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935654

Sigma-Aldrich

Tris(trimethylsilyl) borate

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≥99.5%, battery grade

Synonym(s):

Boric acid tris(trimethylsilyl) ester, TMSB, Tris(trimethylsiloxy)borane, Tris(trimethylsiloxy)boron

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About This Item

Linear Formula:
[(CH3)3SiO]3B
CAS Number:
Molecular Weight:
278.38
Beilstein:
1772733
MDL number:
UNSPSC Code:
12352005

grade

battery grade

Quality Level

description

Application: Battery manufacturing

Assay

≥99.5%

form

(Colorless liquid)

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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

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

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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.
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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.

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Pictograms

FlameExclamation mark

Signal Word

Warning

Hazard Statements

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


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Effect of tris(trimethylsilyl)borate on the high voltage capacity retention of LiNi0.5Co0.2Mn0.3O2/graphite cells
Zuo X, et al.
Journal of Power Sources, 229, 308-312 (2013)
Tris(trimethylsilyl)borate as an electrolyte additive for improving interfacial stability of high voltage layered lithium-rich oxide cathode/carbonate-based electrolyte
Li J, et al
Journal of Power Sources, 285, 360-366 (2015)
Tris(trimethylsilyl) borate as an electrolyte additive to improve the cyclability of LiMn2O4cathode for lithium-ion battery
Liu Y, et al.
Journal of Power Sources, 221, 90-96 (2013)

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