Flexible solid-like electrolytes with ultrahigh conductivity and their applications in all-solid-state supercapacitors

Chih Chieh Yang, Hao Yang Lin, Amit Kumar, Bhaskar Pattanayak, Hung Yi Tsai, Tan Winie, Tseung-Yuen Tseng*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

All-solid-state supercapacitors (ASSS) with solid-state electrolytes (SSEs) can be used to overcome the liquid leakage problem in devices. However, ionic conduction in solid electrolytes is one of the barriers to further improvements in ASSS. This paper describes the fabrication of a flexible SSE composed of poly(vinylidene fluoride-co-hexafluoropropylene), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and ethylene carbonate, which demonstrates an ultrahigh conductivity of 8.52 mS cm -1 and a wide 5 V operation voltage window of -2 to +3 V. Electrodes composed of active carbon, multiwall carbon nanotubes, and polyvinylidene fluoride were used as both anode and cathode to assemble a symmetrical supercapacitor. The resultant supercapacitor exhibits a maximum power density of 3747 W kg -1 at an energy density of 7.71 W h kg -1 and a maximum energy density 17.1 W h kg -1 at a power density of 630 W kg -1 . It displays excellent cycling stability with 91.3% of the initial specific capacitance after 3000 charging/discharging cycles. This flexible SSE in this study demonstrates a high potential for use in energy storage, conversion, and wearable device applications.

Original languageEnglish
Pages (from-to)30239-30247
Number of pages9
JournalRSC Advances
Volume8
Issue number53
DOIs
StatePublished - 1 Jan 2018

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