本文应用碳热还原法，以廉价的FeCl₃.6H₂O、LiOH.H₂O和NH₄H₂PO₄为原料，以淀粉为还原剂和碳源，经600 ^oC烧结制备了LiFePO₄/C复合材料，方法重现性好且易规模化. 采用X射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）测试材料结构，观察材料形貌. 结果表明，经600 ^oC烧结10 h所得产物具有纯相的橄榄石型晶体结构、良好的结晶性和规整的球状形貌，粒径为60 ~ 100 nm，包覆LiFePO4晶粒的碳层厚度为2 nm左右，碳含量为5%（by mass）. 材料的振实密度高达1.3 g.cm^-3，在0.2C倍率下首次放电比容量为162 mAh.g^-1，在0.5C、1C、2C、5C和10C倍率下首次放电比容量分别为143、135、127、116和105 mAh.g^-1，10C倍率下500周期循环，其比容量仍有81 mAh.g^-1.

The LiFePO₄/C composite electrode material was synthesized by a moderate in situ carbothermal reduction method at 600 °C using FeCl₃.6H₂O, LiOH.H₂O, and NH₄H₂PO₄ as starting materials, soluble starch sol as a carbon source and a reducing agent. This method is readily reproducible and possibly feasible to carry out large-scale synthesis. The structure and morphology of the LiFePO₄/C samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The synthesized LiFePO₄/C composite was in pure phase of olivine-type, shows highly crystalline and spherical morphology with the particle sizes in the range of 60 ~ 100 nm. The thickness of the carbon film could be as thin as about 2 nm for the isolated LiFePO₄/C particles, and the amount of carbon introduced into the composite was about 5% (by mass). The measured tap density of LiFePO₄/C composite was as high as 1.3 g.cm^-3 and the initial discharge capacities of LiFePO₄/C composite reached 162, 143, 135, 127, 116 and 105 mAh?g-1 at 0.2C, 0.5C, 1C, 2C, 5C and 10C rates, respectively. Remarkably, even after 500 cycles at 10C, the capacity of 81 mAh.g^-1 could be obtained.