Lithium Bis(fluorosulfonyl)imide(LiFSI),Battery Grade 500g

Lithium Bis(fluorosulfonyl)imide (LiFSI), Battery Grade 500g

Chemical Name: Lithium Bis(fluorosulfonyl)imide
CAS Number: 171611-11-3
Product Code: EL171611-11-3
Grade: Battery Grade
Brand: Xnergy

Product Introduction

Lithium bis(fluorosulfonyl)imide (LiFSI) has emerged as one of the most important next-generation electrolyte salts for lithium-ion and lithium metal batteries. Its FSI⁻ anion combines the high ionic conductivity of a charge-delocalized imide with reduced Al corrosivity compared to TFSI⁻ — LiFSI passivates rather than corrodes Al at high voltage when used at sufficient concentration or with appropriate co-solvents. LiFSI delivers superior ionic conductivity to LiPF₆ in many solvent systems and is the salt of choice for high-concentration electrolytes (HCE) and localized high-concentration electrolytes (LHCE) that have demonstrated outstanding performance in Li-metal batteries. Xnergy supplies battery-grade LiFSI for research from 500 g to production quantities.

Key Features

• Higher ionic conductivity than LiPF₆ — FSI⁻ anion enables faster Li⁺ transport in both carbonate and ether solvents
• Reduced Al corrosivity vs. LiTFSI — passivates Al current collector at high concentration or with compatible co-solvents
• Key salt for HCE and LHCE — forms the basis of high-concentration (3–5 M) and localized high-concentration electrolytes for Li-metal batteries
• Excellent SEI-forming capability — FSI⁻ decomposition products contribute to stable, LiF-rich interphases on both anode and cathode
• Purity ≥99% / H₂O ≤10 ppm / Acid ≤10 ppm — battery-grade quality for demanding electrolyte formulation
• Flexible volumes — available from 500 g for laboratory use to bulk production quantities

Specification

Application Areas

• High-concentration electrolyte (HCE) formulation: 3–5 M LiFSI in DME or carbonate solvents
• Localized high-concentration electrolyte (LHCE) with fluorobenzene (FB) or BTFE diluent
• Li-metal anode battery electrolyte for improved coulombic efficiency and dendrite suppression
• Silicon anode full-cell electrolyte with LiFSI for improved cycle life
• Solid-state electrolyte co-salt in sulfide or oxide SSE systems
• Na-ion analog research using NaFSI for direct comparison of FSI⁻ behavior

Related Products

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• Lithium Bis(trifluoromethanesulfonyl)imide (LiTFSI), Battery Grade
• Sodium Bis(fluorosulfonyl)imide (NaFSI), Battery Grade
• Fluoroethylene Carbonate (FEC), Battery Grade
• Browse the full Salts category.