Sigma-Aldrich POTASSIUM BIS(TRIFLUOROMETHYLSULFONYL)I

KTFSI is used as an electrolytic salt in potassium-ion batteries because of its high solubility in various polar organic solvents, its high ionic conductivity, and its high oxidative stability up to 4 V vs K+/K.[1] Because KTFSI-based electrolytes are sensitive to impurities and trace moisture, our KTFSI is designed for superior purity with less than 250 ppm water. KTFSI is compatible with a wide range of electrodes including metallic potassium anodes, layered tellurates like K₂NiTeO₆ or K₂MgTeO₆,[1] potassium sulfides,[2] and even organic cathodes[3]. Researchers have also used KTFSI in dual-graphite batteries in which the K+ ions intercalate into graphite anodes to form KC₈ and the TFSI- anions intercalate into graphite cathodes.[4] In addition to being studied for intercalation-type electrodes, KTFSI has served as a stable electrolyte in conversion-type battery chemistries, for example with antimony anodes.[5]