Flame Retardant Lithium Composites With Synergistic Suppression of Lithium Dendrites and Smoke Toxicity for High Safe Lithium Metal Batteries

Lithium metal batteries (LMBs) are regarded as the promising next‑generation high energy density storage, but their commercialization is hindered by uncontrolled Li dendrite growth and the persistent risk of thermal runaway. Herein, a multifunctional artificial interface membrane is designed through electrospinning combined with in situ metal‐organic framework (MOF) growth, aiming to construct a highly safe lithium metal anode. The uniformly dispersed MOF nanoparticles in the membrane generate uniform Li + flux through their inherent cage window structure, effectively inhibiting excessive Li dendrite formation and thereby stabilizing the lithium metal anode with improved cycling stability. Notably, the membrane exhibits strong adsorption and catalytic ability for hazardous CO gases released during thermal runaway, enabling valid conversion of CO to CO 2 . Importantly, the ignition time of the as‐prepared Li metal composite anode is significantly prolonged, providing a valuable time window for battery fire accident response and personnel rescue. This work demonstrates a multifunctionally flame retardant interface protective layer design method through integrated interfacial and rational material structure engineering. It leads to a new strategy for synergistic suppression of Li dendrites and smoke toxicity in future safe LMBs.