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中文摘要：
采用高温固相合成法二次灼烧工艺制备锂离子电池正极复合材料LiFePO4／C。经300℃和650℃二次灼烧，得到了从纳米到亚微米尺寸的LiFePO4和LiFePO4／C复合材料。X射线衍射（XRD）结果表明，所得到的LiFePO4和LiFePO4／C样品具有单一的橄榄石型晶体结构，且具高纯度。在多种碳源（如乙炔黑、Vulcan XC-72碳黑、鳞状石墨、各向异性石墨和葡萄糖）制备的LiFePO4／C复合材料中，以葡萄糖为碳源合成的样品具有最好的电化学性能。在电池工作温度由室温提高到40℃时，由于复合材料的电子电导率增大和锂离子在材料中的扩散速度加快，电池的充放电循环性能明显提高。
英文摘要：
LiFePO4/C composites, as a kind of positive electrode materials in Li-ion batteries, were prepared by high temperature solid-state reactions. LiFePO4 and LiFePO4/C particles in the size from nanometer to submicrometer were obtained through pretreatment at 300℃ and calcination at 650℃. X-ray diffraction （XRD） analysis showed that the prepared LiFePO4 and LiFePO4/C composites had a structure of olive-type phase and with a high degree of purity. Among LiFePO4 and LiFePO4/C composites prepared with different carbon materials, such as the acetylene black, Vulcan XC-72 carbon black, scalelike graphite, anisotropic graphite powders and glucose, LiFePO4/C samples prepared with glucose exhibited the best recharge-discharge cyclic performance.The cyclic performance was improved while the operation temperature was increased from room temperature to 40℃. This is because of the highe electronic conductivity and the more rapid diffusion rate of Li＋ in the LiFePO4/C structure.
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