Fe valence determination and Li elemental distribution in lithiated FeO0.7F1.3/C nanocomposite battery materials by electron energy loss spectroscopy (EELS)

Electron energy loss spectroscopy (EELS) is a powerful technique for studying Li-ion battery materials because the valence state of the transition metal in the electrode and charge transfer during lithiation and delithiation processes can be analyzed by measuring the relative intensity of the transition metal L3 and L2lines. In addition, the Li distribution in the electrode material can be mapped with nanometer scale resolution. Results obtained for FeO0.7F1.3/C nanocomposite positive electrodes are presented.