Double-edged effects of electrolyte additive on interfacial stability in fast-charging lithium-ion batteries

Abstract

Essential, but not too much—Roles of electrolyte additive (FEC) in Li⁺ solvation structures and interfacial reactions are revealed in a high-concentration electrolyte. While excessive FEC addition can intervene in original Li⁺ solvation, compromising interfacial kinetics, minimal FEC is essential in fast-charging applications to seamlessly facilitate Li⁺ desolvation while reinforcing interfacial stability.