Preparation of LiFePO(4) Powders by Ultrasonic Spray Drying Method and Their Memory Effect

The memory effect of lithium-ion batteries (LIBs) was first discovered in LiFePO(4), but its origin and dependence are still not clear, which is essential for regulating the memory effect. In this paper, a home-made spray drying device was used to successfully synthesize LiFePO(4) with an average particle size of about 1 μm, and we studied the influence of spray drying temperature on the memory effect of LiFePO(4) in LIBs. The results showed that the increasing of spray drying temperature made the memory effect of LiFePO(4) strengthen from 1.3 mV to 2.9 mV, while the capacity decreased by approximately 6%. The XRD refinement and FTIR spectra indicate that the enhancement of memory effect can be attributed to the increment of Li–Fe dislocations. This work reveals the dependence of memory effect of LiFePO(4) on spray drying temperature, which will guide us to optimize the preparation process of electrode materials and improve the management system of LIBs.