▎ 摘　　要

NOVELTY - A mixed active material is prepared by mixing a high-nickel positive electrode material and sodium-iron sulfate positive electrode material. USE - Mixed active material is used in lithium-sodium mixed ion battery (claimed). ADVANTAGE - The mixed active material ensures high working voltage and energy density of the battery, and improves high rate, long cycle and low-temperature working performance of the battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a lithium-sodium mixed ion battery, which comprises positive electrode sheet, negative electrode sheet, an electrolyte and a diaphragm. The positive electrode sheet comprises positive electrode current collector, and a positive electrode material formed on the positive electrode current collector. The positive electrode material comprises a mixed active material, a conductor and a binder. The negative electrode sheet is a lithium metal negative electrode or combination of negative electrode current collector and negative electrode material. The electrolyte comprises an organic solvent, an inorganic salt and an additive. The diaphragm separates the positive electrode sheet from the negative electrode sheet.