[EMIM]OTf (1-Ethyl-3-methylimidazolium trifluoromethanesulfonate, >99.9%) Ionic Liquid as Battery Electrolyte Solvent, 25-100 g/bottle, CBESEMIMOTf

[EMIM]OTf (1-Ethyl-3-methylimidazolium trifluoromethanesulfonate) is a well-known room-temperature ionic liquid (RTIL) combining an aromatic imidazolium cation with the fluorinated sulfonate triflate (CF3SO3^-) anion. By pairing a fluid, low-viscosity imidazolium base with a relatively stable and highly soluble triflate anion, this ionic liquid offers favorable transport kinetics, though its application in battery systems is constrained by the inherent limitations of the aromatic ring.

The key physicochemical & electrochemical characteristics are: (1) Low Viscosity & High Ionic Conductivity: Compared to bulkier cyclic ammonium or piperidinium RTILs, [EMIM]OTf exhibits remarkably low viscosity and high ionic conductivity at ambient temperatures, facilitating rapid ion transport and minimizing internal cell polarization. (2) Good Thermal & Chemical Stability: Like other ionic liquids, it is non-flammable, possesses negligible vapor pressure, and remains thermally stable up to high temperatures, mitigating the volatility and fire risks associated with traditional organic carbonate solvents. (3) Anion Compatibility: The triflate anion is chemically stable, resists hydrolysis compared to PF6^- or BF4^- (meaning no hazardous HF generation from trace moisture), and forms stable conductive solutions with various alkali metal triflate salts (e.g., LiOTf or NaOTf).

Part Number	CBESEMIMOTf (C-BES-EMIMOTf)
CAS	145022-44-2
Chemical Formula/Structure	C7H11F3N2O3S
Appearance	Colorless Liquid
Molecular Weight	260.23 g/mol
Density	1.387 g/mL at 25 °C (lit.)
Boling Point	>350 °C (lit.)
Package Grade	25 g, 50 g, and 100 g/bottle

References

(1）J. S. McIntosh, et al., Supporting Electrolyte Design for Stable Nonaqueous Redox-Flow Batteries, ACS Electrochem. (2025) 1 (8): 1293–1303.

(2) Q. Ming, et al., Ionic Liquid Additive Enables Dual-Interfacial Stabilization for High-Voltage Lithium–Metal Batteries with Low-Concentration Electrolytes, ACS Appl. Mater. Interfaces (2026) 18 (12): 17915–17928.