Suitability of ionic liquid electrolytes for room-temperature sodium-ion battery applications

The charge transfer resistances of practical sodium-ion battery electrodes in an ionic liquid (IL) electrolyte are unexpectedly low. A Na0.44MnO2-hard carbon full cell with an IL electrolyte has higher capacities (117 mA h g−1@0.1 C based on Na0.44MnO2) and greater stability (3% capacity decay after 100 cycles) than its conventional-electrolyte-based counterpart at 25 °C.