FSE {1,2-Bis(difluoromethylsilyl)ethane, >99.0%} as Battery Electrolyte Additive, 10-50 g/bottle, CBEAFSE
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FSE (1,2-Bis(difluoromethylsilyl)ethane or 1,2-Bis(methyldifluorosilyl)ethane, C4H10F4Si2) is an advanced, highly specialized organosilane compound evaluated as a trace-level film-forming electrolyte additive (typically around 0.5 wt%) for high-energy lithium-ion batteries—particularly those employing high-voltage or high-nickel formulations.
The key functional roles of FSE as battery electrolyte additive are shown below: (1) In-Situ Ultra-Thin SEI / CEI Formation: FSE is designed to undergo preferential electrochemical reduction and oxidation ahead of bulk organic carbonate solvents. It decomposes to construct a remarkably thin, highly stable passivating interphase on both electrode surfaces. This protective layer effectively blocks continuous electrolyte decomposition while maintaining fast Li+ desolvation and transport kinetics. (2) Silicon-Fluorine Synergistic Passivation: The dual difluoromethylsilyl centers (Si-CHF2) break down to incorporate both inorganic silicon-oxygen/silicate species and fluorine-rich components (such as LiF) into the interfacial film. This hybrid inorganic-organic architecture provides mechanical flexibility combined with high interfacial stability, suppressing impedance buildup during extended cycling. (3) High-Voltage and Elevated-Temperature Suppression: Particularly useful in high-potential environments (e.g., cells operating at ~ 4.3 V or under high-temperature stress like 60°C, FSE mitigates transition metal dissolution and prevents structural cracking or gas evolution at the electrode interfaces.
| Part Number |
CBEAFSE (C-BEA-FSE) |
| CAS |
170381-99-4 |
| Chemical Formula |
C4H10F4Si2  |
| Appearance |
Colorless Liquid |
| Purity |
>99.0% |
| Molecular Weight | 190.29 g/mol |
| Package Size | 10 g, 25 g, and 50 g/bottle |
Notes: Please try to store the FSE liquid in a dry place (glovebox or dryroom is preferred)
References:
- K. Yamagiwa, et al. Improved High-Temperature Performance and Surface Chemistry of Graphite/LiMn2O4 Li-Ion Cells by Fluorosilane-Based Electrolyte Additive, Electrochimica Acta, 2015, 160, 347-356
- X. Luo, et al. Aminoalkyldisiloxane compound as efficient high-temperature electrolyte additive for LiMn2O4/graphite batteries, Ionics, 2023, 29, 87–96