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However, their practical application is hindered by sluggish solid\u2010solid sulfur conversion kinetics and the persistent need for soluble iodine redox mediators that exacerbate zinc anode corrosion and dendrite formation. Here, we report an integrated polymer\u2013polyiodide confinement strategy employing a cationic poly(vinyl butyl imidazolium iodide) framework ([PVIM]I) complexed with iodine to form a redox\u2010active polymer\u2010polyiodide framework ([PVIM]I\n                    <jats:sub>x<\/jats:sub>\n                    ). The polymer matrix spatially confines polyiodide species, minimizing their crossover and suppressing zinc anode corrosion while enhancing sulfur redox kinetics. The resulting metal\u2010free and binder\u2010free ([PVIM]I\n                    <jats:sub>x<\/jats:sub>\n                    ) cathode delivers a high specific capacity of 1845 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    (1548 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    excluding iodine contribution) at 0.1 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    with an energy density of 923 Wh kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    , maintaining excellent cycling stability with 93.7% capacity retention over 500 cycles at 5 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Improved ion diffusion and reduced polarization were confirmed by GITT and in situ impedance spectroscopy. This polymer\u2010iodide composite provides a scalable and stable platform for advancing aqueous Zn\/S batteries, addressing key challenges in cathode wettability and redox mediation to enable sustainable, high\u2010performance energy storage solutions.\n                  <\/jats:p>","DOI":"10.1002\/smll.202514556","type":"journal-article","created":{"date-parts":[[2026,1,29]],"date-time":"2026-01-29T07:25:24Z","timestamp":1769671524000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Confining Polyiodide in Polymer Cathode Boosts Cycling Stability in High Energy\u2010Dense Aqueous Zinc\u2010Sulfur Batteries"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-6447-8655","authenticated-orcid":false,"given":"Tino S.","family":"Thomas","sequence":"first","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Ropar  Rupnagar Punjab India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6032-2296","authenticated-orcid":false,"given":"Aayushi Prakash","family":"Sinha","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Ropar  Rupnagar Punjab India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4701-543X","authenticated-orcid":false,"given":"Debaprasad","family":"Mandal","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Ropar  Rupnagar Punjab 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