Tetraethylammonium bis(trifluoromethylsulfonyl)imide, CAS: 161401-26-9

Key Applications:

Electrochemical Systems

• Serves as a supporting electrolyte in non‑aqueous electrochemical studies due to its high ionic conductivity and wide electrochemical stability window.
• Used in voltammetry, electrosynthesis, and redox‑active material characterization where low coordinating anions minimize ion–electrode interactions.
• Enables stable ion transport in aprotic solvents such as acetonitrile, propylene carbonate, and sulfone‑based media.

Battery and Energy Storage Research

• Functions as a model quaternary ammonium cation for studying ion mobility and solvation in next‑generation electrolytes.
• Supports research on high‑voltage electrolyte formulations where TFSI– anions improve oxidative stability.
• Used in fundamental studies of ion pairing, dielectric relaxation, and transport mechanisms relevant to Li‑ion and Na‑ion battery development.

Ionic Liquid and Deep Eutectic Solvent Design

• Acts as a precursor salt for synthesizing tailored ionic liquids via metathesis with lithium, imidazolium, pyrrolidinium, or phosphonium partners.
• Useful for tuning viscosity, polarity, and hydrophobicity in custom IL formulations.
• Supports structure–property investigations of TFSI‑based ionic liquids.

Materials Science and Polymer Electrolytes

• Incorporated into polymer matrices (e.g., PEO, PMMA, PVDF‑HFP) to enhance ionic conductivity and mechanical flexibility.
• Used in studies of ion transport in solid and gel polymer electrolytes.
• Helps evaluate cation–polymer interactions due to the compact, symmetric tetraethylammonium cation.

Spectroscopy and Fundamental Physical Chemistry

• Employed as a benchmark salt for NMR, FTIR, Raman, and dielectric spectroscopy to probe ion pairing and solvation dynamics.
• Supports thermodynamic studies involving ion association, activity coefficients, and transport numbers in non‑aqueous media.

Phase Behavior and Solubility Studies

• Used to map phase diagrams of electrolyte–solvent systems, especially in highly fluorinated or low‑polarity solvents.
• Helps characterize miscibility, ion clustering, and solvent–salt interactions relevant to electrolyte engineering.

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