Method for preparing lithium salt material by using waste lithium battery and product

By extracting active lithium using aromatic compound solution in decommissioned lithium batteries and performing redox reactions with lithium salt precursors, multifunctional lithium salt materials are directly synthesized, which solves the problems of high production costs of lithium salts and insufficient utilization of lithium resources in the prior art, and achieves efficient recycling and recycling of lithium resources.

CN119650929AActive Publication Date: 2025-03-18HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202510108159.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-23
Publication Date
2025-03-18
Estimated Expiration
2045-01-23

AI Technical Summary

Technical Problem

The prior art has high cost and complex processes in the production process of lithium salts, and cannot effectively utilize the lithium resources in retired lithium batteries, resulting in waste of lithium resources and environmental pollution.

Method used

Multifunctional lithium salt materials are directly synthesized by extracting active lithium from decommissioned lithium batteries using aromatic compound solution and undergoing redox reaction with lithium salt precursor. The method includes two steps: first extracting the active lithium in the negative electrode of the lithium battery in the aromatic compound solution to form a solution of the aromatic-active lithium complex; then fully mixing the solution with the lithium salt precursor to carry out a redox reaction to form a lithium salt material.

Benefits of technology

It realizes efficient recycling and recycling of lithium resources, reduces the production cost of lithium salts, simplifies process steps, improves the purity and yield of lithium salts, and reduces dependence on new lithium resources and environmental pollution.

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Abstract

The invention belongs to the field of lithium ion battery recovery, and particularly discloses a method for preparing a lithium salt material from waste lithium batteries and a product. The method comprises the following steps: S1, extracting active lithium in the negative electrode of the waste lithium battery by utilizing an aromatic hydrocarbon compound solution to obtain an aromatic hydrocarbon-active lithium compound solution; the aromatic hydrocarbon compound is C6-C30 benzene ring aromatic hydrocarbon or heterocyclic aromatic hydrocarbon containing at least one benzene ring, and the concentration of the aromatic hydrocarbon compound solution is 0.2 M-4 M; s2, mixing the solution of the aromatic hydrocarbon-active lithium compound with a lithium salt precursor, and performing oxidation-reduction reaction to obtain the lithium salt material, the molar mass of the effective component in the lithium salt precursor is 1-1.3 times that of active lithium in the aromatic hydrocarbon-active lithium compound. The lithium resource is recycled from the retired lithium battery, multiple different lithium salts are synthesized directly through chemical reaction, and the method has the advantages of simple process, low energy consumption, small environmental pollution and the like.
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