Synthesis of cathode material LiFePO4 for rechargeable lithium-ion battery by co-precipitation method

This paper studies LiFePO4 cathode materials and Co2+-doped LiFePO4 denatured cathode material prepared by liquid co-precipitation method with lithium hydroxide, ammonium ferrous sulfate and di-ammonium phosphate as raw materials. The samples are characterized by XRD, SEM and electrochemical performance test. The results show that Co2+ - doped LiFePO4 is simple pure olive-type phase and it has good electrochemical performance. The testing results of the Co2+ -doped LiFePO4 show that the initial charge specific capacity at room temperature is 156.7mAh center dot g(-1) at 0.1C rate and that after the circulations for 60 times, its capacity is still 138.7 mAh center dot g(-1), with its attenuation rate of 11.4%, whereby indicating that a small amount of Co2+ doping can not change LiFePO4 crystal structure but improve electrochemical performances of material.