Synthesis and Characterization of LiFePO$_4$ Cathode with Fe:P Deficiency for Lithium Ion Batteries

LiFePO$_4$ with Fe:P deficiency has been demonstrated a promising cathode material of lithium ion battery for fast rate, high capacity applications. In this study, LiFePO$_{4}$ with various amount of Fe:P deficiency are synthesized using high energy ball milling and temperature controlled sintering under reduced gas. X-ray diffraction, X-ray absorption, cyclic voltammetry and constant current charge/discharge measurements are employed to characterize the structural and electrochemical properties of the samples. The effects brought by Fe:P deficiency on charger/discharge rate and capacity will be discussed and presented.