Speakers

​​ Enhancing both safety and electrochemical performance remains a critical challenge for lithium metal batteries employing solid polymer electrolytes. In this work, a bilayer polymer electrolyte system is engineered to simultaneously achieve flame-retardant behavior and efficient ion transport by integrating decarbromodiphenyl ethane and zeolite-derived functional componets. The ionic traspert properties are further improved by increasing the content of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), which promotes ion dissociation and reduces interfacial impedance. As a result, the developed electrolyte exhibits an ionic conductivity of 1.2 mS cm-1 at 60 oC and sustains a wide electrochemical stability window up to 5.2 V. Notalbly, adjusting the LiTFSI concentration to 60 wt% relative to the polymer matrix effectively mitigates LiF accumulation at the interface, leading to enhanced interfacial robutness. When applied in a LiFePO4-based cell configuration, the system delivers a discharge capacity of 156.6 mAhg-1, retains 94.3 % of its capacity after 250cycles, and maintarins a Coulombic efficiency of 98.2% at 1C rate. These finding demonstratethat the proposed electrolyte design provides a viable pathway toward high-performance and intrinsically safer solid-state lithium metal batteries.