SL (Sulfolane, >99.9%) as Battery Electrolyte Solvent, 100-500 g/bottle, CBESSL
Use your own shipping account?
We support FedEx, UPS, and DHL third-party billing for institutional customers.
Place your order first, then email shipping@echemsupplies.com with your account details and order number. We'll generate the label using your account and refund your shipping charges, less a handling fee.
Sulfolane (tetramethylene sulfone, C4H8O2S, Mw = 120.17 g/mol) is a cyclic sulfone solvent widely employed in high-voltage, non-flammable, and thermal-abuse-tolerant battery electrolytes. Its prominence stems from its extreme oxidative stability (>5.0–5.5 V vs. Li/Li+), exceptional thermal tolerance (boiling point ~ 285°C, flash point ~ 165°C, and strong dielectric polarity. It is primarily deployed in 5 V spinel cathodes (LiNi0.5Mn1.5O4 / LNMO), high-voltage sodium-ion systems, and abuse-resistant lithium cells. However, pure sulfolane has severe physical and electrochemical bottlenecks: a high melting point (27.5°C), high dynamic viscosity and poor native SEI film-formation on graphite and alkali-metal anodes.
The underlying mechanisms of high voltage oxidation resistance mainly from: The sulfur atom in sulfolane is in a high +6 oxidation state bonded to two strongly electronegative oxygen atoms (-SO2-). This electron-withdrawing configuration substantially pulls electron density away from the five-membered ring, dropping its highest occupied molecular orbital (HOMO) energy level far below that of cyclic carbonates: Prevents spontaneous electron transfer from the solvent into the empty eg orbitals of high-potential cathodes like LiNi0.5Mn1.5O4 (4.9 V), high-cutoff P2-layered sodium oxides (>4.3 V), or LiCoPO4 (4.8 V).Suppresses transition-metal-catalyzed acid decomposition and oxidative CO2 degassing.
| Part Number |
CBESSL (C-BES-SL) |
| CAS |
126-33-0 |
| Chemical Formula |
C4H8O2S  |
| Appearance |
Colorless Liquid |
| Purity |
99.9% (Battery Grade) |
| Molecular Weight | 120.17 g/mol |
| Boiling Point | 285 °C (lit.) |
| Package Size | 100 g, 200 g, and 500 g/bottle |
Notes: Please store the SL solvent in a dry place (glovebox or dryroom is the best option)
References:
- J. Zhou, et al. Anion-regulated weakly solvation sulfolane-based electrolyte towards high-voltage lithium metal batteries, Chemical Engineering Journal, 2025, 504, 158857
- Z. Li, et al. Nonvolatile and Nonflammable Sulfolane-Based Electrolyte Achieving Effective and Safe Operation of the Li–O2 Battery in Open O2 Environment, Nano Lett. (2022) 22 (2): 815–821.