where D is the diffusion coefficient, B is the atomic displacement parameter attributed to thermal vibration and〈𝑅 𝑛 2 〉 is the mean squared displacement of a specific atom type. The calculated diffusion coefficient of fluoride ions at the cell's operating temperature is approximately 1.47 × 10⁻⁷ cm²/s. To best of knowledge, experimental data on intercalation cathodes for FIBs are not available so a direct comparison cannot be made. Comparing this result with literature data on lithium-ion diffusion in layered materials is challenging, as diffusion coefficients vary significantly depending on the measurement technique. However, this value falls within the range of diffusion coefficient observed for lithium in layered materials. For example, the measured diffusion coefficient for LiCoO2 at room temperature vary between 10 - 7 cm 2 /s and 10 -9 cm 2 /s. The calculated diffusion coefficient should be interpreted with caution since this preliminary investigation doesn't take into account several aspects that may influence fluoride mobility in real samples, for example the presence of oxygen excess.