Electrochemical performance of LiFePO 4 /GO composite for Li-ion batteries

Abstract Wide-spread and extended applications of Li-ion secondary batteries necessitate the development of advanced electrode materials with exceptional electrochemical performances, which mostly depends on the cathode materials. LiFePO 4 (LFP) has been extensively considered as promising cathode materials due to its high stability, abundance and environmentally friendliness. Herein, a simple solution combustion technique is developed to prepare single phase LFP material with submicron particles. The XPS studies ascertain + 2 and + 5 oxidation states of Fe and P, respectively. The cyclic voltammetry of LiFePO 4 reveals redox mechanism of Fe 2+ /Fe 3+ . The LiFePO 4 delivers specific capacity of 106 mAh g −1 for 1st cycle with 96.36% coulombic efficiency. Moreover, the presence of graphene oxide (GO), in LFP/GO composite, control the growth and agglomeration of LiFePO 4 . On evaluation, LFP/GO shows superior electrochemical performance possessing the specific capacity of 162 mAh g −1 at 0.1 C, owing to the effective conducting network formed by GO reducing Li-ion diffusion path for LiFePO 4 .