Horizontal Stress Release for Protuberance‐Free Li Metal Anode

Abstract

AbstractDendrite‐induced short circuit and capacity loss present major barriers to high‐energy‐density lithium (Li) metal batteries. Many approaches have been proposed to regulate or restrain the formation of Li dendrite, yet it has not been fully eliminated. Herein, a dredging tactic with hemisphere‐like concaves is designed to horizontally release the stress during Li deposition, making both upper smooth Li and nether granular Li dwell inside the compartmented tummy. With such protuberance‐free Li metal anode, an ultrahigh Coulombic efficiency over 96% of the half‐cell is maintained after 490 cycles and capacity retention of 100% for the full cell paired with a LiFePO4 cathode after 140 cycles (with low N/P ratio of ≈5) is achieved simultaneously. This study contributes to a deeper comprehension of electrochemical metal deposition and promotes the development of safe batteries.