Synthesis and Electrochemical Properties of LiFePO_4 Cathode Material

The olive-type LiFePO4 was synthesized via sintering the amorphous LiFePO4 obtained by chemical reduction and lithiation of FePO4, using VC as reducer and lithium acetate as lithium source in alcohol solution. The influences of sintering conditions on the physical and electrochemical properties of resulting LiFePO4 were investigated. XRD and SEM tests show that increasing the sintering temperature and time leads to higher crystallinity, but to a larger particle size. The electrochemical property of LiFePO4 sintered at 600℃for 2h is the best, its initial discharge capacity at 0.1C rate can reach 159mAh·g-1, its capacity after 50 charge-discharge cycles is nearly no decay.