{"product_id":"cbeabesa","title":"BESA {Bis(ethylene sulfate), or BDTD, \u003e99.5%} as Battery Electrolyte Additive, 10-50 g\/bottle, CBEABESA","description":"\u003cp\u003eBis(ethylene sulfate)—systematically named 2,2'-bi(1,3,2-dioxathiolane) 2,2,2',2'-tetraoxide (and commonly abbreviated as BES or BDTD)—is a bis-cyclic sulfate organosulfur additive used in non-aqueous electrolytes for high-voltage lithium-ion (LIBs), lithium-metal, and sodium-ion batteries. Combining two reactive 1,3,2-dioxathiolane 2,2-dioxide (ethylene sulfate) rings linked by a direct carbon-carbon bond, BES acts as a multi-functional film-former and structural cross-linker at both electrode interfaces. Its core functional roles \u0026amp; electrochemical advantages are shown below:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual Cyclic Sulfate Architecture for High Cross-Linking Density\u003c\/strong\u003e: Mono-cyclic sulfates such as ethylene sulfate (DTD) or propylene sulfate (MDTD) contain only one reactive sulfate ring per molecule. BES incorporates two distinct cyclic sulfate rings. Upon electrochemical reduction or oxidation, both rings undergo ring-opening cleavage of C–O and S–O bonds, generating a dense, 3D cross-linked interphase network. (CH2OSO2Li2).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConductive Inorganic Sulfur-Rich SEI on Anodes\u003c\/strong\u003e: BES possesses a high reduction potential (~ 1.3–1.5 V vs. Li\/Li+), reducing preferentially on graphite, silicon-carbon (Si\/C), or lithium-metal anodes before baseline carbonate solvents. It decomposes into an inorganic-rich Solid Electrolyte Interphase (SEI) composed predominantly of lithium sulfate (Li2SO4), lithium sulfite (Li2SO3), and lithium alkyl disulfates. This sulfur-rich layer provides low activation energy barriers for Li+ or Na+ ion transport, significantly reducing interfacial charge-transfer resistance (Rct) and facilitating high-rate capability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Voltage Cathode Interphase Passivation (CEI)\u003c\/strong\u003e: On nickel-rich layered oxides (NMC811, NCMA) and high-voltage manganese cathodes (\u0026gt;4.4 V vs. Li\/Li+), BES participates in sacrificial oxidation. The resulting Cathode Electrolyte Interphase (CEI) passivates surface catalytic sites, suppressing transition-metal leaching (Ni^{3+}\/Ni^{4+}, Mn^{3+}) and preventing parasitic oxidation of bulk carbonate solvents.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSuppression of Gas Evolution \u0026amp; PC Exfoliation\u003c\/strong\u003e: The rapidly formed, cross-linked sulfate interphase effectively blocks solvated cation co-intercalation into graphite, allowing propylene carbonate (PC)-rich formulations to cycle without graphite exfoliation. It suppresses gas generation (CO2, CO) and cell swelling during high-temperature storage and cycling (55–60°C).\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"width: 100%; height: 356.8px;\"\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\u003eCBEABESA (C-BEA-BESA)\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\u003cem\u003eCAS\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 35.6px;\"\u003e\n\u003cp\u003e\u003cspan\u003e1431298-10-0\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 136px;\"\u003e\n\u003ctd style=\"width: 33.6331%; height: 136px;\"\u003e\u003cem\u003eChemical Formula\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 136px;\"\u003e\n\u003cp\u003eC₄H₆O₈S₂\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CBEABESA_02_100x100.jpg?v=1786341541\" 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: 33.6331%; 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\u003eWhite Powder\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% (battery grade)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eH2O\u0026lt;200 ppm, HF\u0026lt;150 ppm\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\u003e125.4 g\/mol\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\u003eDensity\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 19.6px;\"\u003e\u003cspan\u003e1.433 g\/mL at 25 °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\u003eMelting Point\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.0072%; height: 19.6px;\"\u003e\u003cspan\u003e125.4 °C (lit.)\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\u003e10 g, 20 g, and 50 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 BESA powder in the dry place (glovebox is the best)\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\u003ca href=\"https:\/\/iopscience.iop.org\/article\/10.1149\/1945-7111\/ae764e\/meta\"\u003e\u003cspan\u003eS. Azam, et al. Ethylene Sulfate Derivatives as General-Purpose Electrolyte Additives for NMC Li-Ion, LFP Li-Ion and Na-Ion Cells, J. Electrochem. Soc., 2026, 173, 110518\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003ca href=\"https:\/\/chemistry-europe.onlinelibrary.wiley.com\/doi\/abs\/10.1002\/batt.202400477\"\u003eH. Wan, et al. Advanced Electrolyte Systems with Sultones Additives for High-Voltage Lithium Batteries, Batteries \u0026amp; Supercaps, 2024, 7, e202400477.\u003c\/a\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"CHEMFISH","offers":[{"title":"10 g","offer_id":48148332151014,"sku":"CBEABESA10","price":129.0,"currency_code":"USD","in_stock":true},{"title":"25 g","offer_id":48148332183782,"sku":"CBEABESA25","price":299.0,"currency_code":"USD","in_stock":true},{"title":"50 g","offer_id":48148332216550,"sku":"CBEABESA50","price":459.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/CBEABESA_main.jpg?v=1786341544","url":"https:\/\/echemsupplies.com\/products\/cbeabesa","provider":"EChem Supplies","version":"1.0","type":"link"}