DTF (2,2-Difluoroethyl Trifluoromethanesulfonate, >99.0%) as Battery Electrolyte Additive, 10-50 g/bottle, CBEADTF
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2,2-Difluoroethyl Trifluoromethanesulfonate (commonly designated as DTF or 2,2-difluoroethyl triflate) is a highly reactive trifluoromethanesulfonate ester engineered as a specialized functional additive and alkylating agent for advanced lithium-ion and lithium-metal batteries. By combining an exceptionally strong leaving group (the triflate anion) with a partially fluorinated alkyl chain, DTF serves as an interphase-directing agent designed to engineer dense, inorganic-rich protective films on reactive electrode surfaces.
Its functional roles in electrolyte engineering are: (1) Anion-Derived Interphase (SEI) Engineering: Because of its low unoccupied molecular orbital (LUMO) energy level and high reactivity, DTF undergoes preferential reductive decomposition during initial cell formation cycles. This sacrificial breakdown promotes the rapid precipitation of an inorganic-rich Solid Electrolyte Interphase (SEI) heavily enriched with lithium fluoride (LiF) and sulfur-containing inorganic species. (2) Dendrite Suppression in Lithium-Metal Systems: The compact, mechanically robust, and ionically conductive passivation layer formed by DTF mitigates localized hot spots on lithium-metal anodes, smoothing out electrodeposition profiles and suppressing dendritic growth. (3) Interfacial Resistance and Stability: By forming a stable, conformal coating on high-surface-area anodes (such as silicon or lithium metal), it prevents continuous electrolyte consumption and parasitic gassing during extended cycling
The primary electrochemical domains are: (1) Lithium-Metal Batteries (LMBs): Integrated into low-concentration or modified carbonate/ether master electrolytes to enhance Coulombic efficiency and extend the cycle life of high-energy lithium-metal full cells. (2) Silicon-Composite Anode Integration: Deployed to help accommodate the severe volumetric expansion characteristic of silicon microparticles or nanoparticles, preventing repeated SEI fracturing and electrolyte dry-up.
| Part Number |
CBEADTF (C-BEA-DTF) |
| CAS |
74427-22-8 |
| Chemical Formula |
C3H3F5O3S  |
| Appearance |
Colorless Liquid |
| Purity |
>99.0% |
| Molecular Weight | 214.11 g/mol |
| Package Size | 10 g, 25 g, and 50 g/bottle |
Notes: Please store the DTF liquid in the dry place (glovebox is the best).
References:
- Z. Cui, et al. Push–Pull Electrolyte Design Strategy Enables High-Voltage Low-Temperature Lithium Metal Batteries, Journal American Chemical Society (2024) 146 (40): 27644–27654.
- 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