An ion‐percolating electrolyte membrane for ultrahigh efficient and dendrite‐free lithium metal batteries

Abstract The development of lithium (Li) metal batteries has been severely limited by the formation of lithium dendrites and the associated catastrophic failure and inferior Coulombic efficiency which caused by non‐uniform or insufficient Li + supply across the electrode–electrolyte interface. Therefore, a rational strategy is to construct a robust electrolyte that can allow efficient and uniform Li + transport to ensure sufficient Li + supply and homogenize the Li plating/stripping. Herein, we report an ion‐percolating electrolyte membrane that acts as a stable Li + reservoir to ensure a near‐single Li + transference number (0.78) and homogenizes Li + migration to eradicate dendrite growth, endowing Li//LFP cell with an ultrahigh average Coulombic efficiency (ca. 99.97%) after cycling for nearly half of a year and superior cycling stability when pairing with LiCoO 2 with limited Li amount and LiNi 0.8 Mn 0.1 Co 0.1 O 2 . These estimable attributes demonstrate significant potential of utility value for the ion‐percolating electrolyte. image