EMIM NTf₂ (CAS 174899-82-2): Ionic Liquid Electrolytes for Batteries, Supercapacitors, and Beyond
1-Ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide — EMIM NTf₂ — is the benchmark hydrophobic room-temperature ionic liquid. Its weakly coordinating NTf₂ anion pairs with the EMIM cation to give a water-immiscible, thermally robust, wide-window electrolyte medium that has become a default choice in lithium-metal, sodium, and supercapacitor research as well as in biphasic catalysis and separations.
Chemical Identity and Key Properties
| Property | Value |
|---|---|
| CAS Number | 174899-82-2 |
| Molecular Formula | C₈H₁₁F₆N₃O₄S₂ |
| Molecular Weight | 391.31 g/mol |
| Appearance | colorless to pale yellow liquid |
Electrolyte Applications
The liquid offers a wide electrochemical stability window and negligible volatility; as a salt-solvation medium (with LiTFSI or NaTFSI) it supports safer high-voltage cells, and as a thermally stable medium it serves double-layer and pseudocapacitor devices where acetonitrile would be unsafe.
Catalysis and Separations
As a non-volatile polar medium, EMIM NTf₂ hosts transition-metal catalysis and biphasic workups; its density and hydrophobicity simplify aqueous/organic separation of product streams.
Purity and Handling Guidance
Electrochemical-grade material is specified with low water (<50 ppm typical), low halide, and controlled residual solvents — trace water and chloride directly degrade performance in battery testing. Store under dry nitrogen; handle with standard laboratory practice.
Frequently Asked Questions
What water content should battery-grade EMIM NTf₂ meet?
Specification depends on the device; research electrolytes commonly require <50 ppm, and specialized drying to <20 ppm can be arranged.
Is EMIM NTf₂ compatible with lithium-metal anodes?
It is widely studied as a component of electrolyte blends for Li and Na systems; performance depends on formulation, purity, and testing protocols.
Can CoreyChem supply electrochemical-grade material?
Yes — with water/halide specification, COA, and custom packaging under inert atmosphere.
Source from CoreyChem
CoreyChem supplies 1-Ethyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide (EMIM NTf₂) (CAS 174899-82-2) with lot-specific COA and MSDS documentation. Custom synthesis, higher purity grades, and bulk packaging are available on request — contact our technical team with your target specification and quantity for current lead time and pricing.