LiFePO4/C composite with a three-dimensional foam structure constructed via evaporative self-assembly assisted by polyethylene glycol and its improved electrochemical performance

Three-dimensional foam structure LiFePO4/C composite has been successfully synthesized via evaporative self-assembly assisted by polyethylene glycol. The morphologies, structures and properties of bare LiFePO4 and LiFePO4/C are investigated by X-ray diffractometer, scanning electron microscope, and transmission electron microscope. LiFePO4/C composite exhibits high capacity of 150 mA h g−1 at the 1 C rate, and excellent rate performance (120 mA h g−1 at the 20 C rate). The improved properties can be attributed to a unique three-dimensional foam structure constructed by facile evaporative self-assembly. Furthermore, the unique structure can increase the electrochemical reaction surface, enhance the electrochemical conductivity and promote lithium ion diffusion.