Table shows σ values for each gel as a function of temperature. The value of σ for gel-1 (σGel-1) at room temperature (0.33 mS cm -1 ) is ~5-6× times lower than that expected for the unencapsulated ILE (~1.5 mS cm -1 ) and neat PYR14TFSI (~2.0 mS cm -1 ). By contrast, σ of gel-2 (σGel-2) at room temperature (1.92 mS cm -1 ) is close to that previously reported for the unencapsulated LHCE (1.6-2.4 mS cm -1 ). There are several important takeaways from Table . First, σGel-2 at room temperature is substantially higher than σGel-1 at all temperatures (ranging from ~9x higher at 0°C to ~2x higher at 80°C). The fact that σGel-2 is ~6× higher at 25°C than σGel-1 makes gel-2 a more promising candidate than gel-1 for use in room temperature pseudo-solid state Li-FeF3 batteries. Second, σGel-2 is up to 5 orders of magnitude higher than most polyethylene oxide (PEO)-based separators (typically 10 -1 to 10 -5 mS cm -1 ). Third, to the best of our knowledge, σGel-1 (0.33 and 1.18 mS cm -1 at 25 and 60°C, respectively) and σGel-2 (1.92 and 3.74 mS cm -1 at 25 and 60°C, respectively) are up to one to two orders of magnitude greater than the separators used in previous reports of solid state Li-FeF3 batteries (highs of 0.03 and 0.31 mS cm -1 at 30 and 60°C, respectively). The Arrhenius plots in Figure show that electrolyte exchange with LHCE decreases Ea by ~2×. We hypothesize that higher σ and lower Ea for gel-2, relative to gel-1, is due to the substantially lower viscosity of the LHCE (3.7-4.8 cP) relative to the IL (PYR14TFSI; 95.1 cP). Raman spectroscopy. Figure shows the complete Raman spectra of the PVDF-HFP gels before (gel-1) and after (gel-2) electrolyte exchange, with accompanying comparison to their pure components (ILE, LHCE, and PVDF-HFP). The Raman spectrum of the pure ILE standard (Figure , black trace) is nearly identical to that of gel-1 (red trace), with the exception of several peaks originating from PVDF-HFP (Figure and).