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Herein, a copolymer electrolyte (RFPE) integrating a rigid styrene sulfonate (SS) backbone and flexible ethylene glycol methyl ether methacrylate (EGMEM) domains is developed to simultaneously achieve high mechanical robustness and fast Li\n                    <jats:sup>+<\/jats:sup>\n                    transport. The flexible EGMEM domains facilitate rapid Li\n                    <jats:sup>+<\/jats:sup>\n                    migration and enhanced chain mobility, while the rigid SS backbone provides mechanical reinforcement and stabilizes the electrode\/electrolyte interface. Benefiting from this synergistic and decoupled design, the RFPE\u20101.0 delivers a higher ionic conductivity of 8.42 \u00d7 10\n                    <jats:sup>\u22124<\/jats:sup>\n                    S cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    and a Li\n                    <jats:sup>+<\/jats:sup>\n                    transference number of 0.737 at 30\u00b0C. The RFPE\u20101.0 enables stable Li\/Li symmetric cell cycling for over 2800\u00a0hours and maintains 131.09 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    after 200 cycles at 0.5 C in LiFePO\n                    <jats:sub>4<\/jats:sub>\n                    full cells. Moreover, pouch cells further display stable output even under severe mechanical abuse. This work provides an effective strategy for designing high\u2010performance and safe polymer electrolytes for advanced LMBs.\n                  <\/jats:p>","DOI":"10.1002\/smll.76408","type":"journal-article","created":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T19:17:01Z","timestamp":1792696621000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Decoupling Mechanical Strength and Ion Transport in Copolymer Electrolytes for Stable Lithium Metal Batteries"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-1264-9827","authenticated-orcid":false,"given":"YuXun","family":"Yuan","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Research Institute of Frontier Science Key Laboratory of Advanced Technologies of Materials (Ministry of Education) Southwest Jiaotong University  Chengdu China"},{"name":"Institute of Atomic and Molecular Physics Sichuan 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