Potasium bis(trifluoromethanesulfonyl)imide, abbreviated KTFSI, is a white, crystalline salt. It is hygroscopic and sensitive to air. KTFSI is soluble in water, carbonates (including dimethyl carbonate, diethyl carbonate, and propylene carbonate), glymes and other ethers (such as dimethoxyethane and dioxolane), ionic liquids such as N-butyl-N-methyl bis(trifluoromethanesulfonyl) imide, and many of the solvents commonly used in battery electrolytes.

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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. 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, potassium sulfides, and even organic cathodes. 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. 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.