Synthesis of nano FePO(4) and electrochemical characterization of composite cathode material LiFePO(4)/C

Nano FePO(4) upsilon .xH(2)O powders were synthesized by controlled crystallization method, using Fe(III) compound as the iron source. The nano FePO(4) upsilon .xH(2)O powders were pretreated at 500 degree C for 4 h in air to obtain nano FePO(4) precursor. Then the olivine nano LiFePO(4)/C composites were obtained through carbonthermal reduction process at different temperatures. The structure, morphology, physicochemical properties and electrochemical properties of the nano FePO(4) upsilon .xH(2)O powder, FePO(4) precursor and LiFePO(4)/C composites synthesized at different temperatures were characterized in detail by thermogravimetric/differential scanning calorimeter (TG/DSC), X-ray diffraction (XRD), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) surface area measurement and electrochemical measurement. The results show that the nano LiFePO(4)/C composite calcined at 700 degree C for 10 h has fine particle sizes of about 40-100 nm.The BET test shows that the as-prepared nano LiFePO(4)/C