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To improve the performance of battery cathode materials that consist of carbonaceous organic material,carbon coatings on lithium iron phosphate (LiFePO4/C) materials were synthesized by different carbon sources.LiFePO4/C was synthesized by a combination method of sol-gel and gas-phase diffused permeation.LiFeO4/C materials were prepared by coating different carbon contents.High-performance composite materials were prepared by combining carbon with element doped by two modified methods.The elements of Fe and C came from Fe3+ and sucrose,glucose,citric acid.Thermogravimetrydifferential thermal analysis (TG-DTA),X-ray diffractometer (XRD),scanning electron microscope (SEM),cycle voltammetry (CV),and charge-discharge test were used to characterize and test the surface morphology,structure,and electrochemical performance.The results show that LiFePO4/C synthesized with sucrose has higher specific discharge capacity than the other materials.The specific discharge capacity of this material is 84.27 mAh·g-1.The capacity retention could attain 94 ％ of the initial discharge capacity after 30 cycles,showing good electrochemical performance.