BTFP (1,3-Bis(1,1,2,2-tetrafluoroethoxy)propane, FDE or HFE-698E, >99.5%) as Battery Electrolyte Co-Solvent and Additive, 10-50 g/bottle, CBESABTFP

1,3-Bis(1,1,2,2-tetrafluoroethoxy)propane (BTFP) (CAS 138845-14-4; also frequently designated in literature as HFE-698E or FDE) is a specialized, long-chain partially fluorinated ether widely utilized as an advanced electrolyte co-solvent, diluent, and additive in high-performance lithium-ion, lithium-sulfur, and metal-anode batteries.

The key benefits of BTFP are: (1) Enhanced Thermal Stability & Volatility Control: Compared to shorter fluorinated ethers (like TTE/HFE-458), BTFP’s substantially higher boiling point (~ 162 °C) and elevated flash point drastically reduce vapor pressure and flammability risks during high-temperature or thermal abuse testing. (2) Suppression of the Polysulfide Shuttle: Highly valued in advanced lithium-sulfur (Li-S) configurations for locking polysulfides within the cathode matrix, maintaining high Coulombic efficiency over extended cycling. (3) Wide Thermal Operational Window: Promotes stable electrolyte performance across extreme temperature ranges—ranging from sub-zero environments to elevated operating temperatures (e.g., up to 100 °C in specialized thermal-stable cell designs).

Part Number	CBESABTFP (C-BESA-BTFP)
CAS	138845-14-4
Chemical Formula	C₇H₈F₈O₂
Appearance	Colorless Liquid
Purity	>99.5% (Battery Grade)
Molecular Weight	276.12 g/mol
Package Size	10 g, 25 g, and 50 g/bottle

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

References: 

1. D. Guo, et al. Electrolyte engineering for thermally stable Li–S batteries operating from –20 °C to 100 °C, Energy Environ. Sci. (2024) 17 (21): 8151–8161.
2. P. Lin, et al. Progress and Prospect of Electrolyte Engineering Strategies for Wide-Temperature Lithium–Sulfur Batteries, Adv. Energy Mater. 2026, 16, e71233