A multi-process, efficient and coordinated recovery method for positive electrode materials of decommissioned lithium-ion batteries

Abstract

The invention discloses a multi-process, efficient and coordinated method for recovering positive electrode materials of decommissioned lithium ion batteries, belonging to the field of decommissioned lithium ion battery recovery. First, disassemble the positive electrode sheet of the retired lithium-ion battery, and remove the residual electrolyte in the positive electrode sheet by heat treatment, then remove the organic matter in the electrode material of the retired lithium-ion battery by pyrolysis, and finally realize the retired lithium-ion battery electrode by hydraulic crushing High-efficiency dissociation between materials and current collectors and between electrode material particles, and the separation of fine-grained electrode materials and coarse-grained current collectors can be achieved through sieving; and the high price of positive electrode materials can be realized synchronously through the regulation of pyrolysis parameters. Thermal reduction of state transition metal ions, and simultaneous leaching of water-soluble lithium salts during the hydraulic crushing process. The invention realizes the multi-process synergistic coupling of organic matter removal in electrode materials-high-efficiency dissociation of electrode materials-thermal reduction of high-valence transition metals, and shortens the resource recovery path of decommissioned lithium-ion batteries.

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

Images