{"product_id":"cbestftfe","title":"TFTFE (1,1,2,2-Tetrafluoroethyl 2,2,2-trifluoroethyl ether, \u003e99.95%) as Battery Electrolyte Solvent, 50-200 g\/bottle, CBESTFTFE","description":"\u003cp\u003eTFTFE (1,1,2,2-Tetrafluoroethyl 2,2,2-trifluoroethyl ether, or HFE-347), is an asymmetric fluorinated ether used primarily as a non-solvating diluent \/ co-solvent in localized high-concentration electrolytes (LHCEs) and high-voltage lithium-metal battery systems. It combines a tetrafluoroethyl tail (-CF2CHF2) on one side of the ether oxygen and a trifluoroethyl tail (-CH2CF3) on the other, creating an asymmetric fluorination pattern that balances low viscosity, low volatility, and high anodic oxidation stability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWeak Solvation \/ Non-Solvating Diluent in LHCEs\u003c\/strong\u003e: Like its symmetric counterparts (BTFE and TTE), TFTFE serves as a key diluent for Localized High-Concentration Electrolytes (LHCE): (1) \u003cem\u003eLow Donor Power\u003c\/em\u003e: The presence of seven fluorine atoms strongly withdraws electron density from the central ether oxygen. Consequently, TFTFE has an extremely low Gutmann Donor Number (DN) and cannot dissolve lithium salts directly. (2) \u003cem\u003ePreservation of CIP\/AGG Solvation Clusters\u003c\/em\u003e: When added to a concentrated salt-in-solvent mixture (e.g., LiFSI in DME or trimethyl phosphate), TFTFE dilutes the bulk liquid to lower macroscopic viscosity without disrupting the beneficial Contact Ion Pair (CIP) and Aggregate (AGG) networks surrounding Li+ ions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSacrificial Anode Passivation (LiF-Rich SEI)\u003c\/strong\u003e: Under the strongly reductive potentials of metallic lithium or graphite anodes (\u0026lt;0.5 V vs. Li\/Li+), TFTFE undergoes sacrificial chemical\/electrochemical decomposition: It releases fluorinated species that convert the surface interphase into a dense, mechanically robust, lithium fluoride (LiF)-rich Solid Electrolyte Interphase (SEI). This high-LiF interphase suppresses continuous parasitic solvent consumption and prevents non-uniform lithium electrodeposition and dendrite growth.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWide Oxidation Window \u0026amp; Reduced Flammability\u003c\/strong\u003e: (1) \u003cem\u003eHigh Oxidation Threshold\u003c\/em\u003e: The strongly electron-withdrawing fluorinated groups lower the Highest Occupied Molecular Orbital (HOMO) energy level of TFTFE, pushing its anodic oxidation stability window beyond 4.8-5.0 V vs. Li\/Li+. This allows ether-based electrolyte formulations to operate safely with high-voltage nickel-rich cathodes (such as NMC811 or NMC955). (2) \u003cem\u003eThermal Safety\u003c\/em\u003e: TFTFE features a high fluorine-to-carbon ratio, which elevates its flash point, suppresses vapor flammability, and reduces overall heat generation during extreme thermal abuse scenarios.\u003c\/p\u003e\n\u003ctable style=\"width: 100%; height: 311.6px;\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 35.6px;\"\u003e\u003cem\u003ePart Number\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003eCBESTFTFE (C-BES-TFTFE)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.6331%;\"\u003e\u003cem\u003eCAS\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%;\"\u003e\n\u003cp\u003e\u003cspan\u003e406-78-0\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 146px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 146px;\"\u003e\u003cem\u003eChemical Formula\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 146px;\"\u003e\n\u003cp\u003eC4H3F7O\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/TFTFE_molecular_Structure_160x160.jpg?v=1764484419\"\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 35.6px;\"\u003e\u003cem\u003eAppearance\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003eColorless Liquid \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 35.6px;\"\u003e\n\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003ePurity\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026gt;99.5%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 19.6px;\"\u003e\u003cem\u003eMolecular Weight\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 19.6px;\"\u003e\u003cspan\u003e200.05 g\/mol\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 33.6331%;\"\u003e\u003cem\u003eDensity\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%;\"\u003e\u003cspan\u003e1.49 g\/mL\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 19.6px;\"\u003e\u003cem\u003eBoling Point\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 19.6px;\"\u003e\u003cspan\u003e56 °C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 19.6px;\"\u003e\u003cem\u003ePackage Size\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 19.6px;\"\u003e\u003cspan\u003e50 g, 100 g, and 200 g\/bottle\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e: Please store the TFTFE solution in the glovebox due to its sensitivity to humidity and oxygen\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eReferences\u003c\/strong\u003e: \u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cspan\u003e\u003ca href=\"https:\/\/iopscience.iop.org\/article\/10.1149\/2.0281508jes\/meta\"\u003eH. Lu, et al. Application of Partially Fluorinated Ether for Improving Performance of Lithium\/Sulfur Batteries, J. Electrochem. Soc., 2015, 162, A1460\u003c\/a\u003e.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003ca href=\"https:\/\/pubs.acs.org\/doi\/abs\/10.1021\/jacs.4c18374\"\u003eW. Yao, et al. Inner–Outer Sheath Synergistic Shielding of Polysulfides in Asymmetric Solvent-Based Electrolytes for Stable Sodium–Sulfur Batteries, J. Am. Chem. Soc.,  2025, 147, 14, 12061–12074\u003c\/a\u003e. \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"DDDC","offers":[{"title":"50 g","offer_id":48117618933990,"sku":"CBESTFTFE50","price":129.0,"currency_code":"USD","in_stock":true},{"title":"100 g","offer_id":48117618966758,"sku":"CBESTFTFE100","price":219.0,"currency_code":"USD","in_stock":true},{"title":"200 g","offer_id":48117618999526,"sku":"CBESTFTFE200","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CBESTFTFE_main.jpg?v=1785859967","url":"https:\/\/echemsupplies.com\/products\/cbestftfe","provider":"EChem Supplies","version":"1.0","type":"link"}