Fluoroethylene Carbonate (FEC) SEI Additive
CAS Number: 114435-02-8
Fluoroethylene carbonate (FEC) is a high-performance film-forming electrolyte additive that dramatically improves cycle life and Coulombic efficiency of silicon and silicon-oxide anodes by forming a stable, fluorine-rich SEI layer. It is also widely used in lithium metal and NMC high-voltage electrolyte formulations.
Technical Specifications
| appearance | Colorless transparent liquid |
| purity (%) | ≥99.9 |
| GC purity (%) | ≥99.9 |
| acidity (ppm) | ≤10 |
| moisture (ppm) | ≤20 |
| density (g/mL, 25°C) | 1.452–1.456 |
Applications
- Silicon/SiOx anode electrolyte additive (2–10 wt%)
- Lithium metal battery SEI formation additive
- High-voltage NMC electrolyte co-additive
- Hard carbon sodium-ion battery electrolyte
- All-solid-state lithium battery interface modifier
Key Features
- Generates a thin, elastic, fluorine-rich SEI that accommodates silicon volumetric expansion
- Reduces initial capacity loss and boosts first-cycle Coulombic efficiency on Si anodes
- Suppresses electrolyte decomposition at high voltages (>4.3V)
- Synergistic with VC and LiDFP additives for optimized electrolyte performance
Send Inquiry
More in Battery / Energy Storage Chemicals
1,3-Propane Sultone (1,3-PS) SEI Additive
1120-71-4
Acetylene Black Battery Grade (Shawinigan-Type)
1333-86-4
Adiponitrile (ADN) High-Voltage Electrolyte Additive
111-69-3
Alumina (Al2O3) Ceramic Separator Coating Powder
1344-28-1
Boehmite (AlOOH) Separator Coating Powder
1318-23-6
Carboxymethyl Cellulose (CMC) Anode Binder/Thickener
9004-32-4
Cobalt Sulfate Heptahydrate Battery Grade (CoSO4·7H2O)
10124-43-3
Conductive Carbon Black Super C45 Battery Grade
1333-86-4