Recovery method of positive electrode material of waste ternary lithium ion battery

Abstract

The invention discloses a recovery method of a positive electrode material of a waste ternary lithium ion battery. The method specifically comprises the steps: leaching the ternary material in the waste ternary lithium ion battery by adopting acid and a reducing agent, adding a precipitant and a complexing agent into the leachate to obtain a nickel-cobalt-manganese-lithium coprecipitation precursor, and calcining the precursor at high temperature to obtain the nickel-cobalt-lithium manganate ternary material. According to the method, nickel, cobalt, manganese and lithium in the positive electrode material of the waste ternary battery are recycled at the same time through a one-step coprecipitation method, valuable metals in the positive electrode material of the waste ternary lithium ion battery are efficiently recycled, meanwhile, the regenerated ternary positive electrode material can be obtained, and the obtained regenerated ternary positive electrode material has good electrochemical performance. According to the recycling process, the step of separating lithium from nickel, cobalt and manganese and the step of preparing lithium salt and nickel, cobalt and manganese precursorsare omitted, the process is greatly simplified, and the recycling cost is remarkably reduced.

Description

technical field [0001] The invention relates to recycling and processing of waste lithium ion batteries, in particular to a method for recycling positive electrode materials of waste and old ternary lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electronic devices such as portable electronic devices, pure electric vehicles and hybrid electric vehicles due to their high energy density, long cycle life, and no memory effect. Among them, nickel-cobalt lithium manganese oxide batteries (ternary Lithium-ion batteries) are widely used in electric vehicles due to their high energy density. With the mass production and widespread use of lithium-ion batteries, the disposal of used batteries has also increased. If used batteries cannot be disposed of in a timely and reasonable manner, it will not only cause a waste of resources but also cause environmental pollution. Therefore, it is very important to recycle waste lithium-ion batteries...

AI Technical Summary

Problems solved by technology

[0003] At present, the method of recycling the positive electrode material of the ternary lithium-ion battery is mainly based on the wet process. The valuable metals in the positive electrode material are transferred to the solution in the form of ions by acid leaching or alkali leaching, and then separated, purified, and multi-step Salts or oxides such as nickel sulfate, cobalt sulfate, manganese sulfate, lithium carbonate, cobalt oxide, and nickel oxide can be obtained by precipitation, but this recovery process is complicated, costly, and recovery rate is low

In addition, in the prior art, nickel-cobalt-manganese-lithium and other elements in the waste ternary lithium-ion battery are used to re-prepare the positive electrode material of the ternary lithium-ion battery, and the nickel-cobalt-manganese and lithium in the leaching solution must be separated to prepare nickel-cobalt-manganese hydroxide respectively. precursors and lithium carbonate or lithium hydroxide, and then synthesize ternary materials, the process is longer

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