Sodium Bis(fluorosulfonyl)imide(NaFSI),Battery Grade 500g

Sodium Bis(fluorosulfonyl)imide (NaFSI), Battery Grade 500g

Chemical Name: Sodium Bis(fluorosulfonyl)imide
CAS Number: 100669-96-3
Product Code: EL100669-96-3
Grade: Battery Grade
Brand: Xnergy

Product Introduction

Sodium bis(fluorosulfonyl)imide (NaFSI) is the sodium-ion counterpart of LiFSI and is rapidly gaining adoption in Na-ion battery research for its superior ionic conductivity and thermal stability relative to NaPF₆. The FSI⁻ anion is highly charge-delocalized, enabling strong Na⁺ dissociation and high transference numbers in both ether and carbonate solvents. NaFSI forms a stable, ionically conductive SEI on hard carbon anodes and is compatible with a wide range of Na-ion cathode materials. At elevated concentrations, NaFSI-based electrolytes show reduced Al corrosion and improved cycling stability. Xnergy supplies battery-grade NaFSI for Na-ion electrolyte research and development.

Key Features

• Higher conductivity than NaPF₆ — FSI⁻ anion enables fast Na⁺ transport across a range of solvents and concentrations
• Thermally stable — does not generate HF upon hydrolysis; more moisture-tolerant than NaPF₆ in typical lab conditions
• Stable SEI on hard carbon — FSI⁻ decomposition products contribute to a robust interphase on hard carbon anodes
• High-concentration electrolyte compatible — suitable for concentrated NaFSI formulations with reduced Al corrosion
• Purity ≥99% / H₂O ≤10 ppm / Acid ≤10 ppm — battery-grade quality for Na-ion cell research
• Flexible volumes — available from 500 g to bulk quantities

Specification

Application Areas

• NaFSI-based electrolyte formulation for Na-ion full-cell cycling (hard carbon || layered oxide)
• High-concentration NaFSI/ether electrolyte for Na-metal battery research
• Hard carbon anode SEI characterization using NaFSI vs. NaPF₆ comparative studies
• Prussian blue analog and NASICON cathode evaluation with NaFSI electrolyte
• Na-ion solid-state electrolyte co-salt or interfacial additive studies
• Temperature-range electrolyte evaluation for Na-ion cells at elevated and sub-zero temperatures

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