Synthesis of LiFePO_4/C cathode material with improved performance by two kinds of carbon sources

In order to improve the electrochemical performances of LiFePO_4,LiFePO_4/C composite was synthesized via solid-state reaction with two kinds of carbon sources: carbon sol-gel and glucose.The structure and electrochemical properties of the LiFePO_4/C composite were characterized by XRD,TEM and galvanostatic charge-discharge.The electrochemical measurement and XRD results indicate that carbon coating doesn′t work on the phase of LiFePO_4.A distinct carbon layer can be observed surrounding the LiFePO_4 particle by TEM.LiFePO_4/C synthesized with two kinds of carbon sources shows higher discharge specific capacity than LiFePO_4/C with single carbon source at the same rate,it also shows good rate performance and cycle stability.A discharge specific capacity of 162mAh/g is obtained at 0.1C,and 157mAh/g is obtained at 1C,no loss of capacity is found after 20 cycles.