A Dynamically Stable Sulfide Electrolyte Architecture for High-Performance All-Solid-State Lithium Metal Batteries

All-solid-state batteries employing sulfide solid electrolyte and Li metal anode are promising because of their high safety and energy densities. However, the interface between Li metal and sulfides suffers from catastrophic instability which stems the practical use. Here, a dynamically stable sulfide electrolyte architecture to construct the hierarchy of interface stability is reported. By rationally designing the multilayer structures of sulfide electrolytes, the dynamic decomposing-alloying process from MS4 (M = Ge or Sn) unit in sulfide interlayer can significantly prohibit Li dendrite penetration is revealed. The abundance of highly electronic insulating decompositions, such as Li2S, at the sulfide interlayer interface helps to well constrain the dynamic decomposition process and preserve the long-term polarization stability is also highlighted. By using Li6PS5Cl||Li10SnP2S12||Li6PS5Cl electrolyte architecture, Li metal anode shows an unprecedented critical current density over 3 mA cm-2 and achieves the steady over-potential for approximate to 900 hours. Based upon the merits, the Li||LiNi0.8Co0.1Mn0.1O2 battery delivers a remarkable 75.3% retention even after 600 cycles at 1 C (1C-0.95 mA cm-2) under a low stack pressure of 15 MPa. A universal dynamically stable multilayer sulfide electrolyte to inhibit dendrite and stabilize polarization is reported. It is revealed that the dynamic decomposing-alloying process by the HVMEC-SSE interlayer prohibits dendrite penetration. Li anode shows an unprecedented critical current density over 3 mA cm-2 and holds the steady over-potential for approximate to 900 h. This work provides insights into understanding the hierarchy of interface stabilities.image

Automated summary

A dynamically stable sulfide electrolyte architecture is reported in this study, which can inhibit dendrite growth and stabilize the polarization by designing multilayer structures. The electrolyte system plays an important role in maintaining long-term polarization stability, achieving high current densities, and steady over-potential. The battery also exhibits a high capacity retention rate in the cycling test.