As a final point, we briefly discuss preliminary results at 60°C. Figure shows that elevated temperature confers only moderate benefit for gel-2. Performance for gel-1, on the other hand, improves dramatically. Indeed, gel-1 becomes a viable contender to gel-2 at elevated temperature. This topic is further discussed in the SI. Briefly, the boosted capacities for gel-1 are likely due to decreased viscosity of the ILE at 60°C, along with faster kinetics and increased gel flexibility. We note that improved performance for gel-1 at 60°C is limited to lower current densities. Beyond 0.50 mA cm -2 , the capacities decay to their room temperature values. Additional experiments are needed for further elucidation.