LiFePO₄/RGO composites synthesized by a solid phase combined with carbothermal reduction method

Abstract

LiFePO4/reduced graphene oxide composites (LiFePO4/RGO) were synthesized via a simple solid phase combined with carbothermal reduction method. The samples were characterized by X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). Furthermore, cyclic voltammetry (CV), electrochemicaal impendence spectroscopy (EIS) and galvanostatic charge/discharge tests were conducted to further study the electrochemical properties of LiFePO4/RGO composites. The initial discharge specific capacity of LiFePO4/RGO was 151.5 mAh g−1 at 0.1C, and after 50 cycles, it still remains 149.2 mAh g−1. The results reveal that LiFePO4/RGO composites improved the discharge specific capacity and rate charge-discharge performance.