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Na\u2010ion batteries are a promising alternative to Li\u2010based analogues thanks to low cost, abundance of constituents, and an already set\u2010up industry. However, already commercialized positive electrode materials for Na\u2010ion batteries (Na\n                    <jats:sub>3<\/jats:sub>\n                    V\n                    <jats:sub>2<\/jats:sub>\n                    (PO\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    F\n                    <jats:sub>3<\/jats:sub>\n                    and Na\n                    <jats:sub>x<\/jats:sub>\n                    Cu\n                    <jats:sub>1\u2010y\u2010z<\/jats:sub>\n                    Fe\n                    <jats:sub>y<\/jats:sub>\n                    Mn\n                    <jats:sub>z<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    ) contain critical raw elements such as V, Cu, and Mn, boosting the research towards abundant Fe\u2010based materials. In this work, we report a novel sodium iron sulfate phase, Na\n                    <jats:sub>2<\/jats:sub>\n                    Fe\n                    <jats:sub>3<\/jats:sub>\n                    (SO\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    (NFS), synthesized by ball milling, as a positive electrode material. This new compound crystallizes in the orthorhombic\n                    <jats:italic>Pbca<\/jats:italic>\n                    space group with cell parameters\n                    <jats:italic>a<\/jats:italic>\n                    = 9.682(1) \u00c5,\n                    <jats:italic>b<\/jats:italic>\n                    = 8.739(1) \u00c5,\n                    <jats:italic>c<\/jats:italic>\n                    = 29.300(4) \u00c5, and\n                    <jats:italic>V<\/jats:italic>\n                    = 2479.0(5) \u00c5\n                    <jats:sup>3<\/jats:sup>\n                    . Tests of thick NFS positive electrodes (18 mg cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) in Na\u2010half coin cells delivered 62 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at C\/30 (corresponding to the exchange of 2 e\u2010) or 69% of the theoretical capacity (90 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), with a good capacity retention of 47 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at a high discharge rate 2C.\n                    <jats:italic>Operando<\/jats:italic>\n                    X\u2010ray diffraction (XRD) showed minimal (&lt;1%) changes in lattice parameters during cycling. Dominantly octahedra coordinated iron atoms are oxidized\/reduced, as confirmed by\n                    <jats:italic>operando<\/jats:italic>\n                    synchrotron M\u00f6ssbauer spectroscopy.\n                  <\/jats:p>","DOI":"10.1002\/anie.202511285","type":"journal-article","created":{"date-parts":[[2025,9,13]],"date-time":"2025-09-13T12:11:08Z","timestamp":1757765468000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Na\n                    <sub>2<\/sub>\n                    Fe\n                    <sub>3<\/sub>\n                    (SO\n                    <sub>4<\/sub>\n                    )\n                    <sub>4<\/sub>\n                    : A Zero\u2010Strain Sustainable Positive Electrode Material for Na\u2010Ion Batteries"],"prefix":"10.1002","volume":"64","author":[{"given":"Anastasia","family":"Grebenshchikova","sequence":"first","affiliation":[{"name":"Univ. 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