Facile synthesis and electrochemical performance of LiFePO4/C based on modified ferrous phosphate microspheres

This paper reported a novel approach to synthesize the uniform carbon-coated LiFePO 4 /C with PAM composite micro-spherical ferrous phosphate which was produced by the co-precipitation method as the precursor. The addition of PAM effectively controlled the ferrous phosphate primary particle size around 200 nm, and the corresponding LiFePO 4 /C particle size has also been restricted which effectively shortens the transport distance of lithium ions. In addition, the resulting PAM-embedded ferrous phosphate precursor gave high conductivity of LiFePO 4 /C, and more carbon residue leads to better rate performance. The LiFePO 4 -PAM sample demonstrated excellent electrochemical performance of initial discharge capacities at 0.2, 0.5, 1, 2, and 5C are 163.3, 160.5, 155.3, 146.2, and 126.3 mAh g -1 , respectively. Furthermore, the initial charge and discharge capacity of synthesized LiFePO 4 with different PAM addition amounts was also studied.