Effect of temperature on the electrochemical performance of lithium iron phosphate/carbon cathode materials for lithium-ion batteries
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In the development of lithium iron phosphate/carbon (LiFePO4/C), a cathode composite for lithium-ion batteries, essentialraw materials including lithium carbonate (Li2CO3), iron phosphate (FePO4), and glucose (C6H12O6) were processed usinga high-temperature solid-phase method. This study provided insight into the synthesis process, particularly examining howthe heating mode and target reaction temperature critically affected the formation of LiFePO4/C. This study employedVarious characterization tool and evaluation systems of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM),Thermogravimetric Analysis (TGA) and additional performance evaluations like charge/discharge testing were employed. The findings highlight that the electrochemical properties of lithium iron phosphate/carbon (LiFePO4/C) composites aresignificantly affected by the target temperature, heating method, carbon content, and degree of graphitization of carboncoating on the material. It was observed that indirect heating methods combined with a target temperature of 750 ℃optimized the electrochemical performance of materials, enhancing both its discharge capability and electrical capacity. Thisoptimized synthesis approach underscores the intricate balance required in the thermal and compositional parameters toachieve superior battery performance.
Abstract
In the development of lithium iron phosphate/carbon (LiFePO4/C), a cathode composite for lithium-ion batteries, essentialraw materials including lithium carbonate (Li2CO3), iron phosphate (FePO4), and glucose (C6H12O6) were processed usinga high-temperature solid-phase method. This study provided insight into the synthesis process, particularly examining howthe heating mode and target reaction temperature critically affected the formation of LiFePO4/C. This study employedVarious characterization tool and evaluation systems of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM),Thermogravimetric Analysis (TGA) and additional performance evaluations like charge/discharge testing were employed. The findings highlight that the electrochemical properties of lithium iron phosphate/carbon (LiFePO4/C) composites aresignificantly affected by the target temperature, heating method, carbon content, and degree of graphitization of carboncoating on the material. It was observed that indirect heating methods combined with a target temperature of 750 ℃optimized the electrochemical performance of materials, enhancing both its discharge capability and electrical capacity. Thisoptimized synthesis approach underscores the intricate balance required in the thermal and compositional parameters toachieve superior battery performance.