Repair and regeneration method of nickel-cobalt-manganese ternary cathode materials in waste batteries

Abstract

The invention discloses a method for repairing and regenerating nickel-cobalt-manganese ternary positive electrode materials in waste batteries. The method obtains waste nickel-cobalt-manganese ternary materials by calcining the nickel-cobalt-manganese ternary positive electrode pieces obtained by dismantling; The nickel-cobalt-manganese ternary material is dispersed in deionized water, surfactant and liquid alkali are added, and the nickel-cobalt-manganese ternary material solution is added under stirring, and the ternary material coated with the hydroxide ternary precursor is obtained by drying after the reaction. material; the ternary material covered by the ternary hydroxide precursor is mixed with lithium salt, and then calcined to obtain the repaired and regenerated nickel-cobalt-manganese ternary positive electrode material; in this way, the present invention adopts the coating technology, and the surface of the nickel-cobalt-manganese ternary material is Coating a layer of hydroxide ternary precursor, and finally obtaining a repaired and regenerated nickel-cobalt-manganese ternary cathode material through high-temperature calcination of lithium supplementation, achieving the purpose of coating at the same time of repairing and regeneration, thereby improving the recovered nickel-cobalt-manganese ternary cathode. Cyclic performance of materials.

Description

technical field [0001] The invention belongs to the technical field of recycling and utilization of waste batteries, in particular to a method for repairing and regenerating nickel-cobalt-manganese ternary positive electrode materials in waste batteries. Background technique [0002] The recycling of common nickel-cobalt-manganese ternary cathode materials mainly includes extraction of valuable metals and repair and regeneration. [0003] In the prior art, the extraction of valuable metals usually adopts acid leaching to dissolve the positive electrode material to obtain a solution of valuable metal ions, and finally, by removing impurities and precipitation, the inorganic salts of the valuable metals are obtained; The method is simple and easy to implement, and is currently the most common method for recycling waste batteries. However, this extraction method has high processing costs, consumes a large amount of acid and alkali, and generates a large amount of three wastes, ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the extraction of valuable metals usually adopts acid leaching to dissolve positive electrode materials to obtain a solution of valuable metal ions, and finally obtain inorganic salts of valuable metals through removal of impurities and precipitation; this extraction of valuable metals The method is simple and easy, and it is the most common method of recycling waste batteries at present. However, the extraction method has high processing costs, requires a large amount of acid and alkali consumption, and will produce a large amount of three wastes, causing serious pollution to the environment.

[0004] Restoration and regeneration is to restore the physical and chemical indicators of the separated positive electrode material through lithium supplementation, so as to achieve the purpose of repair and regeneration; as an emerging technology, repair and regeneration technology is currently under research and development in the laboratory. , which can realize the repair and regeneration of materials. However, compared with the directly prepared battery materials, due to the presence of some impurities in the materials of the repaired and regenerated battery materials, the impurities in the materials will interact with the electrolyte during the charging and discharging process. side reactions, thus affecting the cycle performance of the material, therefore, the electrochemical performance of the battery material obtained by this method is quite different, and it is difficult to compare with commercial materials