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However, their sodium\u2010storage mechanism typically shifts to an alloying reaction between P and Na\n                    <jats:sup>+<\/jats:sup>\n                    after the initial sodiation process, leading to rapid capacity decay. Herein, we report a highly reversible conversion reaction of Co\n                    <jats:sub>2<\/jats:sub>\n                    P in SIBs by confining ultrasmall Co\n                    <jats:sub>2<\/jats:sub>\n                    P nanoparticles within Ti\n                    <jats:sub>3<\/jats:sub>\n                    C\n                    <jats:sub>2<\/jats:sub>\n                    T\n                    <jats:sub>x<\/jats:sub>\n                    MXene interlayers. The resulting composites exhibit greatly improved sodium\u2010storage performance, including a high reversible capacity (562 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 0.2 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    after 200 cycles), excellent rate capability (288 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 10 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), outstanding energy density (291\u00a0Wh kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), and cycling stability (84% capacity retention over 1000 cycles at 2 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) in full cells, representing the best performance reported for Co\n                    <jats:sub>2<\/jats:sub>\n                    P anodes to date. In situ and ex situ analyses reveal that MXene confinement enables highly reversible conversion reactions in Co\n                    <jats:sub>2<\/jats:sub>\n                    P anodes.\n                  <\/jats:p>","DOI":"10.1002\/smll.75340","type":"journal-article","created":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T10:02:16Z","timestamp":1787997736000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["MXene\u2010Confined Cobalt\u2010Rich Co\n                    <sub>2<\/sub>\n                    P Nanoparticles Enable Highly Reversible Conversion Reaction for Stable and Fast Sodium\u2010Ion Batteries"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0063-2599","authenticated-orcid":false,"given":"Jiayong","family":"Tang","sequence":"first","affiliation":[{"name":"Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology (AIBN) &amp; School of Chemical Engineering The University of Queensland Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2745-3005","authenticated-orcid":false,"given":"Xiyue","family":"Peng","sequence":"additional","affiliation":[{"name":"Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology (AIBN) &amp; School of Chemical Engineering The University of Queensland Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2569-9877","authenticated-orcid":false,"given":"Xia","family":"Huang","sequence":"additional","affiliation":[{"name":"Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology (AIBN) &amp; School of Chemical Engineering The University of Queensland Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8487-2620","authenticated-orcid":false,"given":"Xiaobo","family":"Zhu","sequence":"additional","affiliation":[{"name":"Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology (AIBN) &amp; School of Chemical Engineering The University of Queensland Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9209-4208","authenticated-orcid":false,"given":"Qinfen","family":"Gu","sequence":"additional","affiliation":[{"name":"Australian Synchrotron (ANSTO) Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2088-6403","authenticated-orcid":false,"given":"Bin","family":"Luo","sequence":"additional","affiliation":[{"name":"Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology (AIBN) &amp; School of Chemical Engineering The University of Queensland Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5947-306X","authenticated-orcid":false,"given":"Lianzhou","family":"Wang","sequence":"additional","affiliation":[{"name":"Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology (AIBN) &amp; School of Chemical Engineering The University of Queensland Brisbane Queensland Australia"},{"name":"Department of Applied Biology and Chemical Technology Faculty of Science The Hong Kong Polytechnic University  Hong Kong P. 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