Method for short-process regeneration of waste lithium iron phosphate

Through a short-process regeneration method, the reaction of oxalic acid solution and lithium iron phosphate positive electrode powder is used, combined with ball milling, sand milling and spray drying processes, the lithium iron phosphate positive electrode precursor material is directly obtained, solving the problems of lengthy existing processes and impurities introduction, improving electrochemical performance and reducing costs.

CN119750532APending Publication Date: 2025-04-04CHANGZHOU DAOBO INTELLIGENT TECHNOLOGY CO LTD +1
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Patent Information

Application Number
CN202411966251.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The existing lithium iron phosphate recycling process is too lengthy, and impurity metal ions are easily introduced during the leaching process, which reduces the recovery quality.

Method used

By using a short-process regeneration method, lithium iron phosphate positive electrode powder is mixed with oxalic acid solution to leach the solid-liquid ratio, temperature and time are controlled, and lithium salt, iron source, phosphorus source and organic carbon source are added, ball milling, sand milling and spray drying are carried out to obtain lithium iron phosphate positive electrode precursor material, and the positive electrode material is obtained by baking.

Benefits of technology

The process steps are greatly reduced, the introduction of impurity metal ions is avoided, the electrochemical performance of lithium iron phosphate positive electrode material is improved, and the recycling cost is reduced.

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Abstract

The invention belongs to the field of lithium battery material recovery, and particularly relates to a short-process regeneration method of waste lithium iron phosphate, which comprises the following steps: S1, roasting a lithium iron phosphate positive plate to be recovered in an inert atmosphere to obtain lithium iron phosphate positive powder; s2, mixing and leaching the lithium iron phosphate positive electrode powder in the step S1 and an oxalic acid solution to obtain a solid-liquid mixture containing a leaching solution A and leaching residues B; s3, respectively adding a lithium salt, an iron source, a phosphorus source and an organic carbon source into the solid-liquid mixture obtained in the step S2, so that the molar ratio of Li to Fe to P in the solid-liquid mixture is (1-1.05): 1: (1-1.05); s4, carrying out ball milling, sanding and spray drying on the solid-liquid mixture in the step S3 to obtain a lithium iron phosphate positive electrode precursor material; and S5, roasting the lithium iron phosphate precursor material in the step 4 in an inert atmosphere to obtain the lithium iron phosphate positive electrode material.
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