METHOD FOR REPROCESSING AND SYNTHESIZING METAL OXIDE POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a method for reprocessing a metal oxide positive electrode active material for a lithium secondary battery and a method for synthesizing a metal oxide positive electrode active material for a lithium secondary battery by the method for reprocessing.

SOLUTION: A method for reprocessing a metal oxide positive electrode active material for a lithium secondary battery according to the present invention includes the steps of: (a) dissolving a positive electrode active material from a waste lithium secondary battery using a sulfuric acid solution containing sulfurous acid gas to form a metal ion-containing solution; (b) injecting a sodium hydroxide solution and an aqueous ammonium solution in the metal ion-containing solution to form an electrode active material precursor; and (c) further filtrating, drying and grinding the electrode active material precursor, thus to obtain a solid-state positive electrode active material precursor. A method for synthesizing a metal oxide positive electrode active material for a lithium secondary battery according to the present invention comprises a step of mixing the electrode active material precursor formed by the method for reprocessing with lithium carbonate or lithium hydroxide, followed by heat treatment, to form a metal oxide positive electrode active material.

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