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Herein, nonstoichiometric copper telluride (Cu<jats:sub>2\u2010x<\/jats:sub>Te) nanosheets are first explored as high\u2010performance electrodes for acidic batteries to provide a stable capacity release of 409 mAh g<jats:sup>\u22121<\/jats:sup> with a record\u2010breaking lifespan of 40\u00a0000 cycles and excellent kinetics, enabling operation at a high current density of 20 A g<jats:sup>\u22121<\/jats:sup>. In contrast to the inherent perception of corrosive destruction of electrode materials by strongly acidic environments, the electrolyte environment enriched with copper ions and hydrogen ions synergistically stabilizes the Cu<jats:sub>2\u2010x<\/jats:sub>Te electrode and drives reversible multielectron transfer asymmetric deep conversion, which is confirmed by in situ synchrotron X\u2010ray diffraction, X\u2010ray absorption spectroscopy, first\u2010principal calculations, and composite electrochemical characterization. Therefore, Cu<jats:sub>2\u2010x<\/jats:sub>Te provides an impressive accumulation capacity of over 4764 Ah g<jats:sup>\u22121<\/jats:sup>, exceeding that of most acidic batteries, and works well at \u221220\u00a0\u00b0C. High\u2010performance Cu<jats:sub>2\u2010x<\/jats:sub>Te electrodes also promote the establishment of Cu<jats:sub>2\u2010x<\/jats:sub>Te\/\/Mn<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> and Cu<jats:sub>2\u2010x<\/jats:sub>Te\/\/Fe acidic full cells enabling stable operation at room temperature and low temperature, offering promising opportunities for electrode progress in advanced acidic batteries.<\/jats:p>","DOI":"10.1002\/adma.202414869","type":"journal-article","created":{"date-parts":[[2025,4,4]],"date-time":"2025-04-04T20:43:12Z","timestamp":1743799392000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Tailoring Synergistic Ion Environment for Copper Telluride toward High\u2010Capacity and Ultrastable Acidic Multivalent\u2010Ion Batteries"],"prefix":"10.1002","volume":"37","author":[{"given":"Yuanhe","family":"Sun","sequence":"first","affiliation":[{"name":"Shanghai Synchrotron Radiation Facility, 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