Ionic Liquids
Explore RoCo®'s comprehensive catalog of high-purity ionic liquids and molten salts for industrial, academic, and commercial applications. Our portfolio includes imidazolium, pyrrolidinium, piperidinium, ammonium, phosphonium, and sulfonium systems engineered for energy storage, catalysis, electrochemistry, and advanced materials. Use the cation and anion filters to find exactly what you need, or contact our team for custom formulations. Learn more about ionic liquid properties and applications →
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1-(2-Methoxyethyl)-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >98%, CAS: 757240-24-7
Price range: $69.34 through $1,102.60Product Code: IL-0359-HP -
1-Methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99.5% Battery Grade, CAS: 223437-05-6
Price range: $106.05 through $1,379.98Product Code: IL-0044-UP -
1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99.5% Battery Grade, CAS: 223437-11-4
Price range: $106.05 through $1,379.98Product Code: IL-0035-UP -
1-Ethyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99%, CAS: 223436-99-5
Price range: $147.09 through $7,589.66Product Code: IL-0167-HP -
1-Hexyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99%, CAS: 380497-19-8
Price range: $148.58 through $7,818.96Product Code: IL-0092-HP -
1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99.5% Optical Purity-Colorless, CAS: 223437-11-4
Price range: $148.58 through $1,954.64Product Code: IL-0035-OP -
1-Methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99.5% Optical Purity- Colorless, CAS: 223437-05-6
Price range: $186.77 through $2,444.52Product Code: IL-0044-OP -
1-Methyl-1-octylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99%, CAS: 927021-43-0
Price range: $215.08 through $2,853.54Product Code: IL-0121-HP
About Our Ionic Liquid Product Families
High-Purity Ionic Liquids for Research, Industry & Energy Storage
Discover high‑purity RoCo® ILs and molten salts engineered for industrial, academic, and commercial applications. Our portfolio includes imidazolium, pyrrolidinium, piperidinium, ammonium, phosphonium, sulfonium, and triazolium systems designed for energy storage, catalysis, electrochemistry, and advanced materials development. Access competitive pricing, reliable supply, and expert technical support.
RoCo® is a leading North American supplier of ionic liquids, delivering high‑purity materials with exceptional thermal stability, ionic conductivity, and tunable viscosity. Whether you need catalog products or custom formulations, RoCo® provides scalable, high‑quality solutions for researchers, manufacturers, and industry partners.
Learn more about ionic liquid properties, tunability, and applications on our Technology page.
Explore Our Ionic Liquids Families
Imidazolium
Widely used as solvents and reaction media, imidazolium offers tunable polarity, strong thermal stability, and excellent ionic conductivity for catalysis, electrochemistry, and materials processing.
Pyrrolidinium
Pyrrolidinium systems deliver outstanding electrochemical and thermal stability, making them preferred electrolytes for lithium‑ion, sodium‑ion, fuel cells, and supercapacitors.
Piperidinium
Piperidinium provides robust chemical and thermal resistance, supporting high‑temperature energy storage, lubrication, and advanced electrochemical applications.
Ammonium
Cost‑effective and versatile, ammonium compounds are used in catalysis, electroplating, green chemistry, and industrial processing.
Phosphonium
Phosphonium offers exceptional oxidative and thermal stability, ideal for heat‑transfer fluids, high‑performance lubricants, and polymer processing. Their low volatility enhances safety in demanding environments.
Sulfonium
Sulfonium remains stable under extreme conditions and supports chemical processing, polymer modification, and electrochemical applications. They also provide a non‑toxic, sustainable alternative to traditional solvents.
Triazolium
Triazolium features unique electronic and conductive properties, enabling advanced materials synthesis, specialty chemical development, and next‑generation functional materials.
Which Ionic Liquid Do I Need? — Selection Guide
Match your application to a recommended starting chemistry, then refine with our technical team or request a custom synthesis.
| Your application | Start with cation | Start with anion | Why |
|---|---|---|---|
| Li-ion battery electrolyte (3.7–4.2 V) | Pyrrolidinium | TFSI− | Wide electrochemical window, proven Li-ion stability |
| High-voltage battery (>4.5 V) | Piperidinium | FSI− | Superior anodic stability, lower viscosity |
| Sodium-ion battery electrolyte | Pyrrolidinium | FSI− | Good Na⁺ transport, stable interface |
| Electrochemistry / electrodeposition | Imidazolium | BF4− or TFSI− | High conductivity, low viscosity |
| Catalysis / green-solvent reaction media | Imidazolium | TFSI−, PF6− or dicyanamide | Tunable polarity, thermal stability |
| High-temperature process (>250 °C) | Phosphonium | TFSI− | Best-in-class thermal stability |
| Gas separation / CO₂ capture | Imidazolium | Acetate or dicyanamide | High CO₂ solubility |
| Extraction / separations | Ammonium or Phosphonium | PF6− or TFSI− | Hydrophobic, water-immiscible |
| Lubrication / tribology | Phosphonium | TFSI− | Thermal + oxidative stability |
Need a chemistry that isn’t listed? RoCo® synthesizes custom cation-anion combinations to spec. Request custom ionic liquid synthesis →
Choosing by Anion
The anion controls hydrophobicity, viscosity, conductivity, and electrochemical stability. TFSI− (bis(trifluoromethylsulfonyl)imide) is the hydrophobic, wide-window workhorse for batteries and electrochemistry. FSI− (bis(fluorosulfonyl)imide) offers lower viscosity, higher conductivity, and better SEI formation — favored for high-rate and high-voltage cells. BF4− and PF6− suit general electrochemistry and separations at lower cost, while acetate, dicyanamide, and triflate serve specialized solvent, catalysis, and gas-capture applications.
Why Choose RoCo® for Ionic Liquids?
- High‑purity Ils and molten salts
- Custom formulations for specialized applications
- Competitive pricing and scalable supply
- Technical support from experienced chemists
- Reliable North American sourcing and logistics
RoCo® ensures high‑quality ionic salts remain accessible for both research and commercial deployment.
Applications of RoCo®’s Ionic Liquids
- Energy Storage: Electrolytes and additives for lithium‑ion, sodium‑ion, magnesium‑ion, and redox‑flow batteries
- Green Chemistry: Non‑volatile, eco‑friendly alternatives to traditional organic solvents
- Electroplating & Surface Engineering: Improved plating uniformity, corrosion resistance, and metal deposition control
- Lubricants & Heat‑Transfer Fluids: Reduced friction, enhanced thermal conductivity, and safer high‑temperature performance
- Polymer & Materials Science: Improved polymer properties, enhanced processing, and support for advanced recycling technologies
- Catalysis & Synthesis: Tunable reaction media for homogeneous and heterogeneous catalytic systems
Ionic Liquids — Ordering & Product FAQs
What purity grades do RoCo® ionic liquids come in?
RoCo® offers ionic liquids in standard grade (≥95%), high-purity grade (≥98–99%), and ultra-high-purity grade (≥99.9%) with full Certificate of Analysis (COA) and Safety Data Sheet (SDS) included with every order. Custom purity specifications are available through our synthesis services.
What is the minimum order quantity for ionic liquids?
RoCo® offers flexible ordering from research-scale quantities (as low as 5g or 25g) through bulk industrial volumes. Most catalog products are available in 25g, 100g, 500g, and 1kg packaging. Contact our team for custom volume pricing and lead times.
Which ionic liquid is best for battery electrolytes?
Pyrrolidinium and piperidinium-based ionic liquids paired with TFSI− or FSI− anions are widely preferred as battery electrolytes due to their wide electrochemical windows (up to 5–6V), high ionic conductivity, and excellent thermal stability. Browse our dedicated Battery Materials category or contact us for application-specific recommendations.
Where does RoCo® ship ionic liquids?
RoCo® ships via FedEx to all 50 U.S. states, Washington D.C., and Canada, to commercial and business addresses only (no residential addresses or P.O. boxes). Every order includes full Certificate of Analysis (COA) and Safety Data Sheet (SDS) documentation. For destinations outside the U.S. and Canada, contact our team to discuss available options.
How do I choose the right ionic liquid for my application?
Start with the cation family that matches your stability and viscosity needs, then choose the anion for the right hydrophobicity and electrochemical behavior. For batteries, pyrrolidinium or piperidinium cations with TFSI− or FSI− anions are standard; for electrochemistry and catalysis, imidazolium is the common starting point; for high-temperature work, phosphonium excels. See the selection guide above, or contact our team for a specific recommendation.
What is the difference between TFSI and FSI anions?
Both are fluorinated sulfonylimide anions used in battery-grade and electrochemical ionic liquids. FSI− generally offers lower viscosity, higher ionic conductivity, and superior SEI formation, while TFSI− offers slightly wider electrochemical and thermal stability. FSI is often preferred for high-rate and high-voltage cells; TFSI is the general-purpose workhorse.
Need Support?
Contact our team for product recommendations, technical guidance, and custom formulation support.