Lithium Bis(fluorosulfonyl)imide (LiFSI)
Electronic-grade LiFSI (lithium bis(fluorosulfonyl)imide, CAS 171611-11-3), ≥99.9% with ≤50 ppm HF, supplied wholesale by Zyntex. Conducting salt and LiPF6 co-salt for high-performance lithium-ion electrolytes. CoA and SDS.
Description
Lithium Bis(fluorosulfonyl)imide Product Overview
Lithium bis(fluorosulfonyl)imide (LiN(SO2F)2) is a white, hygroscopic powder that dissolves very well in the carbonate solvents used in battery electrolytes, such as Ethylene Carbonate, Dimethyl carbonate and Ethyl methyl carbonate.
Compared with the standard salt Lithium hexafluorophosphate, LiFSI offers higher ionic conductivity, better thermal and hydrolytic stability, and lower formation of hydrofluoric acid. These properties improve power, cycle life and low-temperature performance. However, LiFSI alone can corrode aluminum current collectors at high voltage, so electrolyte producers usually use it as a co-salt or additive together with LiPF6.
Electronic-grade material requires very low water, free acid and metal impurity levels. For a related imide salt, see LiTFSI (Lithium bis(trifluoromethanesulfonyl)imide).
Key Applications of Lithium Bis(fluorosulfonyl)imide
Main application areas:
🔋 Li-ion Electrolytes
Co-salt with LiPF6 for higher performance.
🚗 EV Batteries
Improves power and cycle life in EV cells.
❄️ Low-Temperature Cells
Enhances conductivity at low temperature.
🔬 Battery Research
Salt for solid-state and next-generation electrolytes.
Lithium Bis(fluorosulfonyl)imide Technical Specifications
| Parameter | Standard Value |
|---|---|
| Product Name | LiFSI |
| CAS Number | 171611-11-3 |
| Molecular Formula / Weight | F2LiNO4S2 / 187.07 g/mol |
| Purity (Assay) | ≥99.9% (Electronic Grade) |
| Free Acid (HF) | ≤50 ppm |
| Documents | CoA and SDS with every lot |
⚠️ Safety & Handling: Harmful if swallowed and causes severe skin burns and eye damage. Handle under dry conditions with chemical-resistant gloves and eye protection. Store in tightly closed containers under dry inert gas, as the salt is very hygroscopic. Always consult the Safety Data Sheet (SDS) for full classification and handling instructions.
Frequently Asked Questions
Why is LiFSI used together with LiPF6?
LiFSI improves conductivity and stability, while LiPF6 passivates the aluminum current collector. The combination gives the best overall performance.
How should LiFSI be stored?
Keep it sealed under dry inert gas. Moisture uptake raises water and acid content, which harms battery performance.
How can I get a price and documents?
Prices depend on quantity, packaging and destination. Contact us with your required volume to receive a quotation together with the CoA and SDS.
