Local Interactions Governing the Performances of Lithium- and Manganese-Rich Cathodes.

The local structural and electronical transformations occurring along the first charge and discharge cycle of Li- and Mn-rich Li[LiNiMnCo]O cathode material have been characterized by X-ray absorption spectroscopy at several complementary edges. The irreversible spinel formation, occurring at the expenses of the cycling layered phase during the first charge, is quantified (about 10%) and spatially localized. The local strains induced by the Ni oxidation have been evaluated.