Method for recovering cobalt in lithium cobalt oxide positive electrode material and method for regenerating lithium cobalt oxide

By using cysteine ​​as an extractant, cobalt and lithium in lithium cobalt oxide cathode materials can be efficiently extracted without the need for a reducing agent. This solves the problems of secondary pollution and harsh reaction conditions in the existing extraction process, and achieves efficient and environmentally friendly cobalt and lithium recycling.

CN120945222APending Publication Date: 2025-11-14SICHUAN AGRI UNIV
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Patent Information

Application Number
CN202511101651.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-07
Publication Date
2025-11-14

AI Technical Summary

Technical Problem

Existing hydrometallurgical technologies for recycling waste lithium cobalt oxide batteries suffer from secondary pollution, the need to add reducing agents, and stringent reaction conditions, making it difficult to efficiently extract valuable metals such as cobalt and lithium.

Method used

Cysteine ​​is used as the extraction agent, eliminating the need for a reducing agent. Co3+ is reduced to Co2+ by the -SH group in cysteine, which then forms a complex with Li+, achieving efficient extraction of lithium cobalt oxide cathode material. The cobalt precipitate is then separated by oxalic acid precipitation.

Benefits of technology

It achieves high-efficiency leaching of cobalt and lithium, reaching over 80%, without the need for high temperature and high pressure, thus avoiding secondary pollution, simplifying the operation process, and reducing costs.

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Abstract

The invention provides a method for recycling cobalt in a lithium cobalt oxide positive electrode material and a method for regenerating lithium cobalt oxide, and belongs to the technical field of resource recycling. According to the method, cysteine is adopted as an extracting agent,-SH in cysteine plays a reducing role to reduce Co < 3 + > into soluble Co < 2 + >, so that Li < + > is released from a collapsed structure of lithium cobalt oxide, and Co < 2 + > and Li < + > entering an extracting solution are respectively combined with-COOH and-NH2 of cysteine to form complexes and promote the reaction to be carried out; and the valuable metals in the waste lithium cobalt oxide positive electrode material can be efficiently reduced and extracted without adding a reducing agent. The result of the embodiment shows that when the recycling method is adopted, the extraction efficiency of Co and Li in the waste lithium cobalt oxide positive electrode material can reach 80% or above.
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