A method for preferentially extracting lithium from waste lithium batteries by using the ore pulp electrolysis technology

By using slurry electrolysis technology to process waste lithium batteries, and selectively extracting lithium ions through electrochemical oxidation and electric field migration, the complexity and high cost of existing technologies are solved, achieving efficient and economical lithium recycling.

CN116891951BActive Publication Date: 2026-05-05NORTH CHINA UNIVERSITY OF TECHNOLOGY +1
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Patent Information

Application Number
CN202310617201.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-29
Publication Date
2026-05-05
Estimated Expiration
2043-05-29

AI Technical Summary

Technical Problem

Existing lithium extraction technologies are complex, require additional reagents, are costly, and have low overall lithium recovery rates.

Method used

Using slurry electrolysis technology, after discharging, dismantling, calcining and stirring waste lithium batteries, positive electrode powder or a mixture of positive and negative electrode powder is added to dilute sulfuric acid for electrolysis. By utilizing electrochemical oxidation and electric field migration, lithium ions are selectively extracted, avoiding the leaching of other valuable elements.

Benefits of technology

It achieves efficient lithium extraction under low-acid conditions, has a friendly operating environment, is simple to operate, has high economic benefits, and is suitable for large-scale industrial production.

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Abstract

This invention discloses a method for preferentially extracting lithium from spent lithium batteries using slurry electrolysis technology. The method includes: sequentially discharging and disassembling spent lithium batteries to obtain positive electrode sheets or a mixture of positive and negative electrode sheets; calcining the positive electrode sheets or the mixture of positive and negative electrode sheets, and sieving to obtain positive electrode powder or a mixture of positive and negative electrode powder; adding the positive electrode powder or the mixture of positive and negative electrode powder to dilute sulfuric acid and stirring to obtain a slurry; transferring the slurry to an electrolytic cell, electrolyzing the slurry, and filtering to obtain a lithium-ion-rich solution. This method, by adjusting the slurry of spent lithium batteries and adding a suitable electric field, utilizes electrochemical oxidation and electric field migration to promote the migration of lithium ions from the crystal structure of the positive electrode material into the solution, while simultaneously oxidizing and dissolving the metallic lithium deposited on the negative electrode material. This achieves selective lithium extraction under low-acid conditions, while preventing the leaching of other valuable elements besides lithium, thus achieving the goal of preferential lithium extraction.
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