Eutectic mixture of Protic Ionic Liquids as an Electrolyte for Activated Carbon-Based Supercapacitors - Physico-chimie des Matériaux et des Electrolytes pour l'Energie Laboratoire - - EA 6299 Accéder directement au contenu
Article Dans Une Revue Electrochimica Acta Année : 2015

Eutectic mixture of Protic Ionic Liquids as an Electrolyte for Activated Carbon-Based Supercapacitors

Résumé

One of the drawbacks of ionic liquids is that some of them are solid or very viscous at room temperature; this prevents their use as electrolytes in energy storage systems. One solution consists of a binary mixture of pure, solid salts with the formation of a eutectic, allowing it to be used at room temperature. This work describes, for the first time, the formulation and use of a binary mixture of protic ionic liquids (PILs) based on the same H-bond donor, pyrrolidinium cation, with nitrate ([Pyrr][NO3]) and bis(trifluoromethanesulfonyl) imide ([Pyrr][TFSI]) anions as an electrolyte for carbon-based supercapacitors. The physico-chemical and thermal properties of mixtures as a function of composition and temperature were fully investigated and related to their electrochemical behavior as an electrolyte. The electrochemical characterization of some selected optimal compositions (x[Pyrr][NO3] = 0.64, 0.72, 0.80) shows, at first, good capacitive behavior (up to 148 F g−1) at a potential voltage of 2.0 V. Moreover, above 2.0 V, anion intercalation was observed, increasing the specific capacitance up to 209 F g−1. At 2.5 V during cycling, the characteristic peak of anion intercalation/deintercalation decreases, caused by saturation of the positive electrode by anions. Finally, accelerated aging tests showed good capacity retention (> 80%) at 2.0 V during 110 hours for x[Pyrr][NO3] = 0.72, at 25 °C. According to these results, the use of eutectic PIL binary mixtures is a promising way to design adapted electrolytes according to the material electrode for energy devices at room temperature.
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Dates et versions

hal-02060892 , version 1 (07-03-2019)

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Citer

L. Timperman, A. Vigeant, M. Anouti. Eutectic mixture of Protic Ionic Liquids as an Electrolyte for Activated Carbon-Based Supercapacitors. Electrochimica Acta, 2015, 155, pp.164-173. ⟨10.1016/j.electacta.2014.12.130⟩. ⟨hal-02060892⟩

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