TVSi (Tetravinylsilane, >98.0%) as Battery Electrolyte Additive, 5-25 g/bottle, CBEATVSi

Tetravinylsilane (TVSi) is a tetra-functional organosilicon additive featuring four reactive vinyl groups (-CH=CH2) bound to a central silicon atom (Si(CH=CH2)4). It serves as a cross-linking film-former, cathode passivator, and dendrite-suppressing interphase builder in non-aqueous electrolytes for lithium-ion (LIBs), silicon-anode, lithium-metal, and post-lithium batteries. The core functional roles & electrochemical advantages are shown below:

(1) High-Density Cross-Linked Polymeric Interphase (SEI & CEI): TVSi contains four symmetrically arranged, electron-rich vinyl double bonds. During initial formation or electrochemical cycling, TVSi undergoes multi-directional radical polymerization at lower reduction potentials on the anode (~ 1.2–1.4 V vs. Li/Li+) and higher oxidation potentials on the cathode. This yields a 3D cross-linked poly-siloxane/poly-alkene network across both electrode surfaces that is significantly more thermally and mechanically resilient than linear polymer interphases formed by mono- or di-vinyl additives. 

(2) High-Voltage Cathode Passivation & Transition Metal Retention: On high-voltage nickel-rich cathodes (NMC811, NCMA) or high-voltage cobalt oxides (>4.4 V vs. Li/Li+), TVSi oxidizes to form a silane-derived Cathode Electrolyte Interphase (CEI). This layer blocks catalytic surface defects, preventing transition-metal leaching (Ni^{3+}/Ni}^{4+}, Mn^{3+}) and suppressing parasitic oxidation of carbonate co-solvents (EC, EMC).

(3) Homogeneous Li+ Flux & Dendrite Mitigation: The rigid yet flexible organosilicon network acts as an ion-sieve, leveling local electric field variations on alkali-metal anodes. This promotes uniform Li+ deposition, suppressing dendritic nucleation and improving Coulombic efficiency in lithium-metal batteries.

Part Number	CBEATVSi (C-BEA-TVSi)
CAS	1112-55-6
Chemical Formula	Si(CH=CH2)4
Appearance	Colorless Liquid
Purity	>98.0%
Molecular Weight	136.27 g/mol
Boiling Point	130-131 °C (lit.)
Density	0.8 g/mL at 25 °C (lit.)
Package Size	5 g, 10 g and 25 g/bottle

Notes: Please try to store the TVSi liquid in a dry place (glovebox is the best)

References: 

1. Z. Lin, et al. In situ construction of an electron-withdrawing polymer coating layer on NCM811 interface for high-performance lithium-ion batteries, Energy Storage Materials, 2024, 73, 103876.
2. Y. Huang, et al. Tailored Interphases Construction for Enhanced Si Anode and Ni-Rich Cathode Performance in Lithium-Ion Batteries, CCS Chem. 2025, 7, 429–439