Investigation on a core–shell nano-structural LiFePO4/C and its interfacial CO interaction

Core–shell LiFePO4/C nanocomposite has been prepared by a sol–gel method. The mean size of the spherical core LiFePO4 is about 30 nm, and thickness of carbon shell is about 3 nm. The bonding character on the interface of core–shell was revealed by soft X-ray absorption spectroscopy (XAS). The as-prepared sample was characterized by X-ray diffraction (XRD), Raman spectrum, Transmission electron microscope (TEM) and High-resolution transmission electron microscopy (HRTEM). Charge-discharge tests show the core–shell LiFePO4/C demonstrates high rate capability (106 mAh g−1 at 20 C) and good cycling performance (negligible capacity loss after 250 cycles).