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The preparation of high\u2010performance ultrathin magnesium foil negative electrode is crucial for achieving high\u2010energy\u2010density magnesium batteries. Electrodeposition has proven to be an effective method for producing ultrathin magnesium foil, but the uniformity and density of electrodeposited magnesium foil still need to be further optimized. This study systematically screens long\u2010chain quaternary ammonium salt as electrodeposition additives and discovers that cetyltrimethylammonium bromide (CTAB) effectively induces the formation of magnesium deposits with lower surface roughness and higher structural density. Combining density functional theory calculations and systematic experimental characterizations, the mechanism of CTAB additive is demonstrated as that CTA\n                    <jats:sup>+<\/jats:sup>\n                    ions adsorb at the electrode interface to regulate the magnesium nucleation\u2010growth process, thereby achieving more uniform deposition morphology. The optimized magnesium negative electrode delivers a cycle life of 500\u00a0h at 5\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and 5 mAh cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    (83.3% utilization rate) with an overpotential of only 0.18\u00a0V, and the Mg||Mo\n                    <jats:sub>6<\/jats:sub>\n                    S\n                    <jats:sub>8<\/jats:sub>\n                    full cell maintains a capacity of 79.1 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    after 500 cycles. This study provides a pathway for designing and fabricating high\u2010utilization, long\u2010cycle\u2010life magnesium metal negative electrode.\n                  <\/jats:p>","DOI":"10.1002\/smtd.71104","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T09:51:44Z","timestamp":1791366704000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Uniform and Dense Electrodeposited Magnesium Foil Induced by Cationic Surfactant Additive as an Ultra\u2010Thin and High\u2010Utilization Negative Electrode for Rechargeable Magnesium Batteries"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-9309-2177","authenticated-orcid":false,"given":"Can","family":"Liu","sequence":"first","affiliation":[{"name":"College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, National Innovation Center For Industry\u2010Education Integration of Energy Storage Technology Chongqing University  Chongqing China"},{"name":"Institute of New Energy Storage Materials and Equipment Mingyue Lake Laboratory  Chongqing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-8566-1371","authenticated-orcid":false,"given":"Shutong","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, National Innovation Center For Industry\u2010Education Integration of Energy Storage Technology Chongqing University  Chongqing China"},{"name":"Institute of New Energy Storage Materials and Equipment Mingyue Lake Laboratory  Chongqing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-2461-1083","authenticated-orcid":false,"given":"Peiyuan","family":"Jiao","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, National Innovation Center For Industry\u2010Education Integration of Energy Storage Technology Chongqing University  Chongqing China"},{"name":"Institute of New Energy Storage Materials and Equipment Mingyue Lake Laboratory  Chongqing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Song","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, National Innovation Center For Industry\u2010Education Integration of Energy Storage Technology Chongqing University  Chongqing China"},{"name":"Institute of New Energy Storage Materials and Equipment Mingyue Lake Laboratory  Chongqing 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