trans-4,5-Difluoro-1,3-dioxolan-2-one (DFEC) is a fluorinated cyclic carbonate used as an electrolyte additive to enhance the stability and performance of lithium-ion and lithium-metal batteries. DFEC is known for forming a stable, LiF-rich solid electrolyte interphase (SEI), which significantly improves cycling efficiency, reduces interfacial resistance, and suppresses dendrite formation.

Its fluorinated structure provides excellent oxidative stability, making it ideal for high-voltage applications and advanced chemistries.

Battery-grade DFEC enables more robust electrolyte systems for demanding energy storage needs, including fast-charging, high-energy-density, and extended-lifetime applications.

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