Physical properties and solid-liquid equilibria for hexafluorophosphate-based ionic liquid ternary mixtures and their corresponding subsystems

Bouarab, Anya F.; Martins, Mónia A.R.; Stolarska, Olga; Śmiglak, Marcin; Harvey, Jean‐Philippe; Coutinho, J.; Robelin, Christian

doi:10.1016/j.molliq.2020.113742

Cited by 5 publications

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Electrical Double‐Layer Capacitors Based on a Ternary Ionic Liquid Electrolyte Operating at Low Temperature with Realistic Gravimetric and Volumetric Energy Outputs

2021

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We report on electrical double‐layer capacitors (EDLCs) performing effectively at low temperature (down to −40 °C), owing to the tuned characteristics of both the ionic liquid (IL) electrolyte and carbonaceous electrodes. The transport properties of the electrolyte have been enhanced by adding a low‐viscosity IL with the tetracyanoborate anion, [EMIm][TCB], to a mixture of [EMIm][FSI] with [EMIm][BF4], which was already successfully applied for this application. The formulated ternary electrolyte, [EMIm][FSI]0.6[BF4]0.1[TCB]0.3, remained in the liquid state until it reached the glass transition at −99 °C and displayed a relatively low viscosity and high conductivity (η=23.6 mP s and σ=14.2 mS cm−1 at 20 °C, respectively). The electrodes were made of a hierarchical SiO2‐templated carbon with well‐defined and uniform mesopores of ∼9 nm facilitating ion transport to the interconnected micropores accounted for the charge storage, whereas the high density of the electrodes promoted high volumetric energy outputs of the cells.

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