{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T18:02:17Z","timestamp":1791223337298,"version":"4.1.0"},"reference-count":38,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2025,5,2]],"date-time":"2025-05-02T00:00:00Z","timestamp":1746144000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,5,2]],"date-time":"2025-05-02T00:00:00Z","timestamp":1746144000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52072119"],"award-info":[{"award-number":["52072119"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004735","name":"Natural Science Foundation of Hunan Province","doi-asserted-by":"publisher","award":["2023JJ50015"],"award-info":[{"award-number":["2023JJ50015"]}],"id":[{"id":"10.13039\/501100004735","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small Methods"],"published-print":{"date-parts":[[2025,8]]},"abstract":"Abstract<\/jats:title>\n \n Iron\u2010manganese\u2010based polyanionic compounds (Na\n 4<\/jats:sub>\n Fe\n 3\u2010x<\/jats:sub>\n Mn\n x<\/jats:sub>\n (PO\n 4<\/jats:sub>\n )\n 2<\/jats:sub>\n P\n 2<\/jats:sub>\n O\n 7<\/jats:sub>\n ) have attracted extensive interest as cathode for sodium ion batteries (SIBs) owing to higher working voltage, and higher energy density compared to Na\n 4<\/jats:sub>\n Fe\n 3<\/jats:sub>\n (PO\n 4<\/jats:sub>\n )\n 2<\/jats:sub>\n P\n 2<\/jats:sub>\n O\n 7<\/jats:sub>\n . However, such cathode suffers from sluggish Na\n +<\/jats:sup>\n diffusion, severe voltage hysteresis, and large structural strain caused by Jahn\u2010Teller distortion of Mn\n 3+<\/jats:sup>\n . Taking Na\n 4<\/jats:sub>\n Fe\n 2<\/jats:sub>\n Mn(PO\n 4<\/jats:sub>\n )\n 2<\/jats:sub>\n P\n 2<\/jats:sub>\n O\n 7<\/jats:sub>\n (NFMPP) as an example, herein, a synergistic engineering strategy of vacancy and doping for constructing Na\n 4<\/jats:sub>\n Fe\n 2<\/jats:sub>\n Mn\n 1\u20105y\/3<\/jats:sub>\n Nb\n 2y\/3<\/jats:sub>\n \u25a1\n y<\/jats:sub>\n (PO\n 4<\/jats:sub>\n )\n 2<\/jats:sub>\n P\n 2<\/jats:sub>\n O\n 7<\/jats:sub>\n cathodes (\u25a1: vacancy) is developed where vacancies endow rigid MnO\n 6<\/jats:sub>\n octahedra more flexible for boosting Na\n +<\/jats:sup>\n mobility while Nb doping stabilize crystal structure. Based on theoretical calculations and electrochemical characterizations, the optimized Na\n 4<\/jats:sub>\n Fe\n 2<\/jats:sub>\n Mn\n 0.9<\/jats:sub>\n Nb\n 0.04<\/jats:sub>\n \u25a1\n 0.06<\/jats:sub>\n (PO\n 4<\/jats:sub>\n )\n 2<\/jats:sub>\n P\n 2<\/jats:sub>\n O\n 7<\/jats:sub>\n exhibits the lowest Na\n +<\/jats:sup>\n diffusion energy barrier, the best rate capability and cyclability at both room temperature and elevated temperature than those of NFMPP with only vacancy\/doping. Such cathode shows a specific capacity of 63.6\u00a0mAh\u00a0g\n \u22121<\/jats:sup>\n at 50 C, a capacity retention of 91.0% after 10\u00a0000 cycles at 10 C, and a capacity retention of 70.1% after 3\u00a0000 cycles at 10 C (50\u00a0\u00b0C) in half cell, and also delivers a reversible capacity of 96.5\u00a0mAh\u00a0g\n \u22121<\/jats:sup>\n at 0.1 C and a capacity retention of 88.2% after 300 cycles in full cell.\n <\/jats:p>","DOI":"10.1002\/smtd.202500393","type":"journal-article","created":{"date-parts":[[2025,5,2]],"date-time":"2025-05-02T08:54:04Z","timestamp":1746176044000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Synergistical Engineering of Vacancy and Doping Enables High\u2010Rate and Ultrastable Na\n 4<\/sub>\n Fe\n 2<\/sub>\n Mn(PO\n 4<\/sub>\n )\n 2<\/sub>\n P\n 2<\/sub>\n O\n 7<\/sub>\n Cathode for Sodium Ion Batteries"],"prefix":"10.1002","volume":"9","author":[{"given":"Chenxi","family":"Jiang","sequence":"first","affiliation":[{"name":"School of Biology Food and Environment Anhui Key Laboratory of Sewage Purification and Ecological Rehabilitation Materials Hefei University Hefei 230601 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinqin","family":"Yu","sequence":"additional","affiliation":[{"name":"College of Materials and Chemical Engineering Pingxiang University Pingxiang 337055 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunyang","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bowen","family":"Huang","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Hunan University Changsha 410082 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8522-0808","authenticated-orcid":false,"given":"Xinlai","family":"Wei","sequence":"additional","affiliation":[{"name":"School of Biology Food and Environment Anhui Key Laboratory of Sewage Purification and Ecological Rehabilitation Materials Hefei University Hefei 230601 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3217-8183","authenticated-orcid":false,"given":"Yuan\u2010Li","family":"Ding","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Hunan University Changsha 410082 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