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Results obtained from synchrotron\u2010based hard X\u2010ray photoelectron spectroscopy and density functional theory (DFT) show that the oxidation state of O<jats:sup>2\u2212<\/jats:sup> ions is altered to higher oxidation states (O<jats:sup><jats:italic>\u03b4<\/jats:italic>\u2212<\/jats:sup>, <jats:italic>\u03b4<\/jats:italic>&lt;2) upon charging Li<jats:sub>3<\/jats:sub>Fe<jats:sub>2<\/jats:sub>(PO<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub> to 4.7\u2005V.<\/jats:p>","DOI":"10.1002\/cssc.201500752","type":"journal-article","created":{"date-parts":[[2015,9,7]],"date-time":"2015-09-07T06:42:27Z","timestamp":1441608147000},"page":"3213-3216","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Charge Localization in the Lithium Iron Phosphate Li<sub>3<\/sub>Fe<sub>2<\/sub>(PO<sub>4<\/sub>)<sub>3<\/sub> at High Voltages in Lithium\u2010Ion 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