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Herein, trace tetraethylenepentamine (TEP), with a high\u2010density N\u2010H proton array, is employed to regulate the running environment of Zn\u2010I\n                    <jats:sub>2<\/jats:sub>\n                    batteries, which suppresses anode corrosion and polyiodide formation, enabling long\u2010term cycling under high\u2010loading conditions. For the zinc anode, TEP's high\u2010density N\u2010H array facilitates preferential surface adsorption, optimizing the interfacial Helmholtz layer. Rich in lone\u2010pair electrons, its \u2010NH\n                    <jats:sub>2<\/jats:sub>\n                    and \u2010NH\u2010 groups as Lewis bases coordinate with Zn\n                    <jats:sup>2+<\/jats:sup>\n                    ions to regulate interfacial ion dynamics, enabling dendrite\u2010free Zn deposition. For the iodine cathode, TEP coordinates with I\n                    <jats:sub>2<\/jats:sub>\n                    via the lone pair electrons of N atoms and forms strong electrostatic hydrogen bonds between H protons and I\n                    <jats:sup>\u2212<\/jats:sup>\n                    , synergistically suppressing polyiodides formation, thereby enhancing the utilization of the iodine cathode. Consequently, TEP enables the Zn||Zn battery to achieve a stable cycling for over 2333\u00a0h (1\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , 1 mAh cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    ). The Zn\u2010I\n                    <jats:sub>2<\/jats:sub>\n                    battery with a high iodine loading (15.9\u00a0mg cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) retains 91.3% capacity after 8900 cycles. This study demonstrates that incorporating a trace amount of TEP provides a new insight into the development of sustainable, long\u2010life Zn\u2010I\n                    <jats:sub>2<\/jats:sub>\n                    batteries.\n                  <\/jats:p>","DOI":"10.1002\/smll.202514273","type":"journal-article","created":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T14:24:32Z","timestamp":1768487072000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Polyamine Compound with High\u2010Density N\u2010H Proton Arrays Enables High\u2010Loading and Long Lifespan Zinc\u2010Iodine Batteries"],"prefix":"10.1002","volume":"22","author":[{"given":"Yanzi","family":"Deng","sequence":"first","affiliation":[{"name":"State Key Laboratory of Powder Metallurgy Central South University  Changsha P. R. 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