Ethyl fluoroacetate (EFA) is a low-viscosity, fluorinated ester explored as a functional additive in lithium-based battery electrolytes. Its molecular structure enables fluorine-containing SEI formation, which helps stabilize the electrode–electrolyte interface, particularly on lithium-metal or silicon-rich anodes. EFA can decompose in a controlled manner during initial cycles to produce LiF-rich interphases, enhancing Coulombic efficiency, reducing parasitic reactions, and suppressing dendrite growth.

Due to its volatility and reactivity, EFA is typically used in small concentrations within broader electrolyte formulations and is suitable for experimental or next-generation systems requiring improved interfacial control.

Provided at high purity, EFA is best handled under controlled conditions and is ideal for R&D teams exploring advanced additive packages for high-performance batteries.

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