High Dielectric, Robust Organic-Inorganic Composite Protective Layer for Lithium Metal Anode

Abstract

The development of lithium metal anodes for next-generation batteries is still a challenge. Li dendrite growth, one of the challenges, not only induces severe safety issues but also leads to capacity fading by continuously consuming the electrolyte. In this study, we demonstrate the design and fabrication of a composite protective layer to overcome these challenges. Composite protective layers exhibit high ionic conductivity and mechanical strength. This layer not only suppresses dendrite growth but also prevents salt degradation.The composite protective layer, which exhibits synergistic soft-rigid characteristics, is placed on the Li metal anode and facilitates superior interfacial stability during long-term cycles. LiMn2O4/ coated lithium full cells using the composite protective layer enhanced capacity retention compared to the cells using bare lithium anode. The proposed strategy opens new avenues to fabricate a sustainable composite protective layer that affords superior performance in lithium metal batteries.