Expanding the Design\nFlexibility of Electrolyte Solvents\nfor Li–O<sub>2</sub> Secondary Batteries by Incorporating Fluorine\nGroups

The development of chemically stable electrolytes is\ncrucial for\nlithium–oxygen battery design. However, modifying electrolyte\nsolvents to enhance the specific properties often increases the number\nof constituent atoms per molecule, potentially reducing the chemical\nstability by providing more initiation sites for bond cleavage. This\nstudy demonstrates that introducing fluorine moieties into amide-based\nelectrolyte solvents mitigates this trade-off while maintaining lower\ncharging voltages over extended cycles. This effect was consistently\nobserved across various amide-based solvents, including diamides.\nThese findings suggest that introducing fluorine moieties can relax\nconstraints related to the number of constituent atoms, thereby increasing\nthe range of molecular designs.