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Volume 107
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Synthesis of nano FePO4 particles via high-temperature oxidative precipitation in microreactor
Jing Lao, Zihan Mu, Yangcheng Lu *
State Key Laboratory of Chemical Engineering and Low-Carbon Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
10.1016/j.partic.2025.10.007
Volume 107, Received 3 August 2025, Revised 15 September 2025, Accepted 4 October 2025, Available online 23 October 2025, Version of Record 27 October 2025., Pages 166-175
December 2025
E-mail: luyc@tsinghua.edu.cn
Highlights

• Established a microflow system for high-temperature precipitation of nano FePO4.

• Proposed a novel high temperature oxidation precipitation method for synthesizing high-purity nano-sized ferric phosphate.

• Illustrated effect of high temperature on surface hydroxyl groups of particles and properties of the slurry.

• The as-prepared LiFePO4@C material exhibited excellent rate performance (137.1 mA h g−1 at 5 C).


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.

Graphical abstract
Keywords
Microreactor; Iron phosphate nanoparticles; High temperature oxidation precipitation; Lithium iron phosphate
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