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Here, a low\u2010salt binary electrolyte composed of dimethoxyethane (DME) and tetrahydrofuran (THF) is reported, in which the cyclic ether effectively regulates the solvation structure to enhance both interfacial stability and Na\n                    <jats:sup>+<\/jats:sup>\n                    transport. Molecular dynamics simulations and spectroscopic analyses reveal that THF incorporation promotes contact ion pair\u2013dominated coordination, even at low salt concentrations. This tailored solvation environment drives the formation of a thin, NaF\u2010rich SEI with high mechanical robustness and ionic conductivity, suppressing Sn foil expansion and enabling homogeneous Na\n                    <jats:sup>+<\/jats:sup>\n                    infusion into the bulk. As a result, Sn||Na half\u2010cells achieve exceptional cycling stability\u2014up to 8\u00a0920 cycles at 1 mAh cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    with 99.95% Coulombic efficiency, alongside robust performance at 3 and 10 mAh cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Full cells with 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>3<\/jats:sub>\n                    cathodes further demonstrate long\u2010term stability and high retention. This study establishes solvation engineering as a powerful strategy for electrolyte design, enabling durable alloy foil anodes and advancing the practical deployment of high\u2010performance SIBs.\n                  <\/jats:p>","DOI":"10.1002\/smll.202512356","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T06:58:40Z","timestamp":1763535520000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Binary Solvation Engineering Unlocks Ultra\u2010Stable Cycling of Alloy Foil Anodes in Sodium\u2010Ion Batteries"],"prefix":"10.1002","volume":"22","author":[{"given":"Yifan","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Material Science and Engineering \u201cThe Belt and Road Initiative\u201d Advanced Materials International Joint Research Center of Hebei Province Hebei University of Technology  Tianjin 300130 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University of Technology  Tianjin 300130 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mirtemir","family":"Kurbanov","sequence":"additional","affiliation":[{"name":"Arifov Institute of Ion\u2010Plasma and Laser Technologies Academy of Sciences of the Republic of Uzbekistan  Tashkent 100077 Uzbekistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Material Science and Engineering \u201cThe Belt and Road Initiative\u201d Advanced Materials International Joint Research Center of Hebei Province Hebei University of Technology  Tianjin 300130 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3589-9020","authenticated-orcid":false,"given":"Gongkai","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Material Science and Engineering \u201cThe Belt and Road Initiative\u201d Advanced Materials 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