Method for recycling metal components from waste lithium ion batteries

Abstract

The invention provides a method for recycling metal components from waste lithium ion batteries. The method comprises the steps of: crushing the waste lithium ion batteries into solid powder, adding a mixed solution of diluted hydrochloric acid and diluted nitric acid after crushing so as to dissolve LiCoO2, Cu and Al in the solid powder, and then filtering; adding an alkaline substance into a solution obtained through filtering, controlling the pH value of the solution obtained through filtering, filtering to obtain Al(OH)3, then adding the alkaline substance into a solution obtained through filtering, controlling the pH value of the solution obtained through filtering, filtering to obtain Cu(OH)2, then adding the alkaline substance into a solution obtained through filtering, controlling the pH value of the solution obtained through filtering, and filtering to obtain Co(OH)2. In the method, by controlling the PH value range of the solution, the pure Co(OH)2, Cu(OH)2 and Al(OH)3 can be obtained through fractional precipitation. The method has the characteristics of simple process, less equipment investment, low recycle cost and high recycle efficiency, and cannot cause secondary pollution in the recycle process.

Description

technical field [0001] The invention relates to a method for recovering metal components such as metal cobalt, copper and aluminum from waste lithium ion batteries. Background technique [0002] The composition of the lithium-ion battery cell is that the positive pole is lithium cobalt oxide, the negative pole is graphite, and the electrolyte is dissolved with LiPF 6 organic solvent, the separator is a polypropylene or polyethylene film, the shell is an aluminum shell, and the positive and negative current collectors are metal aluminum and copper respectively. In order to ensure normal use, it is necessary to install a protective plate and a casing on the battery cell to form a lithium-ion battery. A large number of lithium-ion batteries are used in electronic products such as mobile phones, digital cameras, digital cameras, MP3, MP4, PDA, etc., and the replacement speed of electronic products is very fast, so that the supporting lithium-ion batteries are replaced with the ...

AI Technical Summary

Problems solved by technology

NMP is not only expensive, but also has certain toxicity, especially when NMP dissolves the binder polyvinylidene fluoride (PVDF) in the positive and negative electrodes, the viscosity increases and the filtration in the subsequent process becomes very difficult, while PVDF dissolved NMP is also difficult to recycle and reuse, causing pollution, high recycling cost and low efficiency. Currently, it only stays in the laboratory stage and is difficult to promote on a large scale.