Method for simultaneously recycling positive electrode and negative electrode of lithium ion battery by adopting multi-layer electrode structure

Abstract

The invention provides a method for simultaneously recycling a positive electrode and a negative electrode of a lithium ion battery by adopting a multi-layer electrode structure. The method comprises the following steps: clamping a positive electrode material of the lithium ion battery with a conductive acid-resistant material to serve as the negative electrode of an electrode system; using the conductive acid-resistant material for clamping a negative electrode material of the lithium ion battery to serve as a positive electrode of the electrode system; adding a sulfuric acid solution into the electrode system; and carrying out solid-liquid separation after the reaction. According to the method, a series of pretreatment operations such as crushing, ultrasonic oscillation, roasting, screening, sorting, magnetic separation, primary grinding, positive electrode material sorting and secondary grinding on the positive electrode and the negative electrode of the lithium ion battery are not needed. Compared with a traditional method for recycling the positive electrode of the retired lithium ion battery through electrochemical reduction, the method is higher in economical efficiency, lower in cell pressure and better in effect, and the positive electrode material and the negative electrode material can be recycled at the same time.

Description

technical field [0001] The invention relates to the field of hazardous solid waste recycling, in particular to a method for simultaneously recycling the positive and negative electrodes of a lithium-ion battery by adopting a multilayer electrode structure. Background technique [0002] Lithium-ion batteries are a widely used clean energy storage device. With the development of the new energy vehicle industry in recent years, my country has now produced a large number of retired or used lithium-ion batteries, and with the popularity of electric vehicles in the future, the number of retired or used lithium-ion batteries will inevitably increase. It is estimated that by 2023, the annual scrapping of lithium-ion batteries will reach 101GWh, about 1.16 million tons per year. Decommissioned or waste lithium batteries contain a large amount of heavy metal elements and toxic and harmful substances. If they are not disposed of properly, they will pose a great threat to the natural e...

AI Technical Summary

Problems solved by technology

However, the traditional electrochemical reduction method causes the cell voltage (or cell voltage) to be too high and releases toxic gas due to the electro-oxidation of hydroxide or chloride ions in the anode reaction.

Moreover, the traditional electroreduction method can only recover the positive electrode material of the decommissioned lithium-ion battery, and cannot recover the positive electrode material and negative electrode material of the battery at the same time.

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