Abstract
Pure LiFePO 4 was synthesized by heating an amorphous LiFePO 4. The amorphous LiFePO 4 obtained through lithiation of FePO 4· xH 2O by using oxalic acid as a novel reducing agent at room temperature. FePO 4· xH 2O was prepared through co-precipitation by employing FeSO 4·7H 2O and H 3PO 4 as raw materials. X-ray diffraction (XRD), scanning electron microscopy (SEM) observations showed that LiFePO 4 composites with fine particle sizes between 100 nm and 200 nm, and with homogenous sizes distribution. The electrochemical performance of LiFePO 4 powder synthesized at 500 °C were evaluated using coin cells by galvanostatic charge/discharge. The synthesized LiFePO 4 composites showed a high electrochemical capacity of 166 mAh g −1 at the 0.1 C rate, and possessed a favorable capacity cycling maintenance at the 0.1 C, 0.2 C, 0.5 C and 1 C rate.
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