FEMC (Fluoroethyl Methyl Carbonate, 99.5%) as Battery Electrolyte Additive, 25 g/bottle, CBEAFEMC
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FEMC (Fluoroethyl Methyl Carbonate) is a linear fluorinated carbonate solvent and is used as a co-solvent or additive in Lithium-Ion Battery (LIB) electrolytes to address two major concerns: safety and high-voltage stability. The incorporation of fluorine into the molecular structure imparts critical advantages for advanced battery performance:
(1) Fire Retardancy (Safety): The fluorine atoms significantly decrease the flammability of the electrolyte mixture.6 By using FEMC as a major co-solvent, the overall electrolyte has an elevated flash point and lower combustibility compared to electrolytes based purely on non-fluorinated carbonates (DMC, EMC).
(2) High-Voltage Stability (Oxidative Stability): Fluorine is highly electronegative and exerts a strong electron-withdrawing effect on the adjacent C-O bonds, which lowers the Highest Occupied Molecular Orbital (HOMO) energy level of the molecule and makes the FEMC molecule less susceptible to oxidation at the high potentials of modern cathodes.
(3) Interphase Stabilization: FEMC can act as a film-forming agent, contributing to the formation of stable protective layers on both the anode (SEI) and the cathode (CEI). This is achieved either through its own decomposition or by synergistically modifying the decomposition products of other additives like EC (Fluoroethylene Carbonate).
| Part Number |
CBEAFEMC (C-BEA-FEMC) |
| CAS |
156783-95-8 |
| Chemical Formula |
C4H5F3O3  |
| Appearance |
Colorless Liquid |
| Purity |
99.5% (Battery Grade) |
| Molecular Weight | 158.08 g/mol |
| Boiling Point | ~57-59 °C (lit.) |
| Package Size | 25 g/bottle |
Notes: Please store the FEMC solution in the glovebox due to its sensitivity to humidity and oxygen.
References:
- C. C. Su, et al. Solvation-protection-enabled high-voltage electrolyte for lithium metal batteries, Nano Energy, 2022, 92, 106720.
- D. Ouyang, et al. Optimal Blend between Carbonate Solvents and Fluoroethylene Carbonate for High-Voltage and High-Safety Li(Ni0.8Mn0.1Co0.1)O2 Lithium-Ion Cells, ACS Appl. Energy Mater. 2023, 6, 3, 2063–2071.