Reactive lithium fluoride revitalizes bulk-interface Na-ion transport in all-solid-state PEO-based sodium batteries

cathode demonstrate exceptional cycling stability, retaining 82.8% of the initial capacity after 400 cycles at 0.5C-markedly outperforming state-of-the-art polymer electrolyte-based ASSMBs. This study provides fundamental insights into the supramolecular functionalities of reactive fluorides, thereby offering a viable route to advance high-performance polymer-based ASSMBs.