Molecular bridges stabilize lithium metal anode and solid-state electrolyte interface

Rechargeable solid-state lithium metal battery (SSLMB) with high safety and energy density is regarded as one of the most promising candidates for next-generation energy-storage systems. However, the long-term interfacial stability between lithium metal anode and solid-state electrolyte is still a great challenge. Herein we propose an interfacial “molecular bridge” strategy to improve the interfacial adhesion between lithium metal anode and solid-state electrolyte by chemical bonding. As consequence, the lithium metal anode shows high interfacial wettability with solid-state electrolyte film, and Li/Li symmetrical cells display outstanding cycling stability with reduced polarization voltage, stable interfacial resistance, and dendrite-free lithium surface. In addition, high voltage LiCoO 2 (LCO)/Li full cells show enhanced cycling stability and superior rate capability. Moreover, the LCO/Li pouch cell exhibits excellent durability in harsh operating conditions such as bending and shearing. This scalable, simple and feasible interfacial-stabilization strategy offers a new route to the development and practical application of high-performance SSLMB.