Currently,　the　investigation　of　two-dimensional　(2D)　crystalline　materials,　notably　transition　metal　tungsten-based　sulfides,　is　scarcely　reported　in　the　wide-temperature　field.　Thus,　tungsten　sulphide　encapsulated　in　a　sulphurized　polyacrylonitrile　composite　(WS2-SPAN)　was　prepared　using　an　electrospinning　technology　combined　with　a　sulphuration　process.　By　virtue　of　the　abundant　S　vacancies　and　in　situ　N　doping,　the　WS2-SPAN　composite　shows　an　impressively　ultralong　lifespan　and　stable　circulation　capacity　over　a　wide　temperature　range　(−15-50　°C).　For　sodium　storage,　the　WS2-SPAN-2　composite　delivers　optimized　high-rate　performance　and　ultrastable　cycling　properties　(464　mA　h　g−1/450　cycles　at　0.5　A　g−1;　354　mA　h　g−1/1400　cycles　at　2　A　g−1,　190　mA　h　g−1/12　000　cycles　at　5　A　g−1;　129　mA　h　g−1/18　000　cycles　at　10　A　g−1,　surpassing　previously　reported　WS2-based　anodes　for　SIBs).　This　is　paired　with　an　Na3V2(PO4)3　cathode,　which　exhibits　excellent　storage　capacity　(241　mA　h　g−1/200　cycles　at　0.5　A　g−1).　Potassium　storage　also　demonstrates　admirable　performance　(362　mA　h　g−1/100　cycles　at　0.1　A　g−1;　278　mA　h　g−1/3000　cycles　at　1　A　g−1).　In　addition,　a　detailed　illustration　of　the　electrochemical　storage　mechanism　of　WS2-SPAN　composites　is　presented　through　theoretical　calculations　and　electrochemical　dynamics.　Thus,　the　present　investigation　provides　new　insights　into　the　preparation　of　novel　WS2-based　anodes　for　sodium/potassium-ion　batteries　with　ultralong　lifespans　and　wide-temperature　workability.　©　2023　The　Royal　Society　of　Chemistry.