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Different studies have reported an extra O 1s top (530-531 eV) at high voltages, that has been considered a direct trademark regarding the bulk oxygen redox process. Right here, we discover emergence of a 530.4 eV O 1s HAXPES peak for three model cathodes-Li2MnO3, Li-rich NMC, and NMC 442-that shows no clear backlink to air redox. Instead, the 530.4 eV peak for those three systems is attributed to transition steel reduction and electrolyte decomposition within the near-surface area. Statements of
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