Abstract
Ti 4+-mixed FePO 4· xH 2O precursor was prepared by co-precipitation method, with which Ti 4+ cations were added in the process of preparing FePO 4· xH 2O to pursue an effective and homogenous doping way. Ti 4+-doped LiFePO 4 was prepared by an ambient-reduction and post-sintering method using the as-prepared precursor, Li 2CO 3 and oxalic acid as raw materials. The samples were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), electrochemical impedance spectroscopy (EIS), and electrochemical charge/discharge test. Effects of Ti 4+-doping and sintering temperature on the physical and electrochemical performance of LiFePO 4 powders were investigated. It is noted that Ti 4+-doping can improve the electrochemical performance of LiFePO 4 remarkably. The Ti 4+-doped sample sintered at 600 °C delivers an initial discharge capacity of 150, 130 and 125 mA·h/g with 0.1 C, 1 C and 2 C rates, respectively, without fading after 40 cycles.
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