Potassium Bis(fluorosulfonyl)imide(KFSI),Battery Grade 500g

Potassium Bis(fluorosulfonyl)imide (KFSI), Battery Grade 500g

Chemical Name: Potassium Bis(fluorosulfonyl)imide
CAS Number: 14984-76-0
Product Code: EL14984-76-0
Grade: Battery Grade
Brand: Xnergy

Product Introduction

Potassium bis(fluorosulfonyl)imide (KFSI) is the potassium-ion counterpart of LiFSI and NaFSI, and has attracted significant interest for K-ion battery research due to its high ionic conductivity and favorable interphase-forming properties. The FSI⁻ anion promotes high K⁺ dissociation and fast ion transport, and KFSI-derived decomposition products contribute to a robust solid electrolyte interphase (SEI) on graphite and hard carbon anodes that better accommodates the large K⁺ volume change during intercalation than KPF₆-based electrolytes. KFSI is also compatible with ether solvents, expanding the electrolyte design space for K-metal battery research. Xnergy supplies battery-grade KFSI for K-ion battery research.

Key Features

• Higher conductivity than KPF₆ — FSI⁻ anion facilitates strong K⁺ dissociation and fast ion transport in carbonate and ether solvents
• Superior SEI quality on graphite — KFSI-derived SEI better accommodates K⁺ volume change in graphite anodes than KPF₆
• Ether solvent compatible — extends design space to DME, DOL, and other ether-based K-metal electrolytes
• Thermally stable — FSI⁻ anion does not generate HF on hydrolysis; more moisture-tolerant than KPF₆
• Purity ≥99% / H₂O ≤10 ppm / Acid ≤10 ppm — battery-grade quality for K-ion electrolyte research
• Flexible volumes — available from 500 g to larger research quantities

Specification

Application Areas

• KFSI/ether electrolyte formulation for K-metal battery research
• KFSI/carbonate electrolyte for K-ion graphite anode SEI improvement
• K-ion full-cell (PBA cathode || graphite anode) long-cycle-life electrolyte screening
• Comparative salt study: KFSI vs. KPF₆ for graphite anode coulombic efficiency
• Hard carbon anode K⁺ storage mechanism studies with KFSI electrolytes
• High-concentration KFSI electrolyte formulation for K-metal battery research

Related Products

• Potassium Hexafluorophosphate (KPF₆), Battery Grade
• Potassium Bis(trifluoromethanesulfonyl)imide (KTFSI), Battery Grade
• Sodium Bis(fluorosulfonyl)imide (NaFSI), Battery Grade
• Lithium Bis(fluorosulfonyl)imide (LiFSI), Battery Grade
• Browse the full Salts category.