Owing　to　favorable　cell　voltage　exceeding　3　V　and　cost-effectiveness,　sodium　dual-ion　batteries　(Na-DIBs)　have　gained　increasing　emphasis,　however,　they　are　hampered　by　the　availability　of　suitable　anode.　Here,　an　exotic　Na-DIB　anode,　composed　of　Co1.67Te2　nanoparticles　embedded　within　porous　carbon　nanofibers　(Co1.67Te2@PCFs),　has　been　developed　by　a　combination　of　electrostatic　spinning　and　a　specialized　thermal　etching　process.　The　Co1.67Te2　nanoparticles　within　the　confined　space　and　porous　carbon　layers　show　energetic　capability　for　Na+　storage　and　enhanced　kinetic　behavior　of　the　cell,　further　verified　by　the　density　functional　theory　(DFT)　calculations.　Additionally,　the　formed　thin,　uniform,　and　inorganic-rich　solid　electrolyte　interphase　(SEI)　on　the　surface　of　Co1.67Te2@PCFs　after　cycling　reduces　electrolyte　consumption　and　facilitates　the　uniform　flow　of　Na+.　Electrochemically,　the　Co1.67Te2@PCFs　anode　exhibits　a　superior　reversible　capacity　of　383.5　mAh　g-1　and　maintains　stable　cycling　performance　over　1000　cycles　at　1　A　g-1.　Furthermore,　the　assembled　Na-DIB　can　power　a　“SUST”　pattern　comprising　242　light-emitting　diodes　(LEDs)　for　two　minutes,　showcasing　its　operational　potential.　This　study　introduces　a　promising　anode　material　for　Na-DIBs　and　paves　the　way　for　spatially　confined　energy　storage.　©　2024