Sulfonylamide-Based Ionic Liquids for High-Voltage Potassium-Ion Batteries with Honeycomb Layered Cathode Oxides

The Cover Feature illustrates ionic liquids based on potassium bis(trifluoromethanesulfonyl) amide (KTFSA) salt in 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)amide (Pyr(13)TFSA), which can serve as feasible electrolytes for safe operation at high-voltage conditions for potassium-ion batteries. Electrochemical measurements reveal a wide voltage tolerance, indubitably suggesting KTFSA-based ionic liquids as potent and stable electrolytes for high-voltage cathode materials (such as the honeycomb layered tellurates) for high-performance potassium-ion batteries.More information can be found in the Article by K. Yoshii et al.