Abstract
Three room-temperature ionic liquids (ILs), differing only in anion identity [1-ethyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate (EMI FAP), 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMI TFSI), and 1-ethyl-3-methylimidazolium tetracyanoborate (EMI TCB)], are employed to directly compare the mechanical and electrical responses of cross-linked, poly(ethylene glycol) diacrylate (PEGDA)-supported ionogel solid electrolytes. It is observed that the choice of IL influences the minimum amount of polymer required to create a non-flowing gel, but not the value of the Young’s modulus for a given weight fraction of PEGDA above the gelation point. Furthermore, the relative decrease in ionic conductivity above the gel point is also found to be IL-independent. These observations suggest that IL contributions to the character of these ionogels can be distinguished from the contributions of the supporting polymer scaffold. In addition, an extremely large ionic conductivity value (13.1 mS cm−1) is achieved at room temperature using EMI TCB at its gelation point (7.2 wt % PEGDA).
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