▎ 摘　　要

NOVELTY - A lithium-potassium hybrid ion battery, comprising a cathode composed of carbon composite sulfide, a counter electrode composed of potassium foil, a lithium salt-modified separator, and a potassium-ion organic electrolyte. The lithium salt-modified separator is prepared by immersing a glass fiber separator in a lithium salt solution and drying it. USE - Lithium-potassium mixed ion battery. ADVANTAGE - The lithium-potassium mixed ion battery has high performance, high capacity, and improved circulation and capacity. The lithium and potassium become the compatible carrier in the same system, realizing the potassium lithium synergistic energy storage, compared with the single potassium ion battery. The potassium lithium system can stably circulate in the sulfuride cathode The electrolyte in the electrolyte by the lithium loaded with the salt, in the process of charging and discharging the lithium, potassium, potassium intercalation and conversion reaction, realizing potassium lithium energy storage. DETAILED DESCRIPTION - A lithium-potassium hybrid ion battery, comprising a cathode composed of carbon composite sulfide, a counter electrode composed of potassium foil, a lithium salt-modified separator, and a potassium-ion organic electrolyte. The lithium salt-modified separator is prepared by immersing a glass fiber separator in a lithium salt solution and drying it. The general formula of the carbon composite sulfide is MxS@C, where M is iron or molybdenum, and 0 < x ≤ 1. An INDEPENDENT CLAIM is also included for the preparation method of the lithium-potassium mixed ion battery.