Galvanostatic, two electrode cycling using a Biologic SP300 potentiostat was performed in a CR2032 coin using the ionogel, PC, or DOL/DME systems as electrolyte. Glass fiber separators (Whatman GF/C) were used as required with 100 µL of the corresponding electrolyte being tested. 700 µm Li foils (Sigma) were used as the counter electrode with 300x times excess capacity to minimize any limitations due to SEI formation. The applied current density range was dependent on the temperature being studied. Room temperature varied between 21-23 o C. Cycling was performed between 2.5-4V for the LFP/Li cell or 0.5-3V for the LFP/LTO cell. EIS data was collected before each cycle from 1MHz to 100mHz at a 10mV amplitude. of the U.S. Department of Energy or the United States Government. While we see that all three electrolytes have similar charge transfer resistances, exchanging the ILE with PC significantly reduces the resistance of the gel. The decrease in gel resistance corresponds well the rate capability of the different cells (Figure ), with the PC system performing the best and ionogel showing the worst performance. The increase in the LFP charge transfer resistance after addition of the gel likely originates from LiCO3 species that form on the surface from the acidity of the sol. While there is an increase, it is not significant enough to affect the electrochemical performance of the PC-exchanged gel. ), when it is incorporated into the cell a significant polarization is found that significantly decreases the achievable capacity, even at very low currents. It is unclear whether this decreased capacity is related to freezing of the ILE, or inefficiency of charge transfer at the Li or LFP interface.