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Presodiation can improve ICE by compensating for sodium loss caused by irreversible defects in HC. However, research on how the active sodium content during presodiation affects the formation and stability of the preconstructed solid electrolyte interface (SEI) remains limited. Based on this background, this work introduces many pyrrolic nitrogen (N\u20105) sites into HC through pyrolysis of a urea\u2010HC composite, working in synergy with chemical presodiation to enhance sodium\u2010ion provision. Experimental and theoretical investigations reveal that the N\u20105 sites strengthen the adsorption capability for Na\n                    <jats:sup>+<\/jats:sup>\n                    and its ability to capture PF\n                    <jats:sub>6<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    from the electrolyte, promoting the preformation of a stable, inorganic\u2010rich SEI layer. As a result, the PS\u20100.5NHC achieves an excellent ICE of 98.54%, a capacity retention of 90.6% after 1000 cycles at 1.5 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    . In a full\u2010cell configuration, the ICE is also significantly improved from 70.74% to 91.53%. This work provides a novel design concept for mitigating the inherent defects of the HC anode.\n                  <\/jats:p>","DOI":"10.1002\/advs.75460","type":"journal-article","created":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T11:06:04Z","timestamp":1782126364000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["N\u2010Doping Activated Presodiation Enhances Sodium\u2010Ion Provision in Hard Carbon Anodes"],"prefix":"10.1002","volume":"13","author":[{"given":"Hua","family":"Lin","sequence":"first","affiliation":[{"name":"School of Pharmaceutical Sciences Institute of Materia Medica Xinjiang University  Urumqi China"},{"name":"Department of Physics Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials Xiamen University  Xiamen 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