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Mechanical properties characterizations of the pinhole-free-Li3N–Li metal anode. (a) Crack size vs curvature plot for a pinhole-free-Li3N film and a Li3N nanofilm. The inset in (a) shows a digital image of a pinhole-free-Li3N–Li metal anode under bending. (b) Top-view SEM images of a pinhole-free-Li3N film (left) and a Li3N nanofilm (right) under bending at a curvature radius of 1 cm.
