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This study develops a polyanionic hydrogel electrolyte, poly(2\u2010acrylamido\u20102\u2010methyl\u20101\u2010propanesulfonic acid\u2010co\u2010acrylamide) (P(AMPS\u2010co\u2010AM)), featuring a dense porous structure that\u00a0enables a higher Zn\n                    <jats:sup>2+<\/jats:sup>\n                    transference number (t\n                    <jats:sub>Zn<\/jats:sub>\n                    <jats:sup>2+<\/jats:sup>\n                    = 0.81) and homogeneous zinc deposition. Additionally, the dense porous structure further reduces the proportion of free water molecules, thereby suppressing side reactions. Based on the benefits of the hydrogel, the Zn||Zn symmetric cell demonstrates over 3000 h of continuous cycling, and the Zn||Cu asymmetric cell exhibits an exceptional Coulombic efficiency of 99.29% in the first cycle. Benefiting from the fixation of transition metals by polyanionic groups and the reduced content of free water molecules within a densely packed porous architecture, the PBA||Zn full cell achieves a high energy density of 267\u00a0Wh kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This hydrogel electrolyte design strategy provides significant insights for achieving long cycle life through both the microscale and macroscale structure design to achieve low cost and high energy density of aqueous zinc\u2010metal batteries (AZMBs).\n                  <\/jats:p>","DOI":"10.1002\/smll.202503565","type":"journal-article","created":{"date-parts":[[2025,5,23]],"date-time":"2025-05-23T03:50:23Z","timestamp":1747972223000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Micro\u2013Macro Hierarchical Hydrogel Architectures with Dual\u2010Scale Polyanionic Networks for High Energy Density PBA||Zn Batteries"],"prefix":"10.1002","volume":"21","author":[{"given":"Gege","family":"Wang","sequence":"first","affiliation":[{"name":"Shanghai Institute of Ceramics Chinese Academy of Sciences  Shanghai 200050 China"},{"name":"University of Chinese Academy of Sciences  Beijing 100049 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