上海科技大学知识管理系统

Garnet-type electrolyte (LLZTO) with high ionic conductivity and excellent electrochemical stability is considered as the possible solid electrolyte for solid-state lithium metal batteries (SSLMBs). Despite these promising merits, the poor interface contact with Li resulting from the lithophobic Li2CO3 layer and the persistent proliferation of lithium dendrites have remained major challenges in interfacial design. Herein, a lithiophilic Ag/AgF layer (AFL) based on the robust alkaline electrolyte interface is proposed aimed at addressing these issues. Due to the differences of adhesion energies between Li/Li9Ag4 and Li/LiF, molten Li reacts with the AFL to spontaneously form a Li9Ag4/LiF dual-layer multifunctional layer (AFDML). LiF suppresses Li dendrite growth, while Li9Ag4 enhances the transport of Li+ at the interface. Owing to the unique structural and elemental composition integration, the AFDML not only reduces the interface impedance to 0.995 Omega cm2, but endows a high critical current density of 2.2 mA cm- 2 and outstanding cycling life (stable at a current density of 0.3 mA cm- 2 for over 8000 h). Furthermore, the high cathode loading cells matched with LiNi0.83Co0.12Mn0.05O2 display a high reversible areal capacity of 2.5 mAh cm-2 without significant capacity degradation over 70 cycles.