Study on Preparation of Cathode Material of Lithium Iron Phosphate Battery by Self-Craning Thermal Method

The cathode material of carbon-coated lithium iron phosphate (LiFePO4/C) lithium-ion battery was synthesized by a self-winding thermal method. The material was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The electrochemical properties of LiFePO4/C materials were measured by the constant current charge-discharge method and cyclic voltammetry. The results showed that the LiFePO4/C material prepared by the self-propagating heat method has a typical olivine crystal structure, and the product had fine grains and good electrochemical properties. The optimal sintering temperature is 700 ℃, the sintering time is 24 h, the particle size of the lithium iron phosphate material is about 300 nm, and the maximum discharge capacity is 121 mAh/g at 0.1 C rate.