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Here, we design a molecular capsule formed by dimeric 4\u2010tert\u2010butylcalix[8]arene (TBC8). Due to their similar hydrophobic properties, the redox\u2010active molecules (metal acetylacetonates) tend to be enriched in the cavities with tert\u2010butyl groups of the formed capsules, which enables a several\u2010fold enhanced solubility of redox\u2010active species, compared with the system without TBC8. By using the electrolytes containing encapsulated redox species, the constructed non\u2010aqueous redox flow battery shows a capacity retention of 90.41% after 1000 cycles, much better than that of the device (52.2% after 400 cycles) without using TBC8 capsules. This work demonstrates a promising strategy to design novel electrolytes containing sensitive redox\u2010active species toward high\u2010performance flow batteries with long\u2010term stability.<\/jats:p>","DOI":"10.1002\/smll.76120","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T11:03:53Z","timestamp":1791284633000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Molecular Capsule to Confine Redox\u2010Active Metal Acetylacetonate Complex for Long\u2010Lifetime Non\u2010Aqueous Redox Flow Battery"],"prefix":"10.1002","author":[{"given":"Quanhu","family":"Sun","sequence":"first","affiliation":[{"name":"Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and Engineering Tongji University  Shanghai People's Republic of 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