Multi-process efficient synergistic retired lithium ion battery positive electrode material recovery method

Abstract

The invention discloses a multi-process efficient synergistic retired lithium ion battery positive electrode material recovery method, and belongs to the field of retired lithium ion battery recovery.Firstly, a positive plate of a retired lithium ion battery is disassembled; residual electrolyte in the positive plate is removed through heat treatment; then organic matters in the retired lithium ion battery electrode material are removed through pyrolysis, finally, efficient dissociation between the retired lithium ion battery electrode material and a current collector and between electrode material particles is realized through hydraulic crushing, and separation of a fine-grained electrode material and a coarse-grained current collector can be realized through screening; thermal reductionof high-valence transition metal ions in the positive electrode material is synchronously realized through regulation and control of pyrolysis parameters, and leaching of the water-soluble lithium salt is synchronously realized in the hydraulic crushing process. According to the method, multi-process synergistic coupling of organic matter removal in the electrode material, efficient dissociationof the electrode material and thermal reduction of the high-valence transition metal is realized, and the resource path of the retired lithium ion battery is shortened.

Description

technical field [0001] The invention relates to a method for recycling positive electrode materials of decommissioned lithium-ion batteries, and is especially suitable for a method for recycling positive electrode materials of decommissioned lithium-ion batteries with multiple processes and high efficiency and synergy used in the field of environmental protection recycling. Background technique [0002] The positive electrode sheet of retired lithium-ion batteries contains a large amount of valuable components such as nickel, cobalt, lithium, manganese, aluminum, etc., and has strong resource attributes. It has received special attention in the recycling process of retired lithium-ion batteries. Effective recycling is the key to its efficient resource utilization. [0003] The fine-grained positive electrode material is attached to the surface of the aluminum foil current collector through a binder. The gap between the electrode material and the current collector and between...

AI Technical Summary

Problems solved by technology

[0003] The fine-grained positive electrode material is attached to the surface of the aluminum foil current collector through a binder. The gap between the electrode material and the current collector and between the electrode material particles is filled with organic binder. Simple pretreatment methods cannot achieve efficient dissociation of the electrode material. The resource efficiency of electrode materials is low, and the presence of organic binders further reduces the metallurgical efficiency of electrode materials. The removal of organic binders is the key to the efficient recycling of decommissioned lithium-ion battery electrode materials.

In addition, transition metal elements such as nickel, cobalt, and manganese in the positive electrode material exist in a high-valence state, and it is difficult to achieve ionization by acid leaching. Therefore, the hydrometallurgical process needs to add a reducing agent or reduce the electrode material in advance. It is easy to cause environmental pollution, increase the cost of recycling, and make the recycling process of electrode materials extremely complicated

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