Recovery method for waste lithium-ion battery

Abstract

The invention discloses a recovery method for a waste lithium-ion battery. The method comprises the following steps of (1) carrying out buried discharge on a waste lithium-ion battery by using solid conductive powder; (2) crushing the waste lithium-ion battery and then carrying out anaerobic calcination at high temperature; (3) carrying out separation; (4) collecting the powder obtained in the step (3) for use; (5) adding positive electrode powder obtained in the step (4) into excessive NaOH and carrying out filtration; (6) adding residues obtained in the step (5) into a mixed solution of sulfuric acid and starch and filtering to obtain a solution; (7) removing impurities by adopting a fractional precipitation method; (8) adding aqueous ammonia into the solution treated in the step (7) andgenerating crystal from the solution; (9) adding excessive sodium carbonate into the solution obtained in the step (8) and washing and drying obtained sediments; and (10) sintering. The recovery method disclosed by the invention is high in recovery efficiency and low in cost; when the waste lithium-ion battery is discharged, a form of buried microdischarge is adopted, so that the recovery methodis safe, efficient and free of pollution.

Description

technical field [0001] The invention relates to the recycling of precious metals, in particular to a method for recycling waste lithium ion batteries. Background technique [0002] With the increasing demand for energy and the continuous development of the electric vehicle market, lithium-ion batteries have been favored by people for their safety, environmental protection and high specific energy. In 2016, the national new energy vehicle subsidy policy further clarified the high energy density requirements for the development of power batteries. Among the cathode materials of lithium-ion batteries, nickel-cobalt-manganese (NCM) ternary materials have higher specific capacity and become the lithium-ion battery for new energy vehicles. The mainstream direction of the development of ion power batteries, [0003] The continued normal production and sales of new energy vehicles has made the recycling of power batteries more and more prominent. The national and local governments ...

AI Technical Summary

Problems solved by technology

[0005] 1) The recovery process is extensive, and the comprehensive recovery efficiency for valuable metals is low;

[0006] 2) The discharge of pollutants is large and the treatment effect is poor during the recycling process;

[0007] 3) Recycled products are single and have low added value;

[0008] 4) The recycling network is mainly composed of small and medium-sized companies, and the technological level is not perfect, so it is difficult to effectively recycle;

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