Lithium-sulfur (Li-S) batteries remains an energy storage system plagued by many obstructions to their implementation including self-discharge, poor utilization of active material, and the so-called “shuttling effect” of soluble lithium polysulfide species (LiPS). Ionic liquids have been previously studied for application in Li-S cells due to their low solvating ability with LiPS species and elemental sulfur which could lead to better cycling performance. In addition, ionic liquids have great promise in both lithium-ion and beyond lithium-ion systems due to their minimal vapor pressure, high boiling points, and are virtually inflammable. Unfortunately ionic liquids alone are poor electrolyte solvents for sulfur cathodes as that they have insufficient wetting of elemental sulfur ultimately leading to lower material utilization and low specific cell capacity. In order to remedy this issue co-solvents are typically used along with an ionic liquid to increase the specific capacity of the Li-S cell. In this study we have investigated how co-solvent choice and its concentration contribute to the observed capacity of Li-S cells using either a binary or ternary solvent electrolyte systems with 1-butyl-1-methylpyrrolidinium N,N-bis(trifluoromethanesulfonyl)imide (MBPyrTFSI). The consequence of co-solvent choice and ratio will be expressed in terms of Coulombic efficiency and discharge capacity of Li-S cells, as well as the viscosity, density, and conductive properties of the electrolyte solutions.