A reversible conversion and intercalation reaction material for Li ion battery cathode

Although FeF3 and its hydrates have been studied as the cathode materials for Li ion batteries (LIBs), herein the FeF3/graphene composite with sheet-like structure is innovatively prepared and used as LIB cathode material. By scanning electron microscope (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffraction (XRD) and electrochemical measurement, the structure and electrochemical performance of the as-synthesized FeF3/graphene composite are investigated. The results indicate that the sheet-like structure hybrid is formed by the FeF3 nanosheets and the graphene sheets. Meantime, we demonstrate that the FeF3/graphene composite has good rate capability and cycling performance, whether it is based on conventional intercalation reaction or reversible conversion reactions.