近日，清华大学吕阳成团队实现了微反应器高温氧化沉淀法合成纳米FePO₄颗粒。相关论文于2025年10月23日发表在《颗粒学报》杂志上。

研究组提出了一种高温氧化沉淀法合成高纯度纳米磷酸铁的新方法。他们系统地研究了反应温度对磷酸铁产品及其浆料性能的影响。研究发现，高温沉淀法制备的FePO₄由非晶纳米颗粒组成，粒径分布在30 nm左右。提高反应温度不影响颗粒的纯度和晶体结构，但降低了料浆的粘度和固含量，有利于在后续生产工艺中提高固液分离效率。

通过FTIR、XPS和ICP-OES对不同反应温度下得到的产物进行表征，发现温度升高降低了磷酸铁颗粒表面羟基的含量，减弱了金属离子杂质在颗粒表面的吸附和颗粒间的相互作用。以高温氧化沉淀法得到的纳米FePO₄为前驱体合成的LiFePO₄@C材料具有良好的倍率性能（137.1 mAh g^-1, 5℃）。这种高温氧化沉淀法可以实现可控、连续和易于扩展的纳米FePO₄生产。

附：英文原文

Title: Synthesis of nano FePO4 particles via high-temperature oxidative precipitation in microreactor

Author: Yangcheng Lu

Issue&Volume: 2025/10/23

Abstract: A novel high temperature oxidation precipitation method for synthesizing high-purity nano-sized ferric phosphate was proposed. We systematically investigated the impact of reaction temperature on the properties of the ferric phosphate product and its slurry. The study found that the FePO4 obtained by the high-temperature precipitation method consisted of amorphous nanoparticles with a narrow size distribution around 30 nm. Increasing the reaction temperature did not affect the purity or crystal structure of the particles, but it reduced the viscosity and solid content of the slurry, beneficial for improving the solid-liquid separation efficiency in subsequent production processes. Characterization of products obtained at different reaction temperatures using FTIR, XPS, and ICP-OES revealed that elevated temperatures decreased the content of hydroxyl groups on the surface of the ferric phosphate particles, weakening the adsorption of metal ion impurities on the particle surface and the interaction between particles. The LiFePO4@C material synthesized using the nano FePO4 product obtained by the high-temperature oxidative precipitation method as a precursor exhibited good rate performance (137.1 mAh g-1 at 5 C). This high-temperature oxidative precipitation method might enable controllable, continuous, and easily scalable production of nano-sized FePO4 production.

DOI: 10.1016/j.partic.2025.10.007

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200125002743