Dual Function of\nHydrogen Bond and CEI to Enhanced\nLithium-Ion Battery Performance

The stability of the commercial electrolyte is linked\nto the internal\nsolvent molecule, particularly in enhancing the stability of these\nmolecules. Hereby, we introduce a dual function strategy involving\nhydrogen bond induced solvent molecules and the in situ fabrication\ncathode–electrolyte interphase (CEI) to address this issue.\nThe additive <i>N</i>-(4-(2,5-dioxo-4-oxazolidinyl)butyl)-2,2,2-trifluoro­acetamide\n(DOTFA), with its oxazolidinyl and trifluoro­acetamide functional\nunits, establishes hydrogen bonds with the solvent, forming CEI films\non the cathode surface that enhance the antioxidation ability of the\nelectrolyte. These hydrogen bonds contribute to enhancing the high-pressure\nstructural stability of the solvent molecule. Additionally, the uniform\nand robust in situ constructed CEI films act as a shield, protecting\nthe cathode from various side reactions and enhancing interface compatibility.\nBy incorporation of the DOTFA additive in the electrolyte, lithium-ion\nbatteries with NCM811 cathodes exhibit excellent cycling performance.\nThe work highlights the significance of dual function in solvent molecules\nand provides an effective method for enhancing the antioxidation ability\nof the electrolyte.