Abstract Click to copy section linkSection link copied! NASICON (Na super ionic conductor)-type sodium superionic conductors are promising candidates for all-solid-state sodium-ion batteries owing to their high ionic conductivity and structural tunability. While NASICONs have been extensively investigated, thio-NASICONs, where O2– is replaced by larger, more polarizable S2–, remain comparatively underexplored despite their potential for enhanced Na+ transport.