Method for recycling spent battery cathodes

CN122246330APending Publication Date: 2026-06-19JIANGSU XINLIYUAN TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU XINLIYUAN TECHNOLOGY CO LTD
Filing Date
2024-12-18
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing battery recycling processes, lithium recovery rates are low, nickel and cobalt recovery rates are not high, and hydrometallurgical processes use large amounts of acids, alkalis, or extraction solutions, leading to environmental pollution and resource waste.

Method used

The positive electrode material of the waste battery is heat-treated with carbon monoxide and/or carbon powder, followed by water washing or acid washing to separate nickel, cobalt, manganese and lithium. The solid filter material is dissolved with sulfuric acid and then electrolyzed. Impurities are removed by combining alkaline solution and the addition of oxides, thereby reducing the use of sulfuric acid.

Benefits of technology

It achieves efficient lithium recovery and high-purity separation of nickel and cobalt, reduces the amount of sulfuric acid used, simplifies the processing flow, and reduces resource consumption and environmental pollution.

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Abstract

The recycling method provided in this application first recovers lithium from the positive electrode of waste batteries, thereby achieving liquid-solid separation of lithium and nickel-cobalt-manganese. Then, the solid filter material containing nickel-cobalt-manganese metal (Me) and its oxide (MeO) generated during reduction is dissolved in sulfuric acid and further purified to obtain a purified second solution containing MeSO4. A slurry is prepared using a first alkaline solution, with the solid phase containing Me(OH)2 and the liquid phase containing MeSO4. The slurry is then electrolyzed. No acid is consumed during electrolysis, and the electrolysis process can be continued by replenishing Me(OH)2, thus achieving cyclical recycling. Since sulfuric acid is generated during electrolysis, no additional sulfuric acid needs to be added throughout the recycling process, significantly reducing sulfuric acid consumption compared to traditional processes. Furthermore, the process is simple and economically efficient.
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