LiFePO4/carbon nanowires with 3D nano-network structure as potential high performance cathode for lithium ion batteries

Preparation of LiFePO4 Powders by Ultrasonic Spray Drying Method and Their Memory Effect

The memory effect of lithium-ion batteries (LIBs) was first discovered in LiFePO₄, 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 LiFePO₄ with an average particle size of about 1 μm, and we studied the influence of spray drying temperature on the memory effect of LiFePO₄ in LIBs. The results showed that the increasing of spray drying temperature made the memory effect of LiFePO₄ 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 LiFePO₄ on spray drying temperature, which will guide us to optimize the preparation process of electrode materials and improve the management system of LIBs.

Influence of TiO2 surface coating on the electrochemical properties of V2O5 micro-particles as a cathode material for lithium ion batteries

Based on V₂O₅ micro-particle, TiO₂-coated V₂O₅ micro-particle was obtained by hydroxylation of tetrabutyl titanate, whose electrochemical cyclic stability as cathode for LIBs is improved due to the protective role of TiO₂ coating layer.