Engineering Wavy‐Nanostructured Anode Interphases with Fast Ion Transfer Kinetics: Toward Practical Li‐Metal Full Batteries

Fast Li-metal depletion and severe anode pulverization are the most critical obstacles for the energy-dense Li-metal full batteries using thin Li-metal anodes (<50 mu m). Here, a wavy-nanostructured solid electrolyte interphase (SEI) with fast ion transfer kinetics is reported, which can promote high-efficiency Li-metal plating/stripping (>98% at 4 mAh cm(-2)) in conventional carbonate electrolyte. Cryogenic transmission electron microscopy (cryo-TEM) further reveals the fundamental relationship between wavy-nanostructured SEI, function, and the electrochemical performance. The wavy SEI with greatly decreased surface diffusion resistance can realize grain coarsening of Li-metal deposition and exhaustive dissolution of active Li-metal during the stripping process, which can effectively alleviate "dead Li" accumulation and anode pulverization problems in practical full cells. Under highly challenging conditions (45 mu m Li-metal anodes, 4.3 mAh cm(-2)high capacity LiNi(0.8)Mn(0.1)Co(0.1)O(2)cathodes), full cells exhibit significantly improved cycling lifespan (170 cycles; 20 cycles for control cells) via the application of wavy SEI.