Copper-removed waste lithium iron phosphate material, modified lithium manganese iron phosphate and preparation method of modified lithium manganese iron phosphate

By using oxidation complexation treatment and pulsed microwave heat treatment under weak acid conditions, combined with manganese source and transition metal carbides, the problems of removing copper impurities and manganese doping in waste lithium iron phosphate were solved, achieving a high-efficiency, low-energy material upgrade and improving the conductivity and stability of lithium manganese iron phosphate.

CN122079110APending Publication Date: 2026-05-26GEM CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GEM CO LTD
Filing Date
2026-03-31
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies struggle to efficiently and environmentally remove copper impurities from waste lithium iron phosphate while preserving the main iron/phosphorus elements, and to achieve uniform incorporation of manganese and improved material conductivity at low temperatures.

Method used

By treating waste lithium iron phosphate under weak acid conditions with oxidants and complexing agents, combined with pulsed microwave and heat treatment, the directional dissolution and separation of copper impurities are achieved. Furthermore, manganese sources and transition metal carbides are introduced to construct a conductive network and improve material performance.

Benefits of technology

It effectively reduces the risk of copper impurity residue, improves the conductivity and structural stability of regenerated lithium manganese iron phosphate, and reduces process energy consumption and waste liquid generation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a decoppered waste lithium iron phosphate material, modified lithium manganese iron phosphate and a preparation method thereof.The preparation method of the decoppered waste lithium iron phosphate material comprises the step that waste lithium iron phosphate black powder, an oxidizing agent and a complexing agent make contact in a liquid environment with the pH being 3.5-4.5, and enabling copper impurities in the waste lithium iron phosphate black powder to react and enter a liquid phase, and carrying out solid-liquid separation to obtain a copper-removed waste lithium iron phosphate material. According to the preparation method of the decoppered waste lithium iron phosphate material provided by the invention, the removal efficiency of copper impurities in waste lithium iron phosphate can be improved in a green and efficient manner, and the improvement of the performance of upgraded and regenerated lithium manganese iron phosphate is facilitated.
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