Method for separating positive electrode active material and current collector of waste lithium battery

Abstract

The invention discloses a method for separating a positive electrode active material and a current collector of a waste lithium battery. The method comprises the steps of (1) disassembling the waste lithium battery after discharging, taking out a positive plate, and cleaning the positive plate; (2) putting the cleaned positive plate into a high-concentration strong alkali solution to be fully soaked so as to enable an aluminum foil to be basically separated from the positive electrode active material; (3) increasing mechanical stirring or water flow washing effect to promote complete separation of the positive electrode active material and the aluminum foil current collector, sinking the positive electrode active material into the bottom of the solution, and floating the aluminum foil current collector on the solution; and (4) filtering the aluminum foil floating on the upper part of the solution by using a large-mesh screen, washing with clear water, collecting the aluminum foil, collecting the reacted solution to obtain the positive electrode active material, and recycling the alkali liquor. The method provided by the invention can realize rapid separation of the positive electrode active material and the aluminum foil, and reduces the whole recovery cost while simplifying the separation process.

Description

technical field [0001] The invention relates to a method for separating positive electrode active materials and current collectors of waste lithium batteries, and belongs to the technical field of battery recycling. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long life, low self-discharge rate, no memory effect, good cycle performance, and wide operating temperature range. They are widely used in portable electronic devices such as mobile phones, mobile power supplies, and notebooks. Especially in recent years, the strong demand for lithium-ion batteries used in the field of power batteries has made the production and consumption of lithium-ion batteries reach an unprecedented scale. [0003] The mass production and consumption of lithium-ion batteries lead to the retirement or scrapping of a large number of lithium-ion batteries in the market every year. With the urgent need for environmental protection and clean energy i...

AI Technical Summary

Problems solved by technology

This method is relatively easy to operate but consumes a large amount of strong alkali, and the recovery of aluminum foil dissolved in lye is difficult and the recovery cost increases