中文摘要：

以氧化铁为铁源。通过简单的固相碳热法制备LiFePO。一MwCNTs复合正极粉体材料．利用XRD和SEM表征LiFeP04一MwCNTs复合材料的结构和表面形貌．利用EIS、CV和充放电测试实验测量LiFe—PO。一MWCNTs复合材料的电化学性能．XRD结果显示复合材料为橄榄石型的磷酸铁锂纯相，多壁碳管在正极材料中将颗粒相连．增加导电面积．形成三维网络结构．为颗粒之间提供附加的导电通道．通过添加质量分数为5％的多壁碳管的方法对LiFeP04正极材料导电通道进行改善．在0．5c充放电速率下首次放电比容量可以达到151．6mAh／g．充放电50次后，放电比容量还能保持在145．5mAh／g．在1C充放电速率下比容量保持在140mAh／g．2C时比容量保持在130mAh／g．随着充放电速率的增加．锂离子电池的性能也更加优越．

英文摘要：

LiFePO4-MWCNTs cathode materials were synthesized by a simple solid- states carbothermal reduction （CTR） using Fe203 as raw material. The structures and mor- phological performances of LiFePO4-MWCNTs composites were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The electrochemical properties for LiFePO4-MWCNTs composites were measured by electrochemical impedance spec- troscopy （EIS） and charge/discharge experiments. The XRD and SEM result shows that the samples have an olivine-type phase, MWCNTs connect active particles to increase the super- ficial area with particles to form a three-dimensional network structure. LiFePO4-MWCNTs synthesized at 800 C for 20 h with glucose as carbon source shows the electrochemical performance with an initial discharge specific capacity of 151.6 mAh/g at 0.5 C rate and remains to be 145.5 mAh/g after 50 cycles, keep 140 mAh/g at 1 C and 130 mAh/g at 2 C. Along with the increase of the charge and discharge rate, the performance of Lithium ion battery becomes better.