Method for regenerating lithium iron phosphate positive electrode material of battery electrolyte

By using electrolyte as a lithium source, reducing agent, and carbon conductive agent at high temperatures, the regeneration of waste lithium iron phosphate cathode materials has been achieved, solving the problems of high recycling costs and unused electrolyte in existing technologies, improving material performance, and reducing regeneration costs.

CN119581705BActive Publication Date: 2026-07-10XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Filing Date
2024-11-14
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies increase recycling costs by adding additional lithium sources, reducing agents, and carbon sources when recycling used lithium iron phosphate batteries, and there is a lack of solutions for reusing the electrolyte.

Method used

By contacting the electrolyte with waste lithium iron phosphate cathode material at high temperature, and using the electrolyte as a lithium source, reducing agent and carbon conductive agent, the waste lithium iron phosphate cathode material is regenerated. This includes high-temperature calcination and electrolyte atomization contact steps.

Benefits of technology

This technology enables the regeneration of waste lithium iron phosphate cathode materials, reduces regeneration costs, provides a reuse pathway for electrolytes, and improves the electrochemical performance of cathode materials.

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Abstract

This invention discloses a method for regenerating lithium iron phosphate cathode materials using battery electrolyte. The method involves pre-treating spent lithium iron phosphate batteries to obtain spent lithium iron phosphate cathode sheets and electrolyte; calcining the spent lithium iron phosphate cathode sheets at high temperature to remove the binder and then grinding them to obtain spent lithium iron phosphate cathode powder; pressing the obtained cathode powder into thin sheets using a tablet press and placing them in a sleeve; during the regeneration process, the electrolyte is sprayed into a tube furnace through an atomizer to contact the cathode material, thus regenerating the lithium iron phosphate cathode material. This invention utilizes the spent battery electrolyte, which simultaneously acts as a lithium salt, reducing agent, and carbon source during high-temperature processing to regenerate the spent lithium iron phosphate cathode material. This achieves a "three birds with one stone" effect. This invention not only successfully regenerates spent lithium iron phosphate cathode material but also provides a feasible approach for electrolyte reuse, representing a green and efficient technology.
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