High-voltage pyrophosphate cathode: insights into local structure and lithium-diffusion pathways.

Ion-transport paths: combined modeling and neutron diffraction studies provide atomic-scale insights into Li(2)FeP(2)O(7), a material proposed for a new lithium-battery cathode with reversible electrode operation at the highest voltage of all known Fe-based phosphates. The results indicate that Li(+) ions are transported rapidly through a 2D network along the paths shown in green in the picture.