Biredox ionic liquids with solid-like redox density in the liquid state for high-energy supercapacitors

E. Mourad, L. Coustan, P. Lannelongue, D. Zigah, A. Mehdi, A. Vioux, S.A. Freunberger, F. Favier, O. Fontaine, Nature Materials 16 (2016) 446–453.


Journal Article | Published | English
Author
Mourad, Eléonore; Coustan, Laura; Lannelongue, Pierre; Zigah, Dodzi; Mehdi, Ahmad; Vioux, André; Freunberger, Stefan AlexanderIST Austria ; Favier, Frédéric; Fontaine, Olivier
Abstract
Kinetics of electrochemical reactions are several orders of magnitude slower in solids than in liquids as a result of the much lower ion diffusivity. Yet, the solid state maximizes the density of redox species, which is at least two orders of magnitude lower in liquids because of solubility limitations. With regard to electrochemical energy storage devices, this leads to high-energy batteries with limited power and high-power supercapacitors with a well-known energy deficiency. For such devices the ideal system should endow the liquid state with a density of redox species close to the solid state. Here we report an approach based on biredox ionic liquids to achieve bulk-like redox density at liquid-like fast kinetics. The cation and anion of these biredox ionic liquids bear moieties that undergo very fast reversible redox reactions. As a first demonstration of their potential for high-capacity/high-rate charge storage, we used them in redox supercapacitors. These ionic liquids are able to decouple charge storage from an ion-accessible electrode surface, by storing significant charge in the pores of the electrodes, to minimize self-discharge and leakage current as a result of retaining the redox species in the pores, and to raise working voltage due to their wide electrochemical window.
Publishing Year
Date Published
2016-11-28
Journal Title
Nature Materials
Volume
16
Issue
4
Page
446-453
IST-REx-ID

Cite this

Mourad E, Coustan L, Lannelongue P, et al. Biredox ionic liquids with solid-like redox density in the liquid state for high-energy supercapacitors. Nature Materials. 2016;16(4):446-453. doi:10.1038/nmat4808
Mourad, E., Coustan, L., Lannelongue, P., Zigah, D., Mehdi, A., Vioux, A., … Fontaine, O. (2016). Biredox ionic liquids with solid-like redox density in the liquid state for high-energy supercapacitors. Nature Materials, 16(4), 446–453. https://doi.org/10.1038/nmat4808
Mourad, Eléonore, Laura Coustan, Pierre Lannelongue, Dodzi Zigah, Ahmad Mehdi, André Vioux, Stefan Alexander Freunberger, Frédéric Favier, and Olivier Fontaine. “Biredox Ionic Liquids with Solid-like Redox Density in the Liquid State for High-Energy Supercapacitors.” Nature Materials 16, no. 4 (2016): 446–53. https://doi.org/10.1038/nmat4808.
E. Mourad et al., “Biredox ionic liquids with solid-like redox density in the liquid state for high-energy supercapacitors,” Nature Materials, vol. 16, no. 4, pp. 446–453, 2016.
Mourad E, Coustan L, Lannelongue P, Zigah D, Mehdi A, Vioux A, Freunberger SA, Favier F, Fontaine O. 2016. Biredox ionic liquids with solid-like redox density in the liquid state for high-energy supercapacitors. Nature Materials. 16(4), 446–453.
Mourad, Eléonore, et al. “Biredox Ionic Liquids with Solid-like Redox Density in the Liquid State for High-Energy Supercapacitors.” Nature Materials, vol. 16, no. 4, Springer Nature, 2016, pp. 446–53, doi:10.1038/nmat4808.
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