Hunting Sodium Dendrites in NASICON-Based Solid-State Electrolytes

NASICON- (Na superionic conductor-) based solid-state electrolytes (SSEs) are believed to be attracting candidates for sodium batteries due their high ionic conductivity and prospectively reliable stability. However, the poor interface compatibility formation of Na dendrites inhibit practical application. Herein, we directly observed propagation through NASICON-based 3.1 Zr 2 Si 2.1 P 0.9 O 12 SSE first time. Moreover, a fluorinated amorphous carbon (FAC) interfacial layer on ceramic surface was simply developed by in situ carbonization PVDF improve between metal SSEs. Surprisingly, were effectively suppressed NaF when molten contacts with FAC layer. Benefiting from optimized interface, both Na||Na symmetric cells 3 V (PO 4 ) ||Na deliver remarkably electrochemical These results offer benign reference maturation batteries.