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Although porous host materials have been preliminarily explored, the effect of pore size on Cl\n                    <jats:sub>2<\/jats:sub>\n                    confinement and electrochemical behavior still remains unclear. Herein, two novel covalent organic frameworks (COFs) with distinct pore sizes, namely TH\u2010COF (mesoporous, 2.7 nm) and HH\u2010COF (microporous, 0.9 nm), were fabricated by reacting triphenylene\u20102,3,6,7,10,11\u2010hexacarboxylic acid with 3\u2010 and 6\u2010connected amines, respectively, to serve as a model system for elucidating the pore\u2010size effect in Li\u2010Cl\n                    <jats:sub>2<\/jats:sub>\n                    batteries. Owing to its smaller pore size and resultant stronger spatial confinement, the microporous HH\u2010COF enables superior Cl\n                    <jats:sub>2<\/jats:sub>\n                    capture and markedly enhanced battery performance, as exemplified by a high capacity of 4500 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    , a high current density of 10 000 mA g\n                    <jats:sup>\u22121<\/jats:sup>\n                    , and a Coulombic efficiency (CE) above 94% for each of the 500 cycles, outperforming its mesoporous TH\u2010COF counterpart and all previously reported electrodes. Density functional theory calculations reveal stronger host\u2010guest interactions between Cl\n                    <jats:sub>2<\/jats:sub>\n                    and the microporous HH\u2010COF than its mesoporous counterpart TH\u2010COF. This study not only clarifies the pivotal role of pore\u2010size engineering in Li\u2010Cl\n                    <jats:sub>2<\/jats:sub>\n                    batteries but also establishes a rational design principle for developing high\u2010performance Cl\n                    <jats:sub>2<\/jats:sub>\n                    host cathodes.\n                  <\/jats:p>","DOI":"10.1002\/adma.74624","type":"journal-article","created":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T05:34:07Z","timestamp":1786599247000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Pore Engineering of Covalent Organic Frameworks Boosts Chlorine Confinement and Electrochemical Performance in Li\u2500Cl\n                    <sub>2<\/sub>\n                    Batteries"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-0154-540X","authenticated-orcid":false,"given":"Ziyi","family":"Li","sequence":"first","affiliation":[{"name":"Key Laboratory of Functional Molecular Solids of Ministry of Education Anhui Basic Discipline Research Center for Clean Energy and Catalysis College of Chemistry and Molecular Sciences Anhui Normal University  Wuhu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zongyi","family":"Zhou","sequence":"additional","affiliation":[{"name":"Key Laboratory of Functional Molecular Solids of Ministry of Education Anhui Basic Discipline Research Center for Clean Energy and Catalysis College of Chemistry and Molecular Sciences Anhui Normal University  Wuhu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaxin","family":"Qin","sequence":"additional","affiliation":[{"name":"Key Laboratory of Functional Molecular Solids of Ministry of Education Anhui 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