Electrolyte for potassium ion battery, potassium ion battery, electrolyte for potassium ion capacitor, and potassium ion capacitor

摘要

A potassium ion battery or an electrolytic solution for a capacitor from which a potassium ion battery or a capacitor excellent in passivity formation can be obtained, and a potassium ion battery or a capacitor provided with the electrolytic solution. At least one potassium salt compound selected from the group consisting of potassium bis (trifluoromethanesulfonyl) amide and potassium bis (fluorosulfonyl) amide, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, penta At least one solvent selected from the group consisting of ethylene glycol dimethyl ether, ethylene carbonate, and propylene carbonate, and the potassium salt compound has a concentration of 1.5 mol / kg or more and 12.0 mol / kg or less Electrolyte for ion batteries or capacitors.