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Here, we establish a reversible complexing strategy using branched polyethyleneimine (PEI) to construct coordination\u2010crosslinked PEI\u2010metal networks for retaining redox\u2010active species. Using Al\n                    <jats:sup>3+<\/jats:sup>\n                    as a model cation, the resulting PEI\/Al\n                    <jats:sup>3+<\/jats:sup>\n                    network effectively immobilizes anthraquinone molecules while maintaining their reversible electrochemical activity. The observed capacity evolution and charge\u2010discharge asymmetry are consistent with a possible state\u2010dependent retention process, although the identity and redox state of the migrating species are not directly resolved by the present measurements. Systematic comparison shows that coordination stability depends on cation\u2010specific aqueous coordination chemistry, with the Zn\n                    <jats:sup>2+<\/jats:sup>\n                    \u2010based complex exhibiting more dynamic and electrolyte\u2010sensitive behavior than the PEI\/Al\n                    <jats:sup>3+<\/jats:sup>\n                    network under the tested conditions. Extending this concept, PEI\u2010based complexes with redox\u2010active cations such as Mn\n                    <jats:sup>2+<\/jats:sup>\n                    and Cu\n                    <jats:sup>2+<\/jats:sup>\n                    directly function as electrode materials with long\u2010term cycling stability. Moreover, the coordination structures exhibit chemically responsive dissolution under chloride\u2010containing conditions, enabling the release of associated species. This work presents a functional proof\u2010of\u2010concept for coupling reversible polymer\u2010metal complexation with the association, electrochemical utilization, and chemically responsive release of redox\u2010active species.\n                  <\/jats:p>","DOI":"10.1002\/chem.71715","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T07:56:06Z","timestamp":1789718166000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reversible Complexing\u2010Enabled Coordination Networks for the Retention of Redox Species"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2288-4893","authenticated-orcid":false,"given":"Kaiqiang","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Energy Science and Engineering Nanjing Tech University  Nanjing Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-1757-1357","authenticated-orcid":false,"given":"Shengtao","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Energy Science and Engineering Nanjing Tech University  Nanjing Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoning","family":"Xi","sequence":"additional","affiliation":[{"name":"School of Energy Science and Engineering Nanjing Tech University  Nanjing Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinhan","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Energy Science and Engineering Nanjing Tech University  Nanjing Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0833-1205","authenticated-orcid":false,"given":"Yuping","family":"Wu","sequence":"additional","affiliation":[{"name":"Confucius Energy Storage Lab, School of Energy and Environment &amp; Z Energy Storage Center Southeast University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,18]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202107965"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41570\u2010023\u201000506\u2010w"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/aenm.202201692"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201906036"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202305546"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202108827"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41570\u2010024\u201000670\u20107"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41570\u2010025\u201000722\u20106"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.2c00215"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1039\/d4cs00474d"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201402975"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/smtd.202502381"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202520538"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41570\u2010023\u201000474\u20101"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1039\/d2gc02722d"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010026\u201070392\u20105"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/smtd.202401187"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.4c09352"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.2c00097"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja0708767"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202005270"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202414366"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202310245"}],"container-title":["Chemistry \u2013 A European Journal"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/chemistry-europe.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/chem.71715","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/chemistry-europe.onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/chem.71715","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/chemistry-europe.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/chem.71715","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T07:56:06Z","timestamp":1789718166000},"score":1,"resource":{"primary":{"URL":"https:\/\/chemistry-europe.onlinelibrary.wiley.com\/doi\/10.1002\/chem.71715"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,18]]},"references-count":23,"alternative-id":["10.1002\/chem.71715"],"URL":"https:\/\/doi.org\/10.1002\/chem.71715","archive":["Portico"],"relation":{},"ISSN":["0947-6539","1521-3765"],"issn-type":[{"value":"0947-6539","type":"print"},{"value":"1521-3765","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,18]]},"assertion":[{"value":"2026-07-22","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-09-15","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-09-18","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e71715"}}