HFME (Hexafluoroisopropyl Methyl Ether, HFPM, >99.5%) as Battery Electrolyte Co-Solvent and Additive, 10-50 g/bottle, CBESAHFME
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Hexafluoroisopropyl methyl ether (commonly designated as HFME or HFPM, and structurally related to HFE-356mmz) is a specialized hydrofluoroether featuring a compact methyl group paired with a strongly electron-withdrawing hexafluoroisopropyl moiety. It functions as an advanced semi-solvating co-solvent, diluent, and interphase-directing additive for next-generation lithium-metal, lithium-ion, and sodium-ion batteries.
Its main functional roles in electrolyte engineering are: (1) Localized High-Concentration Electrolyte (LHCE) Diluent: HFME expands free-solvent volume and lowers bulk liquid viscosity, facilitating rapid separator wetting and ionic transport while keeping the primary salt-solvent cluster structure intact. (2) Extreme Low-Temperature Performance: Because of its unique semi-solvating capacity, HFME-based LHCEs prevent desolvation freezing, enabling stable high-rate charge/discharge operation down to -40 °C (retaining high room-temperature capacity retention where conventional carbonate/ether blends fail). (3) Interphase Passivation (SEI / CEI Engineering): HFME undergoes preferential reductive decomposition during initial formation cycles, constructing a robust, inorganic-rich Solid Electrolyte Interphase (SEI) containing metal fluorides (LiF / NaF) that suppress dendrite nucleation on reactive lithium or sodium metal anodes. (4) Intrinsic Non-Flammability: The dense local fluorine concentration suppresses vapor-phase radical propagation, significantly raising thermal abuse thresholds compared to conventional volatile hydrocarbons.
Its main electrochemical applications are: (1) Low-Temperature & High-Rate Lithium-Metal Batteries: Deployed in demanding environments (such as cold-climate electric vehicles or high-altitude aerospace drones) requiring wide thermal operation windows from -40 °C to 60°C. (2) High-Temperature Sodium-Ion Systems: Stabilizes sodium metal anode surfaces by forming a protective fluorine-containing organic/inorganic passivation layer that mitigates exothermic decomposition.
| Part Number |
CBESAHFME (C-BESA-HFME) |
| CAS |
13171-18-1 |
| Chemical Formula |
C4H4F6O  |
| Appearance |
Colorless Liquid |
| Purity |
>99.5% (Battery Grade) |
| Molecular Weight | 182.06 g/mol |
| Package Size | 10 g, 25 g, and 50 g/bottle |
Notes: Please store the HFME in the glovebox due to its sensitivity to humidity and oxygen.
References:
- C. Wang, et al. Localized High-Concentration Electrolytes With Semi-Solvated Hexafluoroisopropyl Methyl Ether Diluent for Wide-Temperature-Range Lithium Metal Batteries, Angew Chem Int Ed, 2025, 64, e202506083
- W. Dai, et al. Localized concentrated high-concentration electrolyte enhanced stability and safety for high voltage Li-ion batteries, Electrochimica Acta, 2019, 320, 134633