{"product_id":"cbesatfee","title":"TFEE (1,2-(1,1,2,2-Tetrafluoroethoxy)ethane, BTFEE or HFE-578E, \u003e99.5%) as Battery Electrolyte Co-Solvent and Additive, 25-100 g\/bottle, CBESATFEE","description":"\u003cp\u003eTFEE (more formally known as 1,2-bis(1,1,2,2-tetrafluoroethoxy)ethane, and commonly designated as BTFEE, HFE-578E, or HFE-458) is a specialized symmetric hydrofluoroether (HFE) engineered with a central ethylene glycol backbone flanked by fluorinated ethyl ether segments. It has emerged as a high-performance co-solvent, diluent, and functional interphase-directing additive for next-generation lithium-metal, lithium-sulfur, and high-voltage lithium-ion batteries.\u003c\/p\u003e\n\u003cp\u003eIts main functional roles in electrolyte engineering are: (1) \u003cstrong\u003eLocalized High-Concentration Electrolyte (LHCE) Diluent\u003c\/strong\u003e: TFEE is widely deployed to reduce the viscosity, cost, and wetting resistance of highly concentrated salt solutions (such as LiFSI in standard ethers) without disrupting the inner coordination sheath. It expands the free-solvent volume while keeping the primary salt-solvent cluster intact. (2) \u003cstrong\u003eAnion-Derived Interphase (SEI\/CEI) Guidance\u003c\/strong\u003e: Unlike fully inert perfluorinated alkanes, TFEE's fluorinated end-groups and ether backbone actively promote anion decomposition kinetics at the electrode interface. This directs the formation of a robust, inorganic-rich solid-electrolyte interphase (SEI) and cathode-electrolyte interphase (CEI) rich in metal fluorides (LiF). (3) \u003cstrong\u003eEnhanced Thermal Stability \u0026amp; Flame Retardancy\u003c\/strong\u003e: With a significantly elevated flash point (~67 °C) and high boiling point (~144 °C) compared to traditional volatile linear ethers (like DME, which has a flash point of -6 °C), TFEE heavily suppresses electrolyte volatility and mitigates thermal runaway risks in large-format cells.\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"width: 100%; height: 283.6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 33.7019%; height: 35.6px;\"\u003e\u003cem\u003ePart Number\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.9772%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003eCBESATFEE (C-BESA-TFEE)\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: 33.7019%; height: 35.6px;\"\u003e\u003cem\u003eCAS\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.9772%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003e358-39-4\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 102px;\"\u003e\n\u003ctd style=\"width: 33.7019%; height: 102px;\"\u003e\u003cem\u003eChemical Formula\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.9772%; height: 102px;\"\u003e\n\u003cp\u003e\u003cspan\u003eC\u003c\/span\u003e\u003csub\u003e6\u003c\/sub\u003e\u003cspan\u003eH\u003c\/span\u003e\u003csub\u003e6\u003c\/sub\u003e\u003cspan\u003eF\u003c\/span\u003e\u003csub\u003e8\u003c\/sub\u003e\u003cspan\u003eO\u003c\/span\u003e\u003csub\u003e2\u003c\/sub\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CBESATFEE_structure_100x100.jpg?v=1789799440\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 35.6px;\"\u003e\n\u003ctd style=\"width: 33.7019%; height: 35.6px;\"\u003e\u003cem\u003eAppearance\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.9772%; 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: 33.7019%; height: 35.6px;\"\u003e\n\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003ePurity\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.9772%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003e\u0026gt;99.5% (Battery Grade)\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: 33.7019%; height: 19.6px;\"\u003e\u003cem\u003eMolecular Weight\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.9772%; height: 19.6px;\"\u003e\u003cspan\u003e262.10 g\/mol\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.7019%; height: 19.6px;\"\u003e\u003cem\u003ePackage Size\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.9772%; height: 19.6px;\"\u003e\u003cspan\u003e25 g, 50 g, and 100 g\/bottle\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e: Please store the TFEE 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:\/\/advanced.onlinelibrary.wiley.com\/doi\/full\/10.1002\/adfm.202407012\"\u003eT. N. Tran, et al. Enhancing Cycling Stability of Lithium Metal Batteries by a Bifunctional Fluorinated Ether, Adv. Funct. Mater., 2024, 34, 2407012\u003c\/a\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S001346862200634X\"\u003e\u003cspan\u003eH. Lu, et al. Advanced perfluorinated electrolyte with synergistic effect of fluorinated solvents for high-voltage LiNi0.5Mn1.5O4\/Li cell, Electrochimica Acta, 2022, 421, 140472\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"CHEMFISH","offers":[{"title":"25 g","offer_id":48400465527014,"sku":"CBESATFEE25","price":129.0,"currency_code":"USD","in_stock":true},{"title":"50 g","offer_id":48400465559782,"sku":"CBESATFEE50","price":229.0,"currency_code":"USD","in_stock":true},{"title":"100 g","offer_id":48400465592550,"sku":"CBESATFEE100","price":419.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CBESATFEE_main.jpg?v=1789799440","url":"https:\/\/echemsupplies.com\/products\/cbesatfee","provider":"EChem Supplies","version":"1.0","type":"link"}