TFEA (2,2,2-Trifluoroethyl Acetate, >99.0%) as Battery Electrolyte Co-Solvent and Additive, 5-25 g/bottle, CBESATFEA
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2,2,2-Trifluoroethyl Acetate (TFEA) is a fluorinated linear ester solvent used as a weak-solvation co-solvent or diluent in non-aqueous electrolytes for lithium-ion, lithium-metal, and wide-temperature battery systems.
Weak Solvation & Low Desolvation Energy Barrier: The terminal -CF3 group exerts a strong electron-withdrawing effect, reducing the electron density on the carbonyl oxygen. This weak ion-dipole interaction weakens the solvation sheath around Li+ or Na+ ions. The lower desolvation energy barrier accelerates charge-transfer kinetics at the electrode/electrolyte interface, enabling superior high-rate capability.
Low-Temperature Transport Kinetics: TFEA possesses very low viscosity and a low melting point (<-80°C). When blended into carbonate or ether formulations, it maintains high ionic mobility and prevents electrolyte freezing at sub-zero operating temperatures (down to -30°C to -50°C).
High Anodic Oxidation Stability: Compared to unfluorinated linear esters like ethyl acetate (EA) or methyl acetate (MA), the trifluoroethyl substitution lowers the Highest Occupied Molecular Orbital (HOMO) energy level. This suppresses oxidative decomposition at high cathode potentials (>4.5 V vs. Li/Li+) on nickel-rich or manganese-rich cathodes.
LHCE Compatibility & Contact Ion-Pair Structure: Due to its low solvating power, TFEA acts similarly to fluorinated ethers in Localized High-Concentration Electrolytes (LHCE). It lowers bulk electrolyte viscosity without invading the primary cation solvation sheath, preserving aggregate (AGG) and contact ion pair (CIP) solvation complexes that promote anion-derived inorganic SEI layers.
| Part Number |
CBESATFEA (C-BEA-TFEA) |
| CAS |
406-95-1 |
| Chemical Formula |
C4H5F3O2  |
| Appearance |
Colorless Liquid |
| Purity |
>99.0% |
| Molecular Weight | 142.08 g/mol |
| Package Size | 5 g, 10 g, and 25 g/bottle |
Notes: Please store the DFEA powder in the glovebox.
References:
- Z. Chang, et al. Design and Mechanism Study of High-Safety and Long-Life Electrolyte for High-Energy-Density Lithium-Ion Batteries, ACS Appl. Mater. Interfaces 2024, 16, 15, 18980–18990.
- Y. Gao, et al. Low-Temperature and Fast-Charging Sodium Metal Batteries Enabled by Molecular Structure Regulation of Fluorinated Solvents, Adv. Funct. Mater., 2025, 35, 2414652.