中文摘要：

本文采用碳热还原法，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℃烧结制备了LiFePO。／C复合材料，方法重现性好且易规模化生产．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600oC烧结10h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60～100nm．包覆LiFePO。晶粒的碳层厚度为2nm左右，碳含量为5％（bymass）．材料的振实密度高达1．3g·cm^-3，在0．2C倍率下首次放电比容量为162mAh·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105mAh·g^-1，10C倍率下500周期循环，其比容量仍有81mAh·g^-1.

英文摘要：

The LiFePO4/C composite electrode material was synthesized by a moderate in situ carbothermal reduction method at 600 ℃ using FeC13 .6H20, LiOH. H20 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 LiFePOJC 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 LiFePOJC 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 105mAh·g^-1 at 0.2C, 0.5C, 1C, 2C, 5C and 10C rates, respectively. Remarkably, even after 500 cy-cles at 10C, the capacity of 81 mAh·g^-1 could be obtained.