Solvent-free synthesis of an ionic liquid integrated ether-abundant polymer as a solid electrolyte for flexible electric double-layer capacitors

Ruiqi Na, Ching Wen Su, Yi Han Su, Yu Chun Chen, Yen Ming Chen, Guibin Wang, Hsisheng Teng

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This study develops a solvent-free synthesis technique for producing a poly(ethylene oxide)-co-poly(propylene oxide) copolymer cross-linked by a bisphenol-A diglycidyl ether in an ionic liquid (IL), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (i.e., EMImTFSI). The ether-abundant feature renders the polymer precursors soluble in the IL and enables the integration of the resulting polymer and IL involved in the synthesis into a solid polymer electrolyte (SPE). The SPE exhibits excellent mechanical and thermal stabilities and presents an electrochemical performance similar to liquid-state EMImTFSI (e.g., with an ionic conductivity of 1.38 × 10-3 S cm-1 at 20 °C). When incorporated into a flexible electric double-layer capacitor (EDLC), the SPE is directly synthesized on the carbon electrodes to enable full penetration of the SPE into the carbon micropores. The abundant ether functionalities facilitate the dissociation of the [EMIm]+[TFSI]- pair to improve the ultimate capacitance of the EDLC, despite the polymer network slightly impeding the ion transport across the carbon electrode. The high mechanical strength of the SPE is demonstrated by the negligible difference in the charge-storage performance when the flexible EDLC is bent in a range of 0-90°. This EDLC has superior specific energy and power (41.2 W h kg-1 and 12.3 kW kg-1, respectively) and excellent stability when operated within 0-3 V. The distinct merits of this synthesis technique are its environmentally friendly features and efficient integration of the SPE and electrodes, thus ensuring that this technique is readily applicable at industrial levels.

Original languageEnglish
Pages (from-to)19703-19713
Number of pages11
JournalJournal of Materials Chemistry A
Volume5
Issue number37
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Ionic Liquids
Solid electrolytes
Ionic liquids
Ether
Ethers
Polymers
Electrolytes
UCON 50-HB-5100
Carbon
Electrodes
Polypropylene oxides
Supercapacitor
Mechanical stability
Ionic conductivity
Polyethylene oxides
Strength of materials
Thermodynamic stability
Capacitance
Copolymers
Ions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Na, Ruiqi ; Su, Ching Wen ; Su, Yi Han ; Chen, Yu Chun ; Chen, Yen Ming ; Wang, Guibin ; Teng, Hsisheng. / Solvent-free synthesis of an ionic liquid integrated ether-abundant polymer as a solid electrolyte for flexible electric double-layer capacitors. In: Journal of Materials Chemistry A. 2017 ; Vol. 5, No. 37. pp. 19703-19713.
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Solvent-free synthesis of an ionic liquid integrated ether-abundant polymer as a solid electrolyte for flexible electric double-layer capacitors. / Na, Ruiqi; Su, Ching Wen; Su, Yi Han; Chen, Yu Chun; Chen, Yen Ming; Wang, Guibin; Teng, Hsisheng.

In: Journal of Materials Chemistry A, Vol. 5, No. 37, 01.01.2017, p. 19703-19713.

Research output: Contribution to journalArticle

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AU - Su, Ching Wen

AU - Su, Yi Han

AU - Chen, Yu Chun

AU - Chen, Yen Ming

AU - Wang, Guibin

AU - Teng, Hsisheng

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