933988

1,1,2,2-Tetrafluoroethyl 2,2,2-trifluoroethyl ether

≥99.5%, anhydrous, acid <=100 ppm, battery grade

• Synonym(s): 1,1,2,2-tetrafluoro-1-(2,2,2-trifluoroethoxy)ethane, HFE-347, TFTFE
• Empirical Formula (Hill Notation): C₄H₃F₇O
• CAS Number: 406-78-0
• Molecular Weight: 200.05
• EC Number: 609-858-6
• MDL number: MFCD00236118
• UNSPSC Code: 12352100
• PubChem Substance ID: 253661640
• NACRES: NA.21

Properties

• grade: battery grade
• Quality Level: 100
• Assay: ≥99.5%
• form: liquid
• impurities: ≤100 ppm acid (HF); ≤250 ppm H₂O
• non-volatile residue (NVR): ≤10 ppm
• bp: 56 °C
• mp: -91 °C (lit.)
• density: 1.49 g/mL
• application(s): battery manufacturing
• SMILES string: FC(F)(F)COC(F)(F)C(F)F
• InChI: 1S/C4H3F7O/c5-2(6)4(10,11)12-1-3(7,8)9/h2H,1H2
• InChI key: CWIFAKBLLXGZIC-UHFFFAOYSA-N

Description

General description

1,1,2,2-Tetrafluoroethyl 2,2,2-trifluoroethyl ether (TFTFE) is a fluorinated ether that finds extensive use as an electrolyte solvent and diluent in various battery technologies. TFTFE has a low viscosity, low freezing point (-94 °C lit.), low dielectric constant (~6.7), and high electrochemical stability, making it an ideal candidate for use in lithium-ion batteries, lithium-sulfur batteries, and other battery systems. TFTFE is miscible with many polar organic solvents, including carbonates typically used in battery electrolytes. With a minimum purity level of 99% and free from acid impurities, our TFTFE is a reliable and safe solution for critical battery applications.

Application

Battery-grade 1,1,2,2-tetrafluoroethyl 2,2,2-trifluoroethyl ether (TFTFE) is a versatile co-solvent and additive for various battery systems. In lithium-metal batteries, TFTFE helps to suppress dendrites without raising the interfacial impedance. It also supports the stable cycling of NMC and lithium metal phosphate cathodes by forming a highly fluorinated interphase, which inhibits oxidation and transition metal dissolution.[1] Because of its stability and low viscosity, TFTFE is commonly added in localized high-concentration electrolytes (LHCE) as a diluent and flame-retardant.[2] In lithium-sulfur batteries, TFTFE plays a key role as both a polysulfide-restraining solvent and a film-forming agent, addressing the polysulfide shuttle (PSS) effect and improving battery performance.[3][4] Additionally, TFTFE plays a critical role in cell systems with solvate ionic liquids (SIL) as an ionic conduction-enhancing ingredient, particularly for high-rate cycle environments.[5] Our high-purity, anhydrous TFTFE is an ideal battery-grade additive for advanced battery technology.

Safety Information

• Pictograms: GHS07
• Signal Word: Warning
• Hazard Statements: H315,H319
• Precautionary Statements: P264 - P280 - P302 + P352 - P305 + P351 + P338 - P332 + P313 - P337 + P313
• Hazard Classifications: Eye Irrit. 2 - Skin Irrit. 2
• Storage Class Code: 10 - Combustible liquids
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable