1-Butyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide, CAS: 254731-29-8

Key Applications:

Advanced Electrolytes for High‑Performance Energy Storage

• Serves as a hydrophobic ionic liquid electrolyte or co‑solvent in lithium‑ion, sodium‑ion, and magnesium‑ion battery systems where moisture sensitivity is critical.
• Enhances electrochemical stability windows and supports high‑voltage cathode chemistries due to the BETI anion’s exceptional oxidative stability.
• Used in supercapacitors and hybrid capacitors to improve ionic conductivity at elevated temperatures and reduce volatility compared to conventional organic solvents.

High‑Temperature and Extreme‑Environment Fluids

• Functions as a thermally stable heat‑transfer medium for applications requiring low vapor pressure and resistance to decomposition.
• Suitable for vacuum systems, high‑temperature lubrication, and sealed electrochemical devices where conventional fluids degrade.

Reaction Media for Fluorinated and Water‑Sensitive Chemistry

• Provides a non‑aqueous, highly hydrophobic environment ideal for fluorination reactions, organometallic transformations, and moisture‑sensitive catalysis.
• Supports phase‑separated catalysis and biphasic extraction where selective solvation of fluorinated species is advantageous.

Materials Science & Surface Engineering

• Used in the fabrication of fluorinated polymer composites, ionogels, and solid‑state electrolytes where low water uptake and high dielectric stability are required.
• Acts as a templating or dispersing medium for nanoparticles, especially fluorinated or hydrophobic nanomaterials.

Electrochemical Devices & Sensors

• Enables stable operation of electrochemical sensors, reference electrodes, and ionic‑liquid‑based actuators under harsh environmental conditions.
• Supports ionic gating and electrochemical modulation in advanced materials research.

Gas Absorption & Separation

• Exhibits selective solubility for certain gases—particularly fluorinated gases and non‑polar species—making it useful in exploratory work on gas capture, membrane materials, and separation processes.

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