The physicochemical and electrochemical properties of the binary ionic liquid, K[FSA]–[C 3 C 1 pyrr][FSA] (FSA = bis(fluorosulfonyl)amide; C 3 C 1 pyrr = N -methyl- N -propylpyrrolidinium), were investigated at 253–393 K, with the aim of developing a new electrolyte for potassium-ion batteries (K-ion batteries; KIBs). A phase diagram was constructed from the results of differential scanning calorimetry measurements and revealed that the melting point of this ionic liquid is below room temperature for compositions of x (K[FSA]) = 0–0.25 ( x (K[FSA]) = molar fraction of K[FSA]). The viscosity, ionic conductivity, and density were measured for x (K[FSA]) = 0–0.25. The ionic conductivity when x (K[FSA]) = 0.20 was 4.8 mS cm –1 at 298 K, which is higher than that for the equivalent sodium and lithium ionic liquids. Cyclic voltammetry measurements of M[FSA]–[C 3 C 1 pyrr][FSA] ionic liquids ( x (M[FSA]) = 0.20; M = K, Na, or Li) indicated that potassium metal deposition/dissolution occurs at a more negative potential than that for lithium and sodium deposition/dissolution, suggesting that KIBs with a high operating voltage can be constructed using K[FSA]–[C 3 C 1 pyrr][FSA] as an ionic liquid electrolyte.
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Yamamoto et al. (2017) studied this question.