Kinetic study on LiFePO4-positive electrode material of lithium-ion battery

LiFePO4-positive electrode material was successfully synthesized by a solid-state method, and the effect of storage temperatures on kinetics of lithium-ion insertion for LiFePO4-positive electrode material was investigated by electrochemical impedance spectroscopy. The charge-transfer resistance of LiFePO4 electrode decreases with increasing the storage temperatures. This suggests that it has a high electrochemical activity at high temperature. The diffusion coefficient of lithium ion is greatly increased with increasing the storage temperatures, indicating that the kinetics of Li+ and electron transfer into the electrodes were much fast at high storage temperature.