MTFEE (Methyl 1,1,2,2-Tetrafluoroethyl Ether, HFE-254, >99.5%) as Battery Electrolyte Co-Solvent and Additive, 25-100 g/bottle, CBESAMTFEE
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Methyl 1,1,2,2-tetrafluoroethyl ether (commonly designated as MTFEE or HFE-254) is a specialized hydrofluoroether that has gained traction as a high-performance co-solvent, diluent, and functional additive for next-generation lithium-metal, lithium-sulfur, and sodium-ion liquid electrolytes. Its asymmetric fluorinated structure bridges the gap between conventional carbonate/ether solvents and highly fluorinated, non-flammable media.
Its main functional roles in electrolyte engineering are: (1) Localized High-Concentration Electrolyte (LHCE) Diluent: MTFEE acts as an "inert" diluent that does not actively coordinate with Li+ or Na+ ions. By expanding the free volume and reducing the molar concentration of coordinating solvents without precipitating the salt, it lowers overall electrolyte viscosity while retaining the high-voltage stability of a concentrated cluster. (2) Interfacial Passivation & SEI Engineering: Due to its low reduction potential relative to standard alkyl ethers, MTFEE participates in the early-stage reductive decomposition at the lithium or sodium metal anode. This yields a robust, inorganic-rich Solid Electrolyte Interphase (SEI) containing metal fluorides (LiF / NaF) that suppress dendrite propagation. (3) Flammability Suppression: The high fluorine content significantly elevates thermal resistance and lowers the flash point risk, mitigating catastrophic thermal runaway in abusive overcharge or short-circuit scenarios.
| Part Number |
CBESAHTFEE (C-BESA-HTFEE) |
| CAS |
425-88-7 |
| Chemical Formula |
C3H4F4O  |
| Appearance |
Colorless Liquid |
| Purity |
>99.5% (Battery Grade) |
| Molecular Weight | 132.06 g/mol |
| Package Size | 25 g, 50 g, and 100 g/bottle |
Notes: Please store the MTFEE in the glovebox due to its sensitivity to humidity and oxygen.
References:
- J. B. Park, et al. Designing bifunctional cosolvent-based electrolyte to optimize anion-cation associations for a stable electrode-electrolyte interphase in high-nickel li-metal batteries, Chemical Engineering Journal, 2025, 506, 160012
- Y. Han, et al. High-voltage ether-based electrolytes for lithium metal batteries via synergy between the solvent and additive, Journal of Energy Storage, 2024, 95, 112346