Method for preparing iron cobaltate diaphragm based on waste lithium iron phosphate positive electrode material

By recycling iron phosphate from waste lithium iron phosphate batteries and preparing iron cobalt acid separator materials, the problems of unused waste lithium ion battery resources and degraded lithium sulfur battery performance are solved, and resource recycling and battery performance are improved.

CN119905705APending Publication Date: 2025-04-29UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Application Number
CN202510047815.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-13
Publication Date
2025-04-29

AI Technical Summary

Technical Problem

The valuable metal resources in waste lithium-ion batteries have not been effectively recycled and reused, resulting in waste of resources and environmental pollution. At the same time, lithium-sulfur batteries face capacity attenuation and degradation of cycling performance caused by polysulfide shuttle effect in practical applications.

Method used

Lithium iron phosphate is recovered from the positive electrode material of waste lithium iron phosphate battery by using the organic acid method, converted to iron phosphate, and the iron cobalt acid separator material is prepared using this material to improve the circulation performance and stability of lithium sulfur batteries.

Benefits of technology

It realizes the effective recycling of waste battery materials, reduces environmental pollution, improves the sustainability of battery materials, and provides excellent separator materials for lithium-sulfur batteries, improving its energy density and circulation stability.

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Abstract

The invention belongs to the technical field of battery material recovery and reutilization, and particularly relates to a method for preparing an iron cobaltate diaphragm based on a waste lithium iron phosphate positive electrode material and application of the iron cobaltate diaphragm. Then leaching, filtering and washing to obtain a solid product lithium iron phosphate, and aging, centrifugally washing and drying the lithium iron phosphate, and heating in a nitrogen environment to obtain an iron cobaltate product; and finally, adding conductive carbon black and polyvinylidene fluoride into iron cobaltate to prepare the iron cobaltate diaphragm. According to the method, the lithium iron phosphate LiFePO4 is recycled from the positive electrode material of the waste lithium iron phosphate battery by adopting an organic acid method, and is converted into the iron phosphate FePO4 to prepare the iron cobaltate diaphragm material, so that the effective recycling of resources is realized, the environmental pollution is reduced, and the sustainability of the battery material is improved.
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