Repair and regeneration method of lithium cobaltate cathode material in waste batteries

Abstract

The invention discloses a method for repairing and regenerating lithium cobalt oxide positive electrode materials in waste batteries. In the method, the lithium cobalt oxide positive electrode pieces obtained by dismantling are calcined to obtain waste lithium cobalt oxide; Heat the waste lithium cobaltate, wash and filter, remove the impurities in the waste lithium cobaltate, and obtain the waste lithium cobaltate secondary powder; disperse the waste lithium cobaltate secondary powder, surfactant and cobalt salt in deionized water, spin Evaporate to obtain lithium cobalt oxide powder coated with cobalt salt; mix the lithium cobalt oxide powder coated with cobalt salt with lithium salt, and calcinate to obtain the repaired and regenerated lithium cobalt oxide positive electrode material; The surface is coated with a layer of cobalt salt of the material, and finally the repaired and regenerated lithium cobaltate cathode material is obtained by high-temperature calcination with lithium supplementation, so as to achieve the purpose of coating while repairing and regenerating, thereby improving the cycle performance of the recycled lithium cobaltate cathode material .

Description

technical field [0001] The invention belongs to the technical field of waste battery recycling, and in particular relates to a method for repairing and regenerating lithium cobaltate cathode materials in waste batteries. Background technique [0002] The recycling of common positive electrode materials for lithium cobalt oxide batteries mainly includes the extraction of valuable metals and repair and regeneration. [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 is currently the most common method for recycling waste batteries. However, this extraction method has high processing costs, requires a large amount of acid and alkali consumption, and produces a large amount of three was...

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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