Process for the preparation of ferrous oxalate

By controlling the reaction conditions of liquid and solid oxalic acid, ferrous oxalate with both small and large particle sizes was prepared, solving the problem of narrow particle size range and improving the compaction density and electrochemical performance of lithium iron phosphate.

CN122127218APending Publication Date: 2026-06-02湖北金泉新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
湖北金泉新材料有限公司
Filing Date
2026-02-04
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

The particle size range of ferrous oxalate in the existing technology is relatively narrow, which makes it difficult to improve the compaction density of lithium iron phosphate.

Method used

Liquid oxalic acid is reacted with ferrous ions to form tiny ferrous oxalate seed crystals. The amount and rate of addition are controlled to reduce local supersaturation and promote the growth of large-diameter crystals. Subsequently, solid oxalic acid is used to increase local supersaturation, generate a large number of crystal nuclei and restrict their growth space, thus preparing ferrous oxalate with both small and large diameters.

Benefits of technology

It broadens the particle size range of ferrous oxalate crystals and improves the compaction density and discharge capacity of lithium iron phosphate.

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Abstract

A method for preparing ferrous oxalate includes: dissolving an iron source and performing a reduction operation to obtain a first solution; adding a first liquid oxalic acid to the first solution and mixing and reacting to obtain a second solution; adding solid oxalic acid to the second solution and mixing and reacting to obtain a third solution containing a first reaction product; and removing impurities from the first reaction product to obtain ferrous oxalate. The ferrous oxalate has particle sizes including D10, D50, and D90, and its uniformity coefficient is (D90-D10) / D50, satisfying: 20μm≤D50≤60μm, 1.8≤(D90-D10) / D50≤8. This method can prepare both small- and large-particle-size ferrous oxalate, thus broadening the particle size range of ferrous oxalate crystals.
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