A method for preparing a manganese iron phosphate precursor and a positive electrode material thereof by using a short process of waste lithium ion batteries

CN122144678APending Publication Date: 2026-06-05KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Filing Date
2026-02-12
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies struggle to precisely synthesize high-performance manganese iron phosphate precursors from manganese and iron elements in waste lithium-ion batteries in one step under mild conditions. The process is lengthy, resource utilization is low, and safety is difficult to control.

Method used

A short-process method involving sulfation roasting, compound acid leaching, valence state control, and controlled crystallization is adopted. Through sulfation roasting, compound acid dissolution, oxidant oxidation, and alkaline regulator precipitation, manganese and iron elements are efficiently and synergistically recovered and directly converted into manganese iron phosphate precursor.

Benefits of technology

It achieves process simplification, reduced equipment investment and operating costs, and produces precursors with high purity, uniform composition and regular morphology, directly remanufacturing waste battery materials into high-end materials, which are suitable for large-scale production.

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Abstract

The present application relates to a kind of short process preparation of phosphoric acid manganese iron precursor and its anode material using waste lithium ion battery, it is related to waste lithium battery recycling and anode material technical field.The present application uses waste LiMn2O4 and waste LiFePO4 as raw material, innovatively using "sulfation roasting-complex acid leaching-valuation control-controlling crystallization" integrated process, simultaneously realize the efficient leaching of manganese, iron and accurate valence control, directly prepare high-purity (≥98%), primary particle size <50nm, secondary particle D50=1~8 μm phosphoric acid manganese iron precursor (Mn 1‑x Fe x PO4·H2O, 0.01≤x≤0.99).The present application has the advantages of process flow section, low energy consumption, less waste, product added value is high, and industrialization broad prospect.
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