ETFE (Ethyl 1,1,2,2-tetrafluoroethyl ether, HFE-374, >99.5%) as Battery Electrolyte Co-Solvent and Additive, 25-100 g/bottle, CBESAETFE

Ethyl 1,1,2,2-tetrafluoroethyl ether (ETFE) (CAS 512-51-6; widely designated in battery literature as HFE-374) is a specialized short-chain hydrofluoroether utilized as an advanced electrolyte co-solvent, diluent, and functional additive in lithium-ion, sodium-ion, and lithium-sulfur batteries.

The key benefits of ETFE are: (1) Enhanced Low-Temperature Performance: The combination of an extremely low melting point (~ -86 °C) and low viscosity maintains high ionic conductivity and discharge capacity in deep sub-zero environments. (2) Improved Cell Safety & Wetting: Rapid separator/electrode wetting characteristics and flame-retarding structural characteristics assist in curbing overall cell flammability risks. (3) Versatility Across Chemistries: Demonstrated efficacy not only in lithium-ion systems but also in smoothing sodium-ion electrode deposition interfaces and optimizing lithium-sulfur cycling stability

Part Number	CBESAETFE (C-BESA-ETFE)
CAS	512-51-6
Chemical Formula	C4H6F4O
Appearance	Colorless Liquid
Purity	>99.5% (Battery Grade)
Molecular Weight	146.08 g/mol
Package Size	25 g, 50 g, and 100 g/bottle

Notes: Please store the ETFE in the glovebox due to its sensitivity to humidity and oxygen. 

References: 

1. K. Qin, et al. A Coordinated-Anion-Enriched Electrolyte for Lean-Electrolyte Li–S Batteries, ACS Energy Lett. (2024) 9 (8): 3869–3876.
2. H. Lu, et al. Lithium/sulfur batteries with mixed liquid electrolytes based on ethyl 1,1,2,2-tetrafluoroethyl ether, Electrochimica Acta, 2015, 161, 55-62