Tributylmethylammonium bis(fluorosulfonyl)imide, CAS: 1425637-15-5

Key Applications:

1. Electrolytes for Energy Storage

• Lithium‑ion and sodium‑ion batteries 

TBMA‑FSI serves as a co‑salt or ionic‑liquid additive to improve ionic conductivity, widen the electrochemical stability window, and enhance SEI formation on carbonaceous anodes.

• High‑temperature electrolytes 

The FSI⁻ anion supports low viscosity and high ionic mobility, enabling stable operation in elevated‑temperature cells.

• Redox‑flow and hybrid flow batteries 

Used as a supporting electrolyte to tune viscosity, solubility, and redox kinetics of active species.

2. Electrochemical Devices & Interfaces

• Supercapacitors and hybrid capacitors 

Provides high ionic conductivity and stable double‑layer formation, especially in wide‑temperature‑range devices.

• Electrodeposition media 

TBMA‑FSI can support smooth, uniform metal deposition (e.g., Al, Zn, rare‑earth metals) due to its wide electrochemical window and low water content.

• Electrochemical sensors 

Enhances signal stability and reduces solvent volatility in ionic‑liquid‑based sensing films.

3. Solvents and Reaction Media

• Green solvent for organic synthesis 

The FSI⁻ anion offers strong solvating power for polar and organometallic species, enabling catalyst stabilization and improved reaction rates.

• Phase‑transfer catalysis 

The bulky ammonium cation facilitates ion shuttling between immiscible phases.

• Polymerization media 

Supports controlled radical polymerization and ionic‑liquid‑templated polymer synthesis.

4. Materials Processing & Surface Engineering

• Plasticizer or additive in polymer electrolytes 

Improves mechanical flexibility and ionic conductivity in PEO‑based or PVDF‑based systems.

• Surface modification 

Forms stable ionic‑liquid layers on metals, ceramics, and carbon materials for lubrication, corrosion resistance, or wettability control.

• Nanomaterials synthesis 

Acts as a templating or stabilizing medium for nanoparticles, nanowires, and porous materials.

5. Separation Science & Extraction

• Selective extraction of metal ions 

TBMA‑FSI’s hydrophobicity and ion‑pairing behavior support extraction of transition metals, lanthanides, and actinides.

• Gas absorption media 

Useful for SO₂, HF, and other acidic gases due to the FSI⁻ anion’s affinity and stability.

• Liquid–liquid separations 

Enables tunable partitioning in biphasic ionic‑liquid systems.

6. Thermal & Chemical Stability Applications

• Heat‑transfer and thermal‑storage fluids 

High thermal stability and low vapor pressure make it suitable for niche high‑temperature systems.

• Antistatic and antiscaling additives 

Ionic‑liquid additives in industrial formulations to reduce charge buildup or modify surface interactions.

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