Technical Selection Guide
Why is Bis(2,2,2-trifluoroethyl) carbonate (TFEC) used in battery electrolytes?
Bis(2,2,2-trifluoroethyl) carbonate (TFEC) is a fluorinated carbonate for high-voltage and low-flammability electrolyte screening. Fluorination changes solvent polarity, oxidation behavior, and interphase products.
Why developers evaluate it
- Relevant to fluorinated carbonate systems
- Provides a distinct viscosity, polarity, or coordination profile
- Useful in controlled solvent-blend comparisons
Development considerations
- Measure viscosity, conductivity, wetting, and formation efficiency
- Measure conductivity and viscosity in the final salt concentration
- Validate formation, gas, storage, and temperature behavior in cells
How to compare it
A solvent should not be selected from boiling point or dielectric constant alone. Compare matched formulations for salt solubility, ionic conductivity, viscosity, electrode wetting, first-cycle efficiency, EIS, gas, and retention over the intended temperature range.