Abstract: In order to prepare spherical LiFePO₄ as cathode material for Lithium ion battery,the micron-grade spherical Li₃PO₄ powders as LiFePO₄ precursor were synthesized by ultrasonic waves using Tx-100 as the surfactant.The components of Li₃PO₄ were confirmed by X-ray diffraction.The optimum condition of synthesizing spherical Li₃PO₄ powders was obtained by researching the effects of the diversified factors on the appearance of Li₃PO₄ powders.The condition was as follws: the reaction temperature was 35 ℃,Li⁺ concentration was 0.6 mol/L,the mass fraction of Tx-100 was 10%,and the reaction time was 5 min.