Synthesis of Li2FeP2O7 Cathode Material at Different Temperatures and Its Electrochemical Performance for Lithium Ion Batteries

The cathode material Li2FeP2O7 was synthesized via freeze-drying and followed by solid state sintering method. X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and Fourier transform infrared spectroscopy(FTIR)were used to characterize the struc. ture,composition and morphology of the material. In addition,the electrochemical performance of the Li2FeP2O7 material was investigated by cyclic voltammetry(CV)and electrochemical impedance spectroscopy (EIS). It was found that the greatest particle quality could be acquired when the synthesis temperature of Li2FeP2O7 was 590.. The discharge specific capacity reached 55.0 mA center dot h center dot g. 1 at 1.6C,which was much higher than that of the samples synthesized at other temperatures. The Li2FeP2O7 synthesized at 590. had a low im. pedance and a large exchange current density,which facilitated the diffusion of lithium ions and improved the electrochemical performance.