Method for recycling valuable components from waste lithium cobalt oxide battery positive electrode sheet

Abstract

The invention discloses a method for recycling valuable components from a waste lithium cobalt oxide battery positive electrode sheet, and belongs to the field of waste lithium battery recycling. According to the method, residual electrolyte and an organic binding agent in the positive electrode sheet are removed by using a pyrolysis method, and the thermal reduction of the positive electrode sheet lithium cobalt oxide is synchronously realized; efficient dissociation of the positive electrode sheet material particles and the aluminum foil is realized through hydraulic stirring and water bathheating, and the purposes of ion formation of the water-soluble lithium-containing compound and separation of the lithium element and the cobalt element are achieved synchronously; separating and purifying of the electrode material and the aluminum foil are achieved by adopting a screening method; and purifying of the cobalt element is achieved through an acid leaching method by means of an acid without a reducing agent. According to the technical scheme of the method, the purposes of removing organic matters in the electrode sheet and performing metal ion thermal reduction are achieved synchronously.

Description

technical field [0001] The invention belongs to the technical field of recycling old lithium batteries, and in particular relates to a method for recovering valuable components from positive plates of waste lithium cobalt oxide batteries. Background technique [0002] In recent years, with the vigorous promotion and use of new energy vehicles and the intensification of the upgrading of electronic products, the output of waste lithium batteries has shown a "blowout" growth. Waste lithium batteries belong to high-grade "metal mines" and are extremely valuable for recycling. In addition, the efficient recycling of waste lithium batteries can not only obtain high-value metals such as cobalt and lithium, but also solve a series of environmental problems caused by waste lithium batteries. [0003] In the recycling process of waste lithium-ion batteries, the efficient dissociation between the electrode material and the current collector and between the electrode material particles ...

AI Technical Summary

Problems solved by technology

[0003] In the recycling process of waste lithium-ion batteries, the efficient dissociation between the electrode material and the current collector and between the electrode material particles is the basis for the resource recovery of the electrode material, but the fine-grained electrode material is bonded on On the electrode sheet, simple mechanical crushing cannot achieve efficient dissociation of electrode materials, resulting in a large amount of electrode material remaining on the electrode sheet, resulting in loss of electrode materials, and the presence of organic binders reduces the metallurgical efficiency of electrode materials

In addition, the trivalent cobalt ions in lithium cobaltate are difficult to dissolve in acid. In the hydrometallurgical process of lithium cobaltate electrode materials, reducing agents need to be added, which leads to increased metallurgical costs and is prone to secondary pollution.

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