A NEW GRAPHITE FLUORIDE COMPOUND AS ELECTRODE MATERIAL FOR LITHIUM INTERCALATION IN SOLID-STATE CELLS

A new method of graphite fluorination at room temperature (RT) is described which leads to ternary compounds with high fluorine content. The structure of these compounds has been studied by means of X-ray diffraction and IR spectroscopy. In comparison with conventional graphite fluorides obtained at high temperatures (HT), RT compounds show important differences, probably due to the partially ionic character of the C-F bond. The authors have also used RT graphite fluorides as cathode materials in solid-state PEO-based lithium batteries. Specific energy densities higher than 900 W h kg-1 are reached. These good performances are related to both the lamellar structure and the ionicity of these new compounds synthesized at room temperature.