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Among layered cathodes, O3\u2010type NaFe\n                    <jats:sub>0.5<\/jats:sub>\n                    Mn\n                    <jats:sub>0.5<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    exhibits high theoretical capacity and environmental compatibility but suffers from structural degradation driven by O3\u2192P3 transitions, volume variation, and transition\u2010metal migration during cycling. Herein, Mg\n                    <jats:sup>2+<\/jats:sup>\n                    is incorporated to regulate the lattice stability and electrochemical performance of NaFe\n                    <jats:sub>0.5<\/jats:sub>\n                    Mn\n                    <jats:sub>0.5<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    via grain boundaries\/interface difustion at solid state. The sample Mg4\u2010NFM was synthesized via a solid\u2010state route and systematically characterized. The x\u2010ray diffraction combined with Williamson\u2013Hall analysis reveals Mg\u2010induced lattice modulation, micro\u2010strain regulation, and crystallite\u2010size variation, while SEM, FTIR, Raman spectroscopy, and BET measurements provide complementary insights into morphology, bonding, vibrational characteristics, and surface properties. Electrochemical evaluations demonstrate that the 0.48 At% Mg atoms in the hybrid sample deliver the optimal performance, achieving an initial discharge capacity of 83.3 mAh g\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    with excellent capacity retention over 100 cycles at 0.1C and Coulombic efficiency exceeding 98.5%. Density functional theory calculations reveal that Mg incorporation enhances thermodynamic stability and increases the density of states near the Fermi level, indicating improved electronic conductivity. Furthermore, nudged elastic band calculations identify an ultralow Na\n                    <jats:sup>+<\/jats:sup>\n                    diffusion barrier of 0.113\u00a0eV, confirming favorable ion\u2010transport kinetics.\n                  <\/jats:p>","DOI":"10.1002\/smtd.71086","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T12:27:46Z","timestamp":1791376066000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Insights Into Mg\n                    <sup>2+<\/sup>\n                    \u2010Driven Lattice Stabilization and Na\n                    <sup>+<\/sup>\n                    Kinetics Regulation in O3\u2010Type NaMn\n                    <sub>0.5<\/sub>\n                    Fe\n                    <sub>0.5<\/sub>\n                    O\n                    <sub>2<\/sub>\n                    Cathodes for Sodium\u2010Ion Batteries"],"prefix":"10.1002","author":[{"given":"Faseeh Ul","family":"Zaman","sequence":"first","affiliation":[{"name":"Graduate School of Department of Energy Storage Conversion Engineering (BK21 FOUR) Jeonbuk National University  Jeonju Jeonbuk Republic of Korea"},{"name":"U.S. Pakistan for Advanced Studies in Energy National University of Sciences and Technology Islamabad Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saleem","family":"Sidra","sequence":"additional","affiliation":[{"name":"Graduate School of Department of Energy Storage Conversion Engineering (BK21 FOUR) Jeonbuk National University  Jeonju Jeonbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Van Hien","family":"Hoa","sequence":"additional","affiliation":[{"name":"Department of Nano Convergence Engineering Jeonbuk National University  Jeonju Jeonbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sang Won","family":"Lee","sequence":"additional","affiliation":[{"name":"Industrialization Division Korea Carbon Industry Promotion Agency (KCARBON)  Jeonju Jeonbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ghulam","family":"Ali","sequence":"additional","affiliation":[{"name":"U.S. Pakistan for Advanced Studies in Energy National University of Sciences and Technology Islamabad Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Do Hwan","family":"Kim","sequence":"additional","affiliation":[{"name":"Graduate School of Department of Energy Storage Conversion Engineering (BK21 FOUR) Jeonbuk National University  Jeonju Jeonbuk Republic of Korea"},{"name":"Department of Chemistry Education and Institute of Fusion Science Jeonbuk National University  Jeonju Jeonbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ensm.2020.04.040"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2023.114167"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2017.09.094"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1039\/C9CS00846B"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1088\/2631\u20107990\/abca84"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.energy.2024.131540"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/nchem.2085"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/cey2.29"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jechem.2022.11.031"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jechem.2023.04.029"},{"key":"e_1_2_9_12_1","doi-asserted-by":"crossref","first-page":"420","DOI":"10.1016\/j.ensm.2020.05.013","article-title":"A 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