Electrochemical Kinetic Study of LiFePO4 Using Cavity Microelectrode

Lithium cation insertion and extraction in LiFePO 4 were electrochemically studied with a cavity microelectrode (CME). Cyclic voltammetry measurements were used to characterize the kinetics of the material. LiFePO 4 was successfully cycled from 0.1 mV s –1 up to 1 V s –1 and is therefore a suitable material to be used in high power applications, such as asymmetric hybrid supercapacitors. Several kinetic behaviors were observed depending on the sweep rate. The LiFePO 4 was found to follow different kinetics behaviors depending of the sweep rate. The charge storage mechanisms were investigated for Li + extraction/insertion.