935654

Tris(trimethylsilyl) borate

≥99.5%, battery grade

• Synonym(s): Boric acid tris(trimethylsilyl) ester, TMSB, Tris(trimethylsiloxy)borane, Tris(trimethylsiloxy)boron
• Linear Formula: [(CH₃)₃SiO]₃B
• CAS Number: 4325-85-3
• Molecular Weight: 278.38
• Beilstein: 1772733
• MDL number: MFCD00051588
• UNSPSC Code: 12352005

Properties

• grade: battery grade
• Quality Level: 100
• description: Application: Battery manufacturing
• Assay: ≥99.5%
• form: (Colorless liquid)
• greener alternative product characteristics: Design for Energy Efficiency; Learn more about the Principles of Green Chemistry.
• sustainability: Greener Alternative Product
• refractive index: n20/D 1.386 (lit.)
• bp: 186 °C (lit.); 186 °C
• mp: -35 °C
• density: 0.831 g/mL at 25 °C (lit.)
• application(s): battery manufacturing
• greener alternative category: Enabling
• SMILES string: C[Si](C)(C)OB(O[Si](C)(C)C)O[Si](C)(C)C
• InChI: 1S/C9H27BO3Si3/c1-14(2,3)11-10(12-15(4,5)6)13-16(7,8)9/h1-9H3
• InChI key: YZYKZHPNRDIPFA-UHFFFAOYSA-N

Description

General description

Tris(trimethylsilyl) borate (TMSB) is an electron-deficient organoborate compound. It is a colorless liquid that that is miscible with many organic solvents, including the linear and cyclic carbonates used in battery applications. Our battery grade TMSB is differentiated by its high purity and low trace water content to ensure consistent and reliable performance in batteries.

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for energy efficiency. Click here for more information.

Application

Tris(trimethylsilyl) borate has a wide range of applications in various industries, including battery manufacturing, where it is used as an electrolyte additive, particularly in high-voltage lithium-ion batteries. TMSB is a cathode-film-forming additive that forms a thin protective coating called a solid-electrolyte interface (SEI) on the surface of the cathode. Adding TMSB to the electrolyte formulation, even at low concentrations of 0.5 wt.%, noticeably improves capacity retention for NMC, LMO, and LMNO cathodes. TMSB also is shown to reduce the flammability of the electrolyte and improve the thermal stability of LiPF₆-based electrolytes at elevated temperatures.
TMSB also has catalytic properties, which make it useful in organic synthesis reactions and as a reagent in the manufacturing of pharmaceuticals and other chemicals.

Safety Information

• Pictograms: GHS02,GHS07
• Signal Word: Warning
• Hazard Statements: H226,H315,H319,H335
• Precautionary Statements: P210 - P233 - P240 - P241 - P303 + P361 + P353 - P305 + P351 + P338
• Hazard Classifications: Eye Irrit. 2 - Flam. Liq. 3 - Skin Irrit. 2 - STOT SE 3
• Target Organs: Respiratory system
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 3
• Flash Point(F): 105.8 °F - closed cup
• Flash Point(C): 41 °C - closed cup