DFDEC {2,2-Difluoroethyl Ethyl Carbonate, >99.0%} as Battery Electrolyte Additive, 5 g/bottle, CBEADFDEC
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2,2-Difluoroethyl ethyl carbonate (commonly designated as DFDEC or as the related partially fluorinated unsymmetrical linear carbonate subclass) is a specialized organic carbonate engineered as an advanced electrolyte co-solvent and functional interphase-directing additive for high-voltage and high-safety lithium-ion and lithium-metal batteries. By pairing a conventional ethyl group with a partially fluorinated 2,2-difluoroethyl ester segment, DFDEC optimizes the balance between oxidative resistance, cathodic passivation, and fluidic transport properties.
Its functional roles in electrolyte engineering are: (1) Controlled Interphase (SEI/CEI) Passivation: Because of its tailored reduction and oxidation potentials, DFDEC undergoes early-stage electrochemical decomposition during initial cell formation. This sacrificial breakdown promotes the precipitation of a stable, inorganic-rich Solid Electrolyte Interphase (SEI) on the anode and a protective Cathode Electrolyte Interphase (CEI) rich in metal fluorides (LiF}). (2) High-Voltage Oxidative Stability: The partial fluorination of the linear carbonate architecture elevates the anodic stability ceiling, helping suppress electrolyte oxidation, gas evolution, and transition-metal dissolution when operating high-nickel layered oxide cathodes (e.g., NMC811) above $4.3\text{ V}$.Flame Retardancy & Safety Enhancement: Incorporating dense fluorine fractions into the carbonate backbone helps lower overall heat release rates and suppress vapor flammability during thermal abuse or extreme operating conditions.
The primary electrochemical domains are: (1) High-Voltage Nickel-Rich Cells: Integrated into standard carbonate master electrolytes to support long-term cycling stability in cells paired with high-nickel layered oxide cathodes (e.g., NMC811) operating at upper voltage cutoffs exceeding 4.3 V. (2) Capacity Retention and Impedance Suppression: Deployed to reduce polarization growth, mitigate gas evolution, and prevent rapid capacity fade under aggressive charging and high-temperature operating protocols.
| Part Number |
CBEADFDEC (C-BEA-DFDEC) |
| CAS |
916678-14-3 |
| Chemical Formula |
C5H8F2O3  |
| Appearance |
Colorless Liquid |
| Purity |
>99.0% |
| Molecular Weight | 154.11 g/mol |
| Package Size | 5 g/bottle |
Notes: Please store the DFDEC liquid in the dry place (glovebox is the best).
References:
- S. Tan, et al. Synergistic Anion and Solvent-Derived Interphases Enable Lithium-Ion Batteries under Extreme Conditions, Journal American Chemical Society (2024) 146 (44): 30104–30116.
- H. Q. Pham, et al. Performance Enhancement of 4.8 V Li1.2Mn0.525Ni0.175Co0.1O2 Battery Cathode Using Fluorinated Linear Carbonate as a High-Voltage Additive, J. Electrochem. Soc., 2014, 161, A2002