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Instead of restoring reversible electrochemical activity, we develop a universal reversible\u2010to\u2010sacrificial strategy that converts spent cathode materials into transition metal\/Li\n                    <jats:sub>2<\/jats:sub>\n                    O nanocomposites as efficient sacrificial lithium sources with negligible gas evolution during initial charge. This transformation is achieved by coating spent cathode powders onto commercial separators, followed by contact lithiation with thick lithium foil at room temperature, creating a lithium\u2010donating separator. Unlike conventional direct\u2010contact prelithiation methods relying on ultrathin lithium foils that are difficult to fabricate and handle and may damage electrodes, our separator\u2010based approach enables the use of thick lithium foil while avoiding electrode degradation. Full cells incorporating this functional separator exhibit markedly improved electrochemical performance, especially reversible capacity and cycling stability. Moreover, the modified separator enhances cell resilience under zero\u2010voltage storage and over\u2010discharge conditions by serving as a lithium buffer, stabilizing the absolute potentials of both electrodes against detrimental deviation. This strategy is applicable to representative cathode chemistries and mixed cathode waste streams, providing a scalable route for battery recycling and lithium replenishment.\n                  <\/jats:p>","DOI":"10.1002\/adma.74514","type":"journal-article","created":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T08:05:46Z","timestamp":1786003546000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Universal Upcycling of Spent Cathodes Into Lithium Donors for High\u2010Performance and Resilient Batteries"],"prefix":"10.1002","volume":"38","author":[{"given":"Ganxiong","family":"Liu","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Tongji University  Shanghai China"},{"name":"School of Automotive Studies Tongji University  Shanghai 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