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However, voltage hysteresis exceeding 1\u00a0V, especially during the first cycle, remains a long\u2010standing and unresolved challenge, severely limiting energy efficiency and practical deployment. Here, we propose a quasi\u2010flat\u2010band framework in which oxygen 2p states near the Fermi level are intrinsically sensitive to perturbations. Even weak perturbations, such as minor lattice distortions during delithiation or thermal vibrations at room temperature, can disproportionately amplify band dispersion and induce hysteresis. This insight reframes the long\u2010standing design strategy by extending it beyond suppressing structural reconstructions to include control of perturbation\u2010driven electronic instability. Future materials design should pursue two principles: stabilizing symmetry to sustain quasi\u2010flat\u2010band characteristics and engineering orbital hybridization to enhance their robustness against perturbations. This work rethinks the origin and mitigation of voltage hysteresis, bringing oxygen\u2010redox cathodes closer to reliable operation at high voltages.\n                  <\/jats:p>","DOI":"10.1002\/adma.75396","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T06:43:47Z","timestamp":1792046627000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Voltage Hysteresis Induced by Fragile Quasi\u2010Flat Bands in Oxygen\u2010Redox Cathodes"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9513-9114","authenticated-orcid":false,"given":"Ang","family":"Gao","sequence":"first","affiliation":[{"name":"Institute of Environmental and Applied Chemistry College of Chemistry Central China Normal University  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuxuan","family":"Guo","sequence":"additional","affiliation":[{"name":"Institute of 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