Recycling method of retired lithium ion battery positive electrode materials

Abstract

The invention discloses a recycling method of retired lithium ion battery positive electrode materials. The recycling method includes the following steps that firstly, retired lithium ion batteries are taken and subjected to discharging processing, shells are peeled off, the positive electrode materials of the lithium ion batteries are smashed after electrolyte in the batteries is washed away, andmixed powder is obtained; secondly, the mixed powder is placed in a periodic pulsating high-gradient magnetic separator, the magnetic separation field intensity is set to be larger than 1.0 T, and magnetic objects are separated out; thirdly, the magnetic separation field intensity is regulated to 1.2 T to 1.7 T, and second-time magnetic separation is conducted on the mixed powder; fourthly, the magnetic separation field intensity is regulated to 1.5 T to 1.7 T, and third-time magnetic separation is conducted on the mixed powder; and fifthly, a valve is opened, the magnetic field is turned offafter non-magnetic substance powder is discharged, the magnetic objects are discharged, and weak-magnetism ultrafine powder and non-magnetic powder are obtained. By means of the recycling method, theweak-magnetism powder in lithium battery smashed materials can be effectively recycled, and the recycling productivity is increased; and meanwhile, the recycling method is simple in process, low in cost, free of pollution, good in practicability and suitable for popularization

Description

technical field [0001] The invention relates to the field of lithium ion battery recycling, in particular to a method for recycling anode materials of decommissioned lithium ion batteries. Background technique [0002] With the continuous advancement of science and technology, people's requirements for energy are getting higher and higher, especially with the rapid development of power vehicles, lithium-ion batteries are widely used because of their advantages such as high energy density, long life, reusability and no pollution. application; but correspondingly, how to effectively recycle and reuse lithium-ion batteries is of great significance. [0003] In the existing waste lithium-ion batteries, the main recovered materials are copper, aluminum, positive electrode sheet and negative electrode sheet, wherein the positive electrode sheet of lithium battery is the positive electrode material coated with aluminum foil, and the negative electrode sheet of lithium battery is th...

AI Technical Summary

Problems solved by technology

At present, the recycling process of lithium-ion batteries, whether it is the overall treatment or the individual treatment of the pole piece, has a crushing process. When the whole battery or a single pole piece is broken, there will be a phenomenon of the pole piece dropping, so it will cause the mixed powder component after crushing Due to the complicated situation, the mixed powder after crushing contains not only positive and negative electrode powder, but also steel materials worn by the crusher and shell wear materials; so how to deal with the mixed materials produced during the crushing process of lithium battery recycling At present, there is no particularly effective method. In theory, the valuable metals in it can be extracted by chemical methods, but there will be secondary pollutants, and the practicability is not high.