HFTFE (1,1,2,3,3,3-Hexafluoropropyl 2,2,2-Trifluoroethyl Ether, HFE-449, >99.5%) as Battery Electrolyte Co-Solvent and Additive, 25-100 g/bottle, CBESAHFTFE

HFTFE (1,1,2,3,3,3-hexafluoropropyl 2,2,2-trifluoroethyl ether, widely designated in battery literature as HFE-449 or THE; CAS 993-95-3) is an advanced, highly fluorinated hydrofluoroether utilized as a specialized co-solvent, diluent, and functional additive in high-energy lithium-metal and lithium-sulfur batteries.

The key benefits of HFTFE are: (1) Enhanced Lithium-Metal Interfacial Kinetics: Promotes uniform Li+ deposition, significantly suppressing dendrite propagation and boosting Coulombic efficiency during long-term stripping/plating cycles. (2) Polysulfide Suppression in Li-S Systems: When blended into ether-based electrolytes, its unique chemical structure restricts the dissolution of intermediate lithium polysulfides, effectively mitigating the destructive shuttle effect. (3) Improved Rate Capability: Low bulk viscosity and reduced interfacial impedance allow high continuous C-rates without triggering rapid polarization growth. (4) Intrinsic Non-Flammability: The high mass fraction of fluorine atoms quenches potential thermal runaway pathways, improving overall cell abuse tolerance.

Part Number	CBESAHFTFE (C-BESA-HFTFE)
CAS	993-95-3
Chemical Formula	C5H3O1F9
Appearance	Colorless Liquid
Purity	>99.5% (Battery Grade)
Molecular Weight	250.06 g/mol
Package Size	25 g, 50 g, and 100 g/bottle

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

References: 

1. L. Dong, et al. High-Polarity Fluoroalkyl Ether Electrolyte Enables Solvation-Free Li+ Transfer for High-Rate Lithium Metal Batteries, Adv. Sci., 2022, 9, 2104699
2. D. Ouyang, et al. A 1,1,2,3,3,3-hexafluoropropyl 2,2,2-trifluoroethyl ether diluted all-fluorinated electrolyte for outstanding high-voltage lithium-ion cells, Chemical Engineering Journal, 2025, 524, 169568