Synthesis and electrochemical performance of LiMnPO4 /C composites cathode materials

LiMnPO/C composites were synthesized via solid-state reaction with different carbon sources: sucrose, citric acid and oxalic acid. The sam- ples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical performance test. The results of XRD reveal that carbon coating has no effect on the phase of LiMnPO. The LiMnPO/C synthesized at 600 °C with citric acid as carbon source shows an initial discharge capacity of 117.8 mA·hg~-1 at 0.05 C rate. After 30 cycles, the capacity remains 98.2 mAh·g~-1 . The improved electrochemical properties of LiMnPO/C is attributed to the decomposition of organic acid during the sintering process.