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Although aqueous halogen redox systems are attractive due to their high redox potentials and intrinsic safety, most reported configurations still depend on concentrated metal salt electrolytes and\/or metal anodes, limiting their sustainability. Here, we develop a completely metallic element\u2010free halide\u2010ion aqueous battery composed of a reduced graphene oxide (rGO) cathode, a viologen\u2010based organic anode (TF\u2010Cl), and a dual\u2010halide hydrogel electrolyte. Incorporation of bromide and chloride species with distinct quaternary ammonium cations into a xanthan gum matrix establishes a confined ionic environment that stabilizes reactive polyhalide intermediates and suppresses shuttle behavior. Bromide\u2013chloride interactions further regulate chlorine redox pathways, enabling cooperative stepwise halogen reactions with improved reversibility. Mechanistic studies indicate stabilized polyhalide formation and intercalation at the rGO cathode, together with reversible chloride storage at nitrogen redox sites in TF\u2010Cl. The assembled full battery exhibits a stable discharge plateau, good rate capability, and cycling stability over 2000 cycles, demonstrating competitive capacity and enhanced output voltage relative to representative aqueous systems with metal\u2010free electrodes.<\/jats:p>","DOI":"10.1002\/adma.73524","type":"journal-article","created":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T06:36:13Z","timestamp":1780036573000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A Metallic Element\u2010Free Halide\u2010Ion Battery Enabled by Dual\u2010halide Regulation in a Hydrogel Electrolyte"],"prefix":"10.1002","volume":"38","author":[{"given":"Zhiyang","family":"Xue","sequence":"first","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites College of Materials Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhengyuan","family":"Gao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites College of Materials Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kangjie","family":"Xu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites College of Materials Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fenglin","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites College of Materials Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianglong","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites College of Materials Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenhao","family":"Lin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites College of Materials Science and Engineering Nanjing Tech University  Nanjing 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