中文摘要：

以MnPO4．H2O、FePO4．2H2O为锰源和铁源，碳酸锂为锂源，葡萄糖为还原剂和碳源，采用高温碳热还原法，一步制备了改性的锂离子电池正极材料LiMnO45Fe0.55，PO4／C，并讨论了合成温度对材料的影响。采用X射线衍射、扫描电子显微镜和充放电测试等手段，对最终产物的物相、形貌和电化学性能进行了表征。结果表明：在500～600℃可以制备LiMn0. 45Fe0.55POdC固溶体材料。室温条件下充放电测试表明：600℃制备的LiMn0.45Fe0.55PO4／C具有最好的电化学性能，以15、75mA／g和150mA／g进行充放电，首次放电比容量分别为146．6、133．5mA‘IVg和124．1mAh／g，50次循环后容量保持率分别为97．5％、95．8％和97．6％；以300mA／g的电流密度放电，首次放电比容量达到94．4mA·h/g。材料在55℃时电化学性能明显优于25℃的结果。

英文摘要：

LiMn0.45Fe0.55 PO4/C, as a cathode material of lithium ion batteries, was prepared with MnPO4H20, FePO2H20 and Li2CO3 as precursors and glucose as both reducing agent and carbon source by one-step carbothermal reduction. The effect of synthesis temperature on the performances of LiMn0.asFe0.55PO4/C composites was investigated. The morphology and microstructure of the products were characterized by X-ray diffraction and scanning electron microscopy. The results show that LiMno.45Feo.55PO4/C solid solution can be prepared from 500 to 600 ℃. As an electrode material for rechargeable lithium ion batteries, the solid solution prepared at 600 ℃ exhibited a superior electrochemical performance. The initial discharge capacity of the sample reached 146.6, 133.5, 124.1 and 94.4 mA＇h/g at the current density of 15, 75, 150 mA/g and 300 mA/g, respectively. In addition, this sample showed a good cycle performance. After 50 cycles it retained 97.5%, 95.8% and 97.6% of the initial discharge capacity at 15, 75 mA/g and 150 mA/g, respectively. It was indicated that the electrochemical performance of the sample at 55℃ was better than that at 25 ℃.