Recycling method of waste lithium battery positive electrode material

• Main Authors: ZHANG LIWEI, YE YINGFENG, HAN DONGQIANG
• Format: Patent
• Language: Chinese; English
• Published: 12.07.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to the technical field of lithium battery recovery, and provides a recovery method of a waste lithium battery positive electrode material. The recovery method comprises the following steps: S1) discharging, crushing and screening; S2) separating an active material; S3) carrying out ball-milling reduction; and S4) carrying out acid leaching recovery. The ball-milling reduction comprises the following steps: adding hydrazine hydrate, ethylenediamine tetramethylenephosphonic acid and methyl gallate into deionized water to prepare a reduction solution, and then carrying out heating ball-milling on the active material and the reduction solution in a ball mill so as to reduce the high-valence metal in the active material. And the acid leaching recovery comprises the following steps: filtering the ball-milled material, washing filter residues with deionized water, and then immersing into a hydrochloric acid solution for leaching. By the adoption of the recovery method, the leaching rate of the