Short-range solid-phase repair and regeneration method for waste lithium iron phosphate positive electrode material

Abstract

The application discloses a short-range solid-phase repairing and regenerating method of waste lithium iron phosphate positive electrode material, and steps comprise: positive electrode sheet treatment: removing positive electrode current collector to obtain positive electrode active material coating; negative electrode sheet and separator treatment: soaking negative electrode sheet and separator in 5% acetic acid solution and heating to obtain impregnation liquid; adding not more than 1% lithium powder in 5% acetic acid solution; positive electrode active material regeneration: mixing positive electrode active material coating and impregnation liquid, heating to 70-120 DEG C for not less than 15 min, then freezing and grinding, thawing, and repeating freezing and grinding-thawing for 3-15 times, drying to remove water, and high-temperature calcining to complete repairing and regeneration of waste lithium iron phosphate positive electrode material.