Preparing carbon coated lithium ferrous phosphate using mixed iron sources

Carbon coated lithium ferrous phosphate(LiFePO4/ C)as cathode material of Li-ion battery was synthesized by solid state reaction method using mix iron sources. The surface morphology,crystal structure and the electrochemical performance were characterized by SEM,XRD,charge-discharge testing and electrochemical impedance spectra(EIS). The composite synthesized at 700 ℃ with mixed iron sources n(FeC2O4·2H2O)∶ n(FePO4) = 1∶ 1 had better electrochemical performance,when charged-discharged in 2. 5 ~ 4. 1 V,the 0. 2 C specific discharge capacity was 165. 9 mAh / g,the specific discharge capacity in the initial and 20th cycle at 2. 0 C was 135. 3 mAh / g and 141. 9 mAh / g,respectively.