Heterostructured　anode　materials　have　garnered　significant　attention　in　recent　years　due　to　their　ability　to　optimize　interfacial　structures　between　different　components.　This　design　not　only　facilitates　the　formation　of　stable　solid-electrolyte　interphase　(SEI)　films　but　also　enhances　the　overall　electrochemical　performance,　including　battery　capacity　and　cycle　stability.　In　this　study,　a　novel　N-doped　carbon-modified　NiSe2/FeSe2　heterostructure　combined　with　carbon　nanotubes　(NC@NFS/CNTs)　composite　was　successfully　synthesized　via　co-precipitation　and　gas-phase　selenization.　This　material　was　subsequently　applied　as　an　anode　for　Na-ion　batteries　(NIBs).　Based　on　the　synergistic　effect　of　the　interfacial　properties　of　the　heterostructure　and　the　highly　conductive　nature　of　CNTs,　the　NC@NFS/CNTs　composite　exhibited　excellent　electrochemical　stability　and　superior　long-term　durability.　The　battery　retains　a　capacity　of　332.4　mAh　g−1　after　5000　charge/discharge　cycles　a　current　density　of　5　A　g−1.　Moreover,　the　capacity　retention　rate　remains　as　high　as　77　%　even　after　10,000　cycles　at　an　ultra-high　current　density　of　40　A　g−1.　Ex-situ　XPS　and　XRD　analyses,　along　with　low-temperature　EIS　tests,　demonstrate　that　the　Na+　storage　properties　of　the　NC@NFS/CNTs　electrode　are　significantly　enhanced.　This　improvement　is　primarily　attributed　to　the　heterojunction　structure　and　the　presence　of　highly　conductive　phases　(CNTs　and　N-doped　carbon　layers),　which　effectively　improve　the　electrode＇s　kinetic　performance　and　enhance　the　stability　of　the　SEI　film.　©　2025　Elsevier　Inc.