Two-dimensional polymeric metal phthalocyanines with anion fluxing and Li-ion-conducting properties for lithium metal full batteries

Herein, we report the molecular engineering of anion-fluxing polymeric metal phthalocyanines (MTPs) by controlling the types of metal centers and incorporating lithiophilic linkers to achieve ultrastable Li metal batteries. Spectroscopic characterization, cryogenic transmission electron microscopy, and computational simulations demonstrate that the Co–N 4 sites of Co in the incorporated MTP (CoTP) facilitate the local accumulation and directional flux of TFSI anions, inducing the formation of uniform, dense LiF-rich solid electrolyte interphases. As a result of this interfacial chemistry, symmetric cells with CoTP@CC–Li exhibited outstanding cycling stability, exceeding 2500 hours at 1 mA cm −2 and 1 mAh cm −2 . CoTP@CC–Li||LiFePO 4 full cells operated stably for over 600 cycles under fast charge/discharge conditions, with a high-mass-loading cathode of 20 mg cm −2 . CoTP@CC–Li||LiFePO 4…