{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T16:03:50Z","timestamp":1786637030039,"version":"build-2736575974"},"reference-count":49,"publisher":"Wiley","issue":"45","license":[{"start":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T00:00:00Z","timestamp":1782259200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T00:00:00Z","timestamp":1782259200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"published-print":{"date-parts":[[2026,8]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Lithium\u2013sulfur (Li\u2013S) batteries suffer from severe capacity fading due to the dissolution and shuttle diffusion of lithium polysulfide (LiPS). Although separator regulation that relies on pore confinement can effectively suppress polysulfide migration, its coupled influence on lithium\u2010ion (Li\n                    <jats:sup>+<\/jats:sup>\n                    ) transport kinetics remains poorly understood. Herein, covalent organic frameworks (COFs) with continuously tunable pore are used as a model system by introducing oligo(ethylene glycol) (OEG) chains of varying lengths. A series of OEG\n                    <jats:sub>n<\/jats:sub>\n                    COFs (\n                    <jats:italic>n<\/jats:italic>\n                    = 0 \u2013 3) which share identical backbone topology while differing only in side\u2010chain length, provide a well\u2010defined platform for precisely modulating the pore. Confinement induced by side\u2010chains monotonically suppresses polysulfide migration, whereas Li\n                    <jats:sup>+<\/jats:sup>\n                    transport shows a pronounced nonmonotonic dependence on side\u2010chain length. Excessively long side\u2010chains impose highly fluctuating steric constraints that disrupt continuous lithium\u2010ion transport, while OEG\n                    <jats:sub>2<\/jats:sub>\n                    COF achieves an optimal balance, delivering the lowest migration barrier and improved rate capability and cycling stability. This work elucidates, from a model perspective, the competitive interplay among pore confinement, steric effects, and ion transport kinetics, offering insights for the rational design of high\u2010performance separators for Li\u2013S batteries.\n                  <\/jats:p>","DOI":"10.1002\/smll.74288","type":"journal-article","created":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T11:44:13Z","timestamp":1782301453000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Engineering Side\u2010Chain Steric Effects to Build Selective COF Channels for Polysulfide Suppression in Li\u2013S Batteries"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1004-1602","authenticated-orcid":false,"given":"Weikun","family":"Chen","sequence":"first","affiliation":[{"name":"College of Chemistry and Chemical Engineering Central South University  Changsha 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