An inorganic molten salt electrolyte-based Li–CO₂ battery with moderate working temperature and enhanced performance

Herein, a binary inorganic molten salt electrolyte based on lithium bis(fluorosulfonyl)imide (LiFSI) and potassium bis(fluorosulfonyl)imide (KFSI) is applied to Li–CO₂ batteries that can operate under 80 °C. Benefiting from the intrinsic nonvolatility, electrochemical stability, raised ionic conductivity, sufficient solubility and safety, the molten electrolyte endows the Li–CO₂ battery with a large discharge capacity of 4612 mA h g⁻¹ and superior rate capability. The introduction of the Ru@Super P carbon cathode further optimizes the discharge capacity (9503 mA h g⁻¹), overpotential (1.15 V), and rate capability.