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Here, we introduce an ether\u2010based complexation strategy that stabilizes interhalogen species and mitigates cross\u2010talk degradation in aqueous two\u2010electron Zn\u2013I\n                    <jats:sub>2<\/jats:sub>\n                    batteries. Density functional theory calculations and spectroscopic analyses reveal the selective formation of an ICl\u201315\u2010crown\u20105 (15C5) complex among various linear and cyclic ethers. The electron\u2010deficient iodine center in ICl is coordinated by electron\u2010rich oxygen atoms in 15C5 through lone\u2010pair donor\u2013acceptor interactions. In situ UV\u2013vis spectroscopy, distribution of relaxation times analysis, intrinsic reaction coordinate calculations, and real\u2010time pH monitoring collectively demonstrate that ICl\u201315C5 complexation effectively suppresses ICl hydrolysis. Consequently, the 15C5\u2010containing electrolyte shows stable capacity retention over 1000 cycles at 1000 mA g\n                    <jats:sup>\u22121<\/jats:sup>\n                    with high Coulombic efficiency in coin cells, and sustains pouch\u2010type cell operation with a high discharge capacity of approximately 350 mA h g\n                    <jats:sup>\u22121<\/jats:sup>\n                    over 150 cycles. This work identifies cross\u2010talk degradation driven by ICl hydrolysis as a critical bottleneck in two\u2010electron Zn\u2013I\n                    <jats:sub>2<\/jats:sub>\n                    batteries and establishes interhalogen complexation as an effective electrolyte design strategy for high\u2010energy, long\u2010lifetime aqueous iodine\u2010based batteries.\n                  <\/jats:p>","DOI":"10.1002\/smll.75496","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T07:47:13Z","timestamp":1788335233000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Interhalogen Complexation Suppresses Hydrolysis\u2013Corrosion Cross\u2010Talk Degradation in Aqueous Two\u2010Electron Zn\u2013I\n                    <sub>2<\/sub>\n                    Batteries"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-0608-2659","authenticated-orcid":false,"given":"Hyeonbin","family":"Kim","sequence":"first","affiliation":[{"name":"School of Chemical and Biological Engineering Institute of Chemical Processes Institute of Engineering Research Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-8548-315X","authenticated-orcid":false,"given":"Seung Weon","family":"Jeong","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Materials Science Ewha Womans University  Seoul Republic of Korea"},{"name":"Graduate Program in System Health Science and Engineering Ewha Womans University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Duk Hyung","family":"Jo","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering Institute of Chemical Processes Institute of Engineering Research Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinkyu","family":"Byun","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering Institute of Chemical Processes Institute of Engineering Research Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eun Ji","family":"Joo","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering Institute of Chemical Processes Institute of Engineering Research Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beomtak","family":"Na","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering Institute of Chemical Processes Institute of Engineering Research Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyunseo","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering Institute of Chemical Processes Institute of Engineering Research Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4649-9594","authenticated-orcid":false,"given":"Xiulei","family":"Ji","sequence":"additional","affiliation":[{"name":"Department of Chemistry Oregon State University  United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1725-3226","authenticated-orcid":false,"given":"Sangheon","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Materials Science Ewha Womans University  Seoul Republic of Korea"},{"name":"Graduate Program in System Health Science and Engineering Ewha Womans University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2769-3372","authenticated-orcid":false,"given":"Kyu Tae","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering Institute of Chemical Processes Institute of Engineering Research Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,2]]},"reference":[{"key":"e_1_2_9_2_1","unstructured":"I. 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