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High energy density and high working voltage of a quasi-solid-state supercapacitor with redox-active ionic liquid added gel polymer electrolyte

Abstract

To increase the energy density of quasi-solid-state supercapacitors, a redox-active gel polymer electrolyte (GPE) was prepared by evaporating the excess water in a neutral gel which consists of polyvinyl alcohol (PVA), Na2SO4 and ionic liquid (IL) N-butyl-N-methylpyrrolidinium bromide (Pyr14Br). The influence of IL Pyr14Br on the ionic conductivity of GPE was investigated. The maximum ionic conductivity of PVA-Na2SO4-Pyr14Br GPE can reach 27.1 mS cm‒1. The optimized GPE assembles with two pieces of activated carbon electrodes into a quasi-solid-state supercapacitor. The electrochemical performances of this supercapacitor were evaluated by cyclic voltammetry, galvanostatic charge/discharge, electrochemical impedance spectroscopy and self-discharge measurements. The assembled supercapacitor exhibits a high energy density of 33.0 Wh kg‒1, which is due to the wide working voltage (2.0 V) as a result of the strong solvation of Na+ cations and SO42‒ anions and the production of additional pseudocapacitive contribution from the Br‒/Br3‒ redox reaction at the electrolyte/electrode interface. This supercapacitor exhibits outstanding cyclic stability for 81.0% capacitance retention ratio after 8000 charge/discharge cycles. Moreover, this supercapacitor presents good self-discharge behavior.

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Publication details

The article was received on 20 Sep 2019, accepted on 05 Nov 2019 and first published on 06 Nov 2019


Article type: Paper
DOI: 10.1039/C9NJ04769G
New J. Chem., 2019, Accepted Manuscript

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    High energy density and high working voltage of a quasi-solid-state supercapacitor with redox-active ionic liquid added gel polymer electrolyte

    C. Geng, L. Fan, C. Wang, Y. Wang, S. Sun, Z. Song, N. Liu and J. Wu, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ04769G

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