A rapid detection method for carbon-coated lithium iron phosphate based on water immersion iron dissolution kinetics

By immersing carbon-coated lithium iron phosphate in pure water and recording the change in iron content over time, the performance is evaluated using the peak occurrence time Tmax. This solves the problems of long detection cycles and inaccurate results in existing technologies, and achieves rapid and accurate evaluation.

CN122409760APending Publication Date: 2026-07-17XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
Filing Date
2026-05-27
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies make it difficult to quickly and accurately evaluate the integrity and hydrolysis resistance of carbon-coated lithium iron phosphate, leading to a decline in battery performance.

Method used

A method based on the kinetics of iron dissolution in water was adopted. Carbon-coated lithium iron phosphate was immersed in pure water, and the change of iron content over time was recorded. The performance of the carbon coating was evaluated by the peak occurrence time Tmax.

Benefits of technology

It enables rapid and accurate evaluation of the integrity and hydrolysis resistance of carbon-coated lithium iron phosphate, shortens the testing cycle by 90%, reduces costs by 90%, and the results are consistent with actual working conditions.

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Abstract

本发明涉及磷酸铁锂正极材料技术领域，尤其涉及一种基于水浸泡铁溶出动力学的碳包覆磷酸铁锂快速检测方法。包括以下步骤：去除待测LFP@C表面游离水分后、与超纯水混合，在密封环境下浸泡；浸泡过程中，按预设时间间隔取样，过滤后检测所得滤液中的可溶性铁含量；并以浸泡时间为横坐标、可溶性铁含量为纵坐标，绘制铁含量‑时间曲线；从曲线中提取可溶性铁含量最大值所对应的时间Tmax；基于Tmax评价所述LFP@C。本发明利用LFP@C在纯水浸泡体系中，可溶性铁含量呈现“先急剧升高、再急剧降低、后线性缓慢升高”的三段式动力学特征，通过Tmax评价待测LFP@C的碳包覆完整性和抗水解稳定性，具有快速、准确的优势。
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