![[BMIM][FSI] {1-Butyl-3-methylimidazolium bis(fluorosulfonyl)imide, >99.9%} Ionic Liquid as Battery Electrolyte Solvent, 25-100 g/bottle, CBESBMIMFSI](http://echemsupplies.com/cdn/shop/files/CBESBMIMFSI_main.jpg?v=1791182689&width=3840)
![[BMIM][FSI] {1-Butyl-3-methylimidazolium bis(fluorosulfonyl)imide, >99.9%} Ionic Liquid as Battery Electrolyte Solvent, 25-100 g/bottle, CBESBMIMFSI](http://echemsupplies.com/cdn/shop/files/CBESBMIMFSI_Structure.jpg?v=1791182771&width=3840)
[BMIM][FSI] {1-Butyl-3-methylimidazolium bis(fluorosulfonyl)imide, >99.9%} Ionic Liquid as Battery Electrolyte Solvent, 25-100 g/bottle, CBESBMIMFSI
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[BMIM][FSI] (1-Butyl-3-methylimidazolium bis(fluorosulfonyl)imide) is a room-temperature ionic liquid (RTIL) that combines an aromatic, 5-membered imidazolium cation (bearing a butyl chain) with the highly mobile, flexible bis(fluorosulfonyl)imide (FSI) anion. By pairing the fast ion-transport kinetics and low viscosity of the FSI anion with the fluid dynamics of an imidazolium base, this formulation offers exceptional ionic conductivity. However, utilizing an imidazolium-based ionic liquid in battery systems introduces distinct electrochemical and interfacial trade-offs.
The key physicochemical & electrochemical characteristics are: (1) Exceptionally High Ionic Conductivity & Low Viscosity: Because the FSI anion possesses a small ionic radius, low molecular weight, and weak charge localization, and because the [BMIM] cation maintains low fluid friction, [BMIM][FSI] exhibits remarkably high ionic conductivity and low viscosity at ambient temperatures compared to bulkier pyrrolidinium or piperidinium imide systems. (2) Favorable Anode Interfacial Chemistry: The FSI anion readily decomposes under cathodic polarization to form a stable, inorganic-rich Solid Electrolyte Interphase (SEI) containing lithium fluoride (LiF) and sulfur-oxygen species, assisting in interfacial stabilization. (3) High Purity (>99.9%): High-purity grades minimize residual halide ions (like chlorides) and trace moisture, which are critical for preventing premature corrosion or parasitic side reactions.
| Part Number |
CBESBMIMFSI (C-BES-BMIMFSI) |
| CAS |
1235234-58-8 |
| Chemical Formula |
C8H15F2N3O4S2  |
| Appearance |
Colorless liquid |
| Purity |
>99.9% (Battery Grade) Water level: <200 ppm |
| Molecular Weight | 319.35 g/mol |
| Density | 1.36 g/cm3 |
| Package Size | 25 g, 50 g, and 100 g/bottle |
Notes: Please try to store the [BMIM][FSI] ionic liquid in the dry place.
References:
- S. Xiong, et al. Design of a Multifunctional Interlayer for NASCION-Based Solid-State Li Metal Batteries, Adv. Funct. Mater., 2020, 30, 2001444
- M Zhou, et al. The synergistic effect induced by “Z-bond” between cations and anions achieving a highly reversible zinc anode, Journal of Colloid and Interface Science, 2025, 683, 30, 92-105