Butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, CAS: 258273-75-5

Key Applications:

1. Electrochemical & Energy Storage Applications

• Supporting electrolyte in non‑aqueous systems 

Enhances ionic conductivity and widens the electrochemical stability window in organic solvents.

• Lithium‑ion and sodium‑ion battery research 

Used as an additive or co‑salt to improve SEI formation, suppress dendrites, and stabilize high‑voltage cathodes.

• Supercapacitors and hybrid capacitors 

Provides high ionic mobility and low viscosity when paired with compatible solvents or ionic liquid matrices.

• Electrodeposition media 

Enables smooth, uniform metal deposition due to its low coordinating TFSI anion.

2. Catalysis & Synthetic Chemistry

• Phase‑transfer catalysis 

The quaternary ammonium cation facilitates transport of reactive species across immiscible phases.

• Non‑coordinating reaction medium 

TFSI’s weak coordination supports reactions requiring highly reactive cations or electrophiles.

• Organometallic stabilization 

Useful for generating stable ionic complexes in low‑nucleophilicity environments.

3. Materials Science & Soft Matter

• Polymer electrolytes 

Incorporated into polymer matrices (PEO, PMMA, PVDF) to enhance ionic transport and mechanical flexibility.

• Ion gels and solid-state ionic materials 

Forms stable, low‑volatility ionogels for flexible electronics and sensors.

• Antistatic and charge‑control additives 

The quaternary ammonium headgroup provides persistent surface charge control in coatings and films.

4. Thermal & Transport Applications

• Heat‑transfer and thermal‑stability studies 

High thermal stability of TFSI salts makes them useful in benchmarking ionic liquid performance.

• Solvent‑free ionic media 

BTMA‑TFSI can act as a component in eutectic ionic mixtures to tune viscosity, conductivity, and melting point.

5. Separation Science

• Ion‑pairing reagent in chromatography 

Enhances separation of polar analytes in HPLC and ion chromatography.

• Extraction and purification systems 

Hydrophobic TFSI anion supports selective extraction of metal ions and organic species.

6. Environmental & Industrial Chemistry

• Electrochemical CO₂ reduction studies 

Provides a stable, low‑nucleophilicity medium for probing catalytic pathways.

• Corrosion‑resistant ionic environments 

TFSI salts are used in testing metal stability under extreme conditions.

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