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Here, we use all-atom molecular dynamics simulations to elucidate how cylindrical confinement regulates the structure and dynamics of poly(ethylene oxide) (PEO)-based electrolytes. Decreasing the nanotube diameter drives pronounced polymer chain segregation and reorganizes the spatial distribution of coordinating oxygen sites. This confinement-induced structural rearrangement markedly suppresses ion\u2013segment codiffusion along short chain segments and inhibits interchain hopping, leading to a substantial decrease in Li+ mobility. However, upon decreasing nanotube diameter, Li+\u2013EO coordination becomes stronger, which amplifies distinct cation\u2013cation correlations; this competition between slowed ion mobility and strengthened ion\u2013ion correlations gives rise to a nonmonotonic dependence of ionic conductivity on nanotube diameter. To disentangle geometric confinement from specific polymer electrolyte\u2013wall interactions, we perform control simulations with hard walls, where the hard wall provides only steric exclusion; these results confirm that the nonmonotonic trend cannot be explained by geometric confinement alone and instead requires the inclusion of specific polymer electrolyte\u2013wall interactions. Together, our results reveal the intricate coupling among confinement geometry, interfacial interactions, polymer organization, and ion transport, providing an atomistic basis for understanding ion transport in nanochannel-confined polymer electrolytes.<\/jats:p>","DOI":"10.1021\/acs.jpcb.6c04811","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T15:01:46Z","timestamp":1791298906000},"page":"11034-11044","source":"Crossref","is-referenced-by-count":0,"title":["Effect of Confinement\non Ion Transport in Polymer\nElectrolytes"],"prefix":"10.1021","volume":"130","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-0589-3577","authenticated-orcid":true,"given":"Di","family":"Xu","sequence":"first","affiliation":[{"name":"Institute of Chemistry, Chinese Academy of Sciences , , ,","place":["Beijing, P. R. China, 100190"]},{"name":"University of Chinese Academy of Sciences , ,","place":["Beijing, P. R. China, 100049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linbo","family":"Ma","sequence":"additional","affiliation":[{"name":"China Academy of Safety Science and Technology , ,","place":["Beijing, P. R. China, 100012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-1433-9560","authenticated-orcid":true,"given":"Zhixuan","family":"Zhong","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Chinese Academy of Sciences , , ,","place":["Beijing, P. R. China, 100190"]},{"name":"University of Chinese Academy of Sciences , ,","place":["Beijing, P. R. China, 100049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lifeng","family":"Xu","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Chinese Academy of Sciences , , ,","place":["Beijing, P. R. China, 100190"]},{"name":"University of Chinese Academy of Sciences , ,","place":["Beijing, P. R. China, 100049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruochao","family":"Wang","sequence":"additional","affiliation":[{"name":"SINOPEC Research Institute of Petroleum Processing Co., Ltd. , ,","place":["Beijing, P. R. China, 100083"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4171-5275","authenticated-orcid":true,"given":"Jian","family":"Jiang","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Chinese Academy of Sciences , , ,","place":["Beijing, P. R. China, 100190"]},{"name":"University of Chinese Academy of Sciences , ,","place":["Beijing, P. R. 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