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During the charging process, the release of sodium ions leads to layer slip, which leads to the transformation of P<jats:sub>2<\/jats:sub> phase into O<jats:sub>2<\/jats:sub> phase, resulting in a sharp decline in capacity. However, many cathode materials do not undergo P<jats:sub>2<\/jats:sub>\u2010O<jats:sub>2<\/jats:sub> transition during charging and discharging, but form a \u201cZ\u201d phase. It is proved that the iron\u2010containing compound Na<jats:sub>0.67<\/jats:sub>Ni<jats:sub>0.1<\/jats:sub>Mn<jats:sub>0.8<\/jats:sub>Fe<jats:sub>0.1<\/jats:sub>O<jats:sub>2<\/jats:sub> formed the \u201cZ\u201d phase of the symbiotic structure of the P phase and O phase during high\u2010voltage charging through ex\u2010XRD and HAADF\u2010STEM. During the charging process, the cathode material undergoes a structural change of P<jats:sub>2<\/jats:sub>\u2010OP<jats:sub>4<\/jats:sub>\u2010O<jats:sub>2<\/jats:sub>. With the increase of charging voltage, the O\u2010type superposition mode increases to form an ordered OP4 phase, and the P<jats:sub>2<\/jats:sub>\u2010type superposition mode disappears after further charging to form a pure O<jats:sub>2<\/jats:sub> phase. <jats:sup>57<\/jats:sup>Fe\u2010M\u00f6ssbauer spectroscopy revealed that no migration of Fe ions is detected. The O\u2013Ni\u2013O\u2013Mn\u2013Fe\u2013O bond formed in the transition metal MO<jats:sub>6<\/jats:sub> (M = Ni, Mn, Fe) octahedron can inhibit the elongation of the Mn\u2013O bond and improve the electrochemical activity so that P2\u2010Na<jats:sub>0.67<\/jats:sub>Ni<jats:sub>0.1<\/jats:sub>Mn<jats:sub>0.8<\/jats:sub>Fe<jats:sub>0.1<\/jats:sub>O<jats:sub>2<\/jats:sub> has an excellent capacity of 172.4 mAh g<jats:sup>\u22121<\/jats:sup> and a coulombic efficiency close to 99% at 0.1C.<\/jats:p>","DOI":"10.1002\/smll.202208005","type":"journal-article","created":{"date-parts":[[2023,2,21]],"date-time":"2023-02-21T06:26:25Z","timestamp":1676960785000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":69,"title":["Properties of the \u201cZ\u201d\u2010Phase in Mn\u2010Rich P2\u2010Na<sub>0.67<\/sub>Ni<sub>0.1<\/sub>Mn<sub>0.8<\/sub>Fe<sub>0.1<\/sub>O<sub>2<\/sub> as Sodium\u2010Ion\u2010Battery Cathodes"],"prefix":"10.1002","volume":"19","author":[{"given":"Jie","family":"Feng","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Northeastern University  Shenyang 110819 P. 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