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Merck

933988

Sigma-Aldrich

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

greener alternative

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

Sinónimos:

1,1,2,2-tetrafluoro-1-(2,2,2-trifluoroethoxy)ethane, HFE-347, TFTFE

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About This Item

Fórmula empírica (notación de Hill):
C4H3F7O
Número de CAS:
Peso molecular:
200.05
Comisión internacional de enzimas:
609-858-6
MDL number:
UNSPSC Code:
12352100
PubChem Substance ID:
NACRES:
NA.21

grade

battery grade

Quality Level

assay

≥99.5%

form

liquid

greener alternative product characteristics

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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

greener alternative category

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.
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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. Because of its stability and low viscosity, TFTFE is commonly added in localized high-concentration electrolytes (LHCE) as a diluent and flame-retardant. 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. 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. Our high-purity, anhydrous TFTFE is an ideal battery-grade additive for advanced battery technology.

pictograms

Exclamation mark

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Warning

hcodes

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2

Storage Class

10 - Combustible liquids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable


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Synthesis and electrochemical properties of partially fluorinated ether solvents for lithiumsingle bondsulfur battery electrolytes
Yue Zheng
Journal of Power Sources, 401, 271-277 (2018)
Xiulin Fan et al.
Nature nanotechnology, 13(8), 715-722 (2018-07-18)
Rechargeable Li-metal batteries using high-voltage cathodes can deliver the highest possible energy densities among all electrochemistries. However, the notorious reactivity of metallic lithium as well as the catalytic nature of high-voltage cathode materials largely prevents their practical application. Here, we

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