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935638

Sigma-Aldrich

Tris(trimethylsilyl) phosphate

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≥99.0%, anhydrous, battery grade

Synonym(s):

Phosphoric acid tris(trimethylsilyl ester), TMSP, TMSPA

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About This Item

Linear Formula:
[(CH3)3SiO]3P(O)
CAS Number:
Molecular Weight:
314.54
Beilstein:
1794624
MDL number:
UNSPSC Code:
12352005

grade

battery grade

Quality Level

description

Application: Battery manufacturing

Assay

≥99.0%

form

(colorless liquid)

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impurities

 ppm H2O≤500
≤500 ppm H2O

refractive index

n20/D 1.409 (lit.)

bp

228-229 °C/720 mmHg (lit.)
228-229 °C

mp

3-4 °C (lit.)
3-4 °C

density

0.945 g/mL at 25 °C (lit.)

application(s)

battery manufacturing

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SMILES string

C[Si](C)(C)OP(=O)(O[Si](C)(C)C)O[Si](C)(C)C

InChI

1S/C9H27O4PSi3/c1-15(2,3)11-14(10,12-16(4,5)6)13-17(7,8)9/h1-9H3

InChI key

QJMMCGKXBZVAEI-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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Danger

Hazard Statements

Hazard Classifications

Eye Irrit. 2 - Flam. Liq. 2 - Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

3 - Flammable liquids

WGK

WGK 2

Flash Point(F)

55.4 °F - closed cup

Flash Point(C)

13 °C - closed cup


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Tris(trimethylsilyl) borate as an electrolyte additive to improve the cyclability of LiMn2O4 cathode for lithium-ion battery
Liu Y, et al.
Journal of Power Sources, 221, 90-96 (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)
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)
Importance of Reduction and Oxidation Stability of High Voltage Electrolytes and Additives
Delp Samuel A, et.al
Electrochimica Acta, 498-510, 209-209 (2016)

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