TMSP (Tris(trimethylsilyl) Phosphate, 99.9%) as Battery Electrolyte Additive, 25 g/bottle, CBEATMSP

TMSP additives perform a dual-functional role in the battery cell by acting as both an acid scavenger and an interphase-forming agent. TMSP additives help form stable protective layers on both electrodes.

(1) Cathode Electrolyte Interphase (CEI): TMSP is often preferentially oxidized at the high potential of the cathode surface (especially >4.3 V), forming a thin, stable Si- and P-rich protective film. This CEI acts as a barrier, suppressing the oxidative decomposition of the main carbonate solvents and reducing impedance buildup, which is crucial for high voltage cycling stability. 

(2) Solid Electrolyte Interphase (SEI): Research shows that TMSP can also contribute to forming a more stable and less resistive SEI on the graphite anode, particularly at elevated temperatures. This stabilizes the anode and reduces resistance to lithium-ion transport.

Part Number	CBEATMSP (C-BEA-TMSP)
CAS	10497-05-9
Chemical Formula	C9H27O4PSi3
Appearance	Colorless Liquid
Purity	99.9% (Battery Grade)
Molecular Weight	314.54 g/mol
Boiling Point	~228-229 °C/720 mmHg (lit.)
Density	0.945 g/mL at 25 °C (lit.)
Package Size	25 g/bottle

Notes: Please store the TMSP solution in the glovebox due to its sensitivity to humidity and oxygen 

References: 

1. H. Rong, et al. Enhanced cyclability of LiNi0.5Mn1.5O4 cathode in carbonate based electrolyte with incorporation of tris(trimethylsilyl)phosphate (TMSP), J. Power Sources, 2014, 261, 148-155.
2. X. Liao, et al. Tris(trimethylsilyl)phosphate as electrolyte additive for self-discharge suppression of layered nickel cobalt manganese oxide, Electrochimica Acta, 2016, 212, 352-359.