Ag nanoparticles incorporated interlayer enables ultrahigh critical current density for Li6PS5Cl-based all-solid-state lithium batteries

Agroydite Li6PS5Cl is one of the most promising solid electrolytes because of its high ionic conductivity and good processability. However, there are still many challenges with Li6PS5Cl and lithium anodes that prevent their industrialization, such as the growth of lithium dendrite and interfacial reactions. Interface modification of anodes has proven to be an effective method for solving these problems. Herein, we introduce Ag nanoparticles into the interface between Li6PS5Cl and metallic lithium and systematically investigate their interfacial properties. By incorporating silver nanoparticles, lithium dendrites can be depleted by forming Li–Ag alloys. Therefore, a denser and more stable interface between Li6PS5Cl and lithium metals is obtained. Benefiting from the above advantages, the Li/Li symmetrical battery with incorporated Ag nanoparticles exhibited an ultrahigh critical current density of up to 10 mA cm−2 and great cycling stability (more than 600 h). An all-solid-state battery with Ni-rich cathode and lithium metal anode demonstrates a high-capacity retention rate of 84% after 200 cycles at a current density of 0.5C. This study provides new insights into the construction of stable anode interfaces for the practical application of all-solid-state lithium batteries.