Heat-Rate-Controlled Hydrothermal Synthesis of LiFePO_4 Achieved by Different Heating Sources

摘要

The highly crystalline LiFePO_4 particles were hydrothermally fabricated by using different heating sources at 160°C for 60 min. The X-ray diffraction patterns of both sample presented a good fit with the pure phase without impurity phases. Rietveld refinement results reveal that the degree of F_(eLi) antisite defect could decrease with increasing heating rate. Morphologic studies and specific surface areas result show that the morphology and mean crystallite sizes of the obtained particles were strongly dependent on heating rate. Electrochemical data show that the hydrothermally synthesized LiFePO_4 with nanorod structure prepared by microwaves heating source exhibited higher electrochemical activity during charge and discharge process.