TFEE (1,2-(1,1,2,2-Tetrafluoroethoxy)ethane, BTFEE or HFE-578E, >99.5%) as Battery Electrolyte Co-Solvent and Additive, 25-100 g/bottle, CBESATFEE
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TFEE (more formally known as 1,2-bis(1,1,2,2-tetrafluoroethoxy)ethane, and commonly designated as BTFEE, HFE-578E, or HFE-458) is a specialized symmetric hydrofluoroether (HFE) engineered with a central ethylene glycol backbone flanked by fluorinated ethyl ether segments. It has emerged as a high-performance co-solvent, diluent, and functional interphase-directing additive for next-generation lithium-metal, lithium-sulfur, and high-voltage lithium-ion batteries.
Its main functional roles in electrolyte engineering are: (1) Localized High-Concentration Electrolyte (LHCE) Diluent: TFEE is widely deployed to reduce the viscosity, cost, and wetting resistance of highly concentrated salt solutions (such as LiFSI in standard ethers) without disrupting the inner coordination sheath. It expands the free-solvent volume while keeping the primary salt-solvent cluster intact. (2) Anion-Derived Interphase (SEI/CEI) Guidance: Unlike fully inert perfluorinated alkanes, TFEE's fluorinated end-groups and ether backbone actively promote anion decomposition kinetics at the electrode interface. This directs the formation of a robust, inorganic-rich solid-electrolyte interphase (SEI) and cathode-electrolyte interphase (CEI) rich in metal fluorides (LiF). (3) Enhanced Thermal Stability & Flame Retardancy: With a significantly elevated flash point (~67 °C) and high boiling point (~144 °C) compared to traditional volatile linear ethers (like DME, which has a flash point of -6 °C), TFEE heavily suppresses electrolyte volatility and mitigates thermal runaway risks in large-format cells.
| Part Number |
CBESATFEE (C-BESA-TFEE) |
| CAS |
358-39-4 |
| Chemical Formula |
C6H6F8O2  |
| Appearance |
Colorless Liquid |
| Purity |
>99.5% (Battery Grade) |
| Molecular Weight | 262.10 g/mol |
| Package Size | 25 g, 50 g, and 100 g/bottle |
Notes: Please store the TFEE in the glovebox due to its sensitivity to humidity and oxygen.
References:
- T. N. Tran, et al. Enhancing Cycling Stability of Lithium Metal Batteries by a Bifunctional Fluorinated Ether, Adv. Funct. Mater., 2024, 34, 2407012
- H. Lu, et al. Advanced perfluorinated electrolyte with synergistic effect of fluorinated solvents for high-voltage LiNi0.5Mn1.5O4/Li cell, Electrochimica Acta, 2022, 421, 140472