二次烧结工艺对磷酸铁锂的性能影响OA

This study systematically investigates the effects of secondary sintering processes on the physicochemical and electrochemical properties of lithium iron phosphate(LiFePO4)materials.Using the carbothermal reduction method,the effects of different secondary sintering temperatures(690℃,720℃,750℃,780℃)on LiFePO4 properties were investigated.At the optimal sintering temperature,an appropriate amount of carbon source was introduced and combined with varying Li/Fe ratios(1.030-1.042)to enhance the material's comprehensive performance.Characterization was conducted using X-ray diffraction(XRD),scanning electron microscopy(SEM),and other characterization techniques.Results indicate that sintering at 720℃yields a material packing density of 2.59g/cm3.At this temperature,adding an appropriate amount of carbon source significantly reduces the resistivity of LiFePO4 and improves its electrical properties.The optimal comprehensive performance was achieved at a Li/Fe ratio of 1.042,with a compacted density of 2.56g/cm3,a 0.1C discharge capacity of 160.3mAh/g,a 0.5C discharge capacity of 153.3mAh/g,a 1C discharge capacity of 148.9 mAh/g,and significantly improved polarization phenomena.This study provides an effective process optimization pathway for enhancing the comprehensive performance of lithium iron phosphate materials.