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While improving initial Coulombic efficiency (ICE), low\u2010current activation accelerates progressive capacity decay over extended cycling and prevents fast\u2010charging. Furthermore, conventional nanostructuring operates on a paradigm of mere passive containment, leaving root electrochemical instabilities fundamentally unresolved. Inspired by butterfly metamorphosis, we introduce a biomimetic electrochemical paradigm. Analogous to endogenous enzymes driving transformation within a protective cocoon, we employ an initial high current as an \u201celectrochemical enzyme\u201d to trigger the controlled size reduction of Si confined within a covalent organic framework (COF) \u201ccocoon.\u201d Regulated by this architecture, the high\u2010current pulse drives controlled Si pulverization, synchronously realizing in situ pre\u2010lithiation and generating a stable amorphous Li\u2010Si phase via a comprehensively elucidated synergistic mechanism. Benefiting from this structural evolution, the engineered anode exhibits superior robustness. It retains 74.5% and 71.9% capacity over 2000 cycles at 10\u00a0000 and 20\u00a0000 mA g\n                    <jats:sup>\u22121<\/jats:sup>\n                    , respectively, and successfully accommodates extreme fast charging (118 s). By conceptualizing a transition from passive containment to active in situ regulation, this study unveils a transformative design paradigm for high\u2010energy, high\u2010power battery materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.3879325","type":"journal-article","created":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T07:21:40Z","timestamp":1787728900000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["From Passive Cocoon to Active Metamorphosis: High\u2010Current\u2010Driven Evolution of Silicon for Ultrastable Anodes"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8983-6212","authenticated-orcid":false,"given":"Kaixiang","family":"Chen","sequence":"first","affiliation":[{"name":"Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry, Sun Yat\u2010Sen University  Guangzhou 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