Nanowerk  April 5, 2023 Researchers at Argonne National Laboratory demonstrated lithiation gradients and electrode assembly movement during electrochemical cycling of a Li-metal cell containing a Ni–Mn–Co layered oxide cathode (NMC811). During charge, deposition of Li+ ions from the cathode increased the Li foil thickness; during discharge, the thickness decreased as Li+ ions are stripped off the foil. The resulting periodic movement was observed through tracking of Bragg peaks from the ordered phases of the cathode and separator. In addition to this 3.6 μm/mAh displacement, continuous mossy Li build-up on the anode caused an irreversible drift of the assembly, which is […]