Ether-Functionalized Sulfonium Ionic Liquid and Its Binary Mixtures with Acetonitrile as Electrolyte for Electrochemical Double Layer Capacitors: A Molecular Dynamics Study.

Ether-functionalized sulfonium ionic liquids have been investigated as promising electrolytes in electrochemical storage energy devices due to their wide electrochemical window, high ionic conductivity, and low viscosity. In spite of that, the viscosity of neat ionic liquids is still high for supercapacitor applications. Here, we have used atomistic molecular dynamics simulations to describe transport properties, structure, and supercapacitor performance of (2-methoxyethyl)ethylmethylsulfonium bis(trifluoromethanesulfonyl)imide [S][NTf] and its mixtures with acetonitrile (ACN).