429
DOIs
Publication statusPublished - 2022 Feb 1

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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