The　unique　coordination　configuration　of　single-atom　materials　(SAMs)　allows　precise　reaction　control　at　atomic-level　and　a　potential　of　unusual　electrochemical　reaction.　Nevertheless,　it　is　a　big　challenge　to　prepare　main　group　element　with　high　loading　content.　Here,　multifield-regulated　synthesis　(MRS)　technology　is　utilized　to　rapidly　produce　single-atom　antimony　(Sb)　metal　with　a　high　loading　of　15　wt.%.　Ab　initio　molecular　dynamics　simulations　reveal　the　significantly　enhanced　reaction　kinetics　of　Sb　and　nitrogen-doped　graphene　by　multi-physics　field　coupling.　Compared　with　common　metallic　Sb　nanoparticles,　atomically　dispersed　Sb　displays　remarkably　improved　electrochemical　reaction　kinetics　and　stable　structure　due　to　the　negligible　variation　of　stresses　and　volume　expansion　during　the　pseudocapacitive　alloying-dealloying　process.　Such　extraordinary　alloying　reaction　in　well-dispersed　Sb　atoms　enabling　homogeneous　ion　flow　can　serve　as　active　nucleation　sites　for　regulating　even　Na　metal　nucleation　and　growth.　As　a　result,　copper　foil　coated　with　only　≈3 µm　thickness　of　such　material　exhibits　a　high　Coulombic　efficiency　of　up　to　99.99%,　an　ultra-low　overpotential　of　3 mV,　and　a　long　lifetime　exceeding　2500 h　in　symmetrical　cells.　Furthermore,　an　anode-free　MRS-SbSA||Na3V2(PO4)3　battery　is　constructed,　which　demonstrates　exceptionally　high　energy　density　(≈362 Wh　Kg−1),　outstanding　rate　capability　and　good　cycling　stability.　©　2024　Wiley-VCH　GmbH.