| Boiling Point | 212°C |
| Melting Point | 18–23°C |
| Density | 1.485 g/cm³ |
| Color | Yellow |
| Formula Weight | 106.05 |
| Physical Form | Clear liquid |
| Chemical Name or Material | 4-Fluoro-1,3-dioxolan-2-one |
| Molecular Weight | 106.05 g/mol |
| SMILES String | FC1COC(=O)O1 |
| Total Trace Metal Impurities | ≤100 ppm H2O, ≤200 ppm acid (battery grade) |
| CAS Number | 114435-02-8 |
| Empirical Formula | C3H3FO3 |
| NACRES | NA.23 |
| UNSPSC Code | 26111700 |
| MDL Number | MFCD06247543 |
| InChI | 1S/C3H3FO3/c4-2-1-6-3(5)7-2/h2H,1H2 |
| InChI Key | SBLRHMKNNHXPHG-UHFFFAOYSA-N |
| Quality Level | 100 |
| Reference Grade | Anhydrous, battery grade, ≥99% |
| Applications | Lithium-ion battery electrolyte manufacturing (SEI-forming additive) |
Fluoroethylene Carbonate is a cyclic organic carbonate carrying a single fluorine substituent, produced by reacting fluoroacetic acid with carbon dioxide. That fluorine substitution gives it a unique ability to form a stable solid-electrolyte-interphase (SEI) layer on battery anode surfaces — a property that has made it one of the most important electrolyte additives in modern lithium-ion battery formulation.
FEC’s primary industrial application is as an electrolyte additive in lithium-ion battery manufacturing, where even small concentrations significantly improve cycle life, capacity retention, and low-temperature performance by stabilizing the SEI layer on graphite, silicon, and lithium-metal anodes. It’s compatible with a wide range of cathode chemistries, making it a versatile additive across battery-manufacturing platforms for electric vehicles and portable electronics. In research settings, it’s used to study SEI formation mechanisms and next-generation battery chemistries.
