CAS 333-36-8
BTFE is a symmetrical fluorinated ether — two trifluoroethyl groups on a single ether oxygen. It is supplied as a co-solvent or diluent for advanced battery electrolyte research. Part of the fluorinated electrolyte solvents and safety additives series.
BTFE is evaluated as a low-viscosity diluent and as a fluorinated co-solvent. The diluent role is the one it is most often bought for: in concentrated electrolytes, a fluorinated ether that does not itself coordinate the lithium salt strongly can be added to bring the viscosity down without dissolving the salt–solvent structure the formulation depends on. That approach is the subject of active research rather than a settled result, and how well it works is specific to the salt, the primary solvent and the concentration.
Whether BTFE improves anything in a given cell depends on the lithium salt system, the concentration, the electrode chemistry, the operating voltage, the temperature range, the solvent composition, the other additives and the cell design and formation protocol.
BTFE is a fluorinated compound. It is not halogen-free, and adding it does not make an electrolyte nonflammable.
Salt solvation. The diluent role depends on how weakly the ether coordinates the salt in the system being tested. This is measured, not assumed.
Dilution ratio. Viscosity, conductivity and transference behaviour move together as the ratio changes, and the useful window is narrow enough to need testing.
Interphase behaviour. Contribution to anode and cathode interphase chemistry is formulation-specific.
Volatility and temperature range. Behaviour across the intended operating and storage range is part of the evaluation.
Moisture control. Water is the impurity that matters most in electrolyte service. Handle and store under dry, inert conditions.
Lithium-metal electrolyte development and concentrated and diluted-concentrated electrolyte research are the two the material is most often bought for. It is also evaluated in lithium-ion battery electrolyte research, in high-voltage cathode systems, and at pilot-scale battery material evaluation.
Supplied for these areas. This is not a claim of suitability across every consumer, automotive or stationary-storage cell chemistry.
Molecular formula: C4H4F6O
Molecular weight: 182.06 g/mol
Chemical family: fluorinated ether
Reference values for the pure compound, not contracted limits. The lot COA is issued against the agreed specification and goes out with the quotation.
Specifications, packaging options and lot-specific analytical documentation are available upon request.
Packaging is matched to the quantity and to the moisture control the material needs; container material compatibility is confirmed before shipment. Store sealed, dry and away from heat. Handling and storage conditions are stated on the safety data sheet issued with the quotation.
Tell us the target purity, the moisture limit, the impurity-control requirements, the evaluation quantity and the scale you expect to reach, and we will come back with a specification and a lead time.
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