Solvent‐Free Electrolyte for High‐Temperature Rechargeable Lithium Metal Batteries

The formation of lithiophobic inorganic solid electrolyte interphase (SEI) on Li anode and cathode (CEI) the is beneficial for high-voltage metal batteries. However, in most liquid electrolytes, decomposition organic solvents inevitably forms components SEI CEI. In addition, often pose substantial safety risks due to their high volatility flammability. Herein, an organic-solvent-free eutectic based low-melting alkali perfluorinated-sulfonimide salts reported. exclusive anion reduction surface results inorganic, LiF-rich with capability suppress dendrite, as evidenced by plating/stripping CE 99.4% at 0.5 mA cm−2 1.0 mAh cm−2, 200-cycle lifespan full LiNi0.8Co0.15Al0.05O2 (2.0 cm−2) || (20 µm) cells 80 °C. proposed promising ultrasafe high-energy