Solid Chemical Reaction by Microwave Heating for the Synthesis of LiFePO_4 Cathode Material

概要

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LiFePO_4 has been synthesized using FeC_2O_4・2H_2O, LiOH・H_2O and NH_4H_2PO_4 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℃ as well as added acetylene black were well microwave absorbers. Single phase olivin-type LiFePO_4 with uniform and fine particle sizez was successfully synthesized by microwave heating at 350℃ in 15 min. The LiFePO_4 cathode materials thus obtained had a higher discharge capacity and better cycle performance than those of the LiFePO_4 sample by a conventional solid-state reaction.
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