Electrochemical property of LiFePO4/C composite cathode with different carbon sources

To improve the performance of battery cathode materials that consist of carbonaceous organic material,carbon coatings on lithium iron phosphate (LiFePO/C)materials were synthesized by different carbon sources.LiFePO/C was synthesized by a combination method of sol-gel and gas-phase diffused permeation. LiFeO/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 LiFePO/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. The capacity retention could attain 94%of the initial discharge capacity after 30 cycles, showing good electrochemical performance.