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Previous approaches have relied on operational constraints to achieve desirable efficiency\u2014such as low temperatures (&lt;\u221240\u00a0\u00b0C) and\/or high charge\/discharge rates (&gt;5C)\u2014to mitigate chlorine evolution, but these strategies restrict areal capacity to &lt;1\u00a0mAh\u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and compromise practical viability. Here, we report a molecularly engineered Cl\n                    <jats:sup>\u2212<\/jats:sup>\n                    \/Cl\n                    <jats:sub>2<\/jats:sub>\n                    redox system stabilized by quaternary ammonium complexation in an acidic chloride electrolyte, enabling both high areal capacity (7\u00a0mAh\u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) and long charge\/discharge durations (\u223c7\u00a0h) with &gt;98% coulombic efficiency. The optimized tetraamylammonium chloride (TAACl) forms phase\u2010separated ionic liquid complexes (TAACl\n                    <jats:sub>3<\/jats:sub>\n                    and TAACl\n                    <jats:sub>5<\/jats:sub>\n                    ) with electrochemically generated Cl\n                    <jats:sub>2<\/jats:sub>\n                    , effectively suppressing chlorine volatilization, diffusion, and disproportionation. Paired with a MoO\n                    <jats:sub>3<\/jats:sub>\n                    anode that reversibly stores protons via intercalation, the MoO\n                    <jats:sub>3<\/jats:sub>\n                    \u2010TAACl full battery demonstrates robust performance across a wide temperature range (\u221245\u00a0to 40\u00a0\u00b0C). At 25\u00a0\u00b0C, the battery retains &gt;99% coulombic efficiency over 3000 cycles and maintains excellent cycling stability (&gt;1000 cycles) even at 40\u00a0\u00b0C. Electrolyte optimization with high\u2010concentration tetramethylammonium chloride (TMACl) and H\n                    <jats:sub>3<\/jats:sub>\n                    PO\n                    <jats:sub>4<\/jats:sub>\n                    further improves cycle life by enhancing redox kinetics and suppressing side reactions.\n                  <\/jats:p>","DOI":"10.1002\/anie.202515933","type":"journal-article","created":{"date-parts":[[2025,9,19]],"date-time":"2025-09-19T05:28:24Z","timestamp":1758259704000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Wide\u2010Temperature Operation of High\u2010Capacity Aqueous Chlorine Batteries Enabled by Complexation Chemistry"],"prefix":"10.1002","volume":"64","author":[{"given":"Wenjiao","family":"Ma","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing Joint International Research Laboratory of Energy Electrochemistry College of Chemistry and Chemical Engineering Hunan University  Changsha 410082 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing Joint International Research Laboratory of Energy Electrochemistry College of Chemistry and Chemical Engineering Hunan University  Changsha 410082 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunting","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing Joint International Research Laboratory of Energy Electrochemistry College of Chemistry and Chemical Engineering Hunan University  Changsha 410082 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengjun","family":"Lei","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing Joint International Research Laboratory of Energy Electrochemistry College of Chemistry and Chemical Engineering Hunan University  Changsha 410082 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinye","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing Joint International Research Laboratory of Energy Electrochemistry College of Chemistry and Chemical Engineering Hunan University  Changsha 410082 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruihong","family":"Pan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing Joint International Research Laboratory of Energy Electrochemistry College of Chemistry and Chemical Engineering Hunan University  Changsha 410082 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"He","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing Joint International Research Laboratory of Energy Electrochemistry College of 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