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However, its practical energy density is restricted by the low operating potential of the Fe\n                    <jats:sup>2<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    \/Fe\n                    <jats:sup>3<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    redox couple. Partial substitution of Fe with Mn introduces the high\u2010voltage Mn\n                    <jats:sup>2<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    \/Mn\n                    <jats:sup>3<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    redox reaction, but simultaneously aggravates Jahn\u2013Teller distortion, sluggish reaction kinetics, and the competitive formation of maricite\u2010NaMPO\n                    <jats:sub>4<\/jats:sub>\n                    impurities. Herein, the transition\u2010metal (TM)\/Na\u2013P precursor ratio is systematically regulated to control competitive phase formation in Na\n                    <jats:sub>4<\/jats:sub>\n                    Fe\n                    <jats:sub>1<\/jats:sub>\n                    .\n                    <jats:sub>2<\/jats:sub>\n                    Mn\n                    <jats:sub>1<\/jats:sub>\n                    .\n                    <jats:sub>8<\/jats:sub>\n                    (PO\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    P\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    . The sample synthesized with a 3% reduction in the total Fe\/Mn precursor content (NMFPP\u20103) exhibits a substantially reduced maricite\u2010NaMPO\n                    <jats:sub>4<\/jats:sub>\n                    fraction of 2.1%. Suppression of maricite\u2010NaMPO\n                    <jats:sub>4<\/jats:sub>\n                    impurities reduces voltage polarization, facilitates Na\n                    <jats:sup>+<\/jats:sup>\n                    transport, mitigates Mn\n                    <jats:sup>3<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    \u2010induced Jahn\u2013Teller distortion and promotes highly reversible structural evolution. Consequently, NMFPP\u20103 delivers reversible discharge capacities of 105.5 and 85.0 mAh g\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    at 0.05 and 10 C, respectively, and retains 89.6% of its initial capacity after 200 cycles at 1 C. Moreover, the NMFPP\u20103\/\/hard\u2010carbon full cell achieves an energy density of 237.2\u00a0Wh kg\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    . These results demonstrate that precursor\u2010stoichiometry regulation provides a simple and effective strategy for suppressing competitive impurity formation and improving the structural and electrochemical reversibility of mixed\u2010transition\u2010metal phosphate cathodes.\n                  <\/jats:p>","DOI":"10.1002\/smll.75267","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T07:22:22Z","timestamp":1787210542000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Optimizing Metal\u2010Precursor Stoichiometry Toward Impurity\u2010Suppressed and Structurally Reversible Iron\u2013Manganese Phosphate Cathodes for Sodium\u2010Ion Batteries"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-3235-2349","authenticated-orcid":false,"given":"Taifan","family":"Yang","sequence":"first","affiliation":[{"name":"School of Chemical Engineering and Technology National Innovation Platform (Center) For Industry\u2010Education Integration of Energy Storage Technology State Key Laboratory of Fluorine &amp; Nitrogen Chemicals Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Beihang University  Beijing China"},{"name":"State Key Laboratory of Space Power Sources Shanghai Institute of Space Power\u2010Sources  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liang","family":"Xie","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Technology National Innovation Platform (Center) For Industry\u2010Education Integration of Energy Storage Technology State Key Laboratory of Fluorine &amp; Nitrogen Chemicals Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiawei","family":"Pan","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Technology National Innovation Platform (Center) For Industry\u2010Education Integration of Energy Storage Technology State Key Laboratory of Fluorine &amp; Nitrogen Chemicals Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weipeng","family":"Li","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Technology National Innovation Platform (Center) For Industry\u2010Education Integration of Energy Storage Technology State Key Laboratory of Fluorine &amp; Nitrogen Chemicals Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-1834-2690","authenticated-orcid":false,"given":"Wenxiang","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Technology National Innovation Platform (Center) For Industry\u2010Education Integration of Energy Storage Technology State Key Laboratory of Fluorine &amp; Nitrogen Chemicals Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kang","family":"Yang","sequence":"additional","affiliation":[{"name":"TOP Energy Digital Manufacturing (Xi'an) Technology Co., Ltd.  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