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Solid Chemical Reaction by Microwave Heating for the Synthesis of LiFePO4 Cathode Material

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  • UEMATSU Kazuyoshi
    Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University
  • OCHIAI Ayumi
    Graduate School of Science and Technology, Niigata University
  • TODA Kenji
    Graduate School of Science and Technology, Niigata University
  • SATO Mineo
    Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University

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Abstract

LiFePO4 has been synthesized using FeC2O4•2H2O, LiOH•H2O and NH4H2PO4 as raw materials by a temperature controllable microwave heating oven. The products were characterized by X-ray diffraction, scanning electron microscope and electrochemical methods. Measurement of dielectric properties of individual raw materials and products at a constant microwave frequency revealed that the starting mixture preheated at 320°C as well as added acetylene black were well microwave absorbers. Single phase olivin-type LiFePO4 with uniform and fine particle sizes was successfully synthesized by microwave heating at 350°C in 15 min. The LiFePO4 cathode materials thus obtained had a higher discharge capacity and better cycle performance than those of the LiFePO4 sample by a conventional solid-state reaction.<br>

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