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Title
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Visualization of O-O peroxo-like dimers in high-capacity layered oxides for Li-ion batteries
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Author
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Abstract
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| Lithium-ion (Li-ion) batteries that rely on cationic redox reactions are the primary energy source for portable electronics. One pathway toward greater energy density is through the use of Li-rich layered oxides. The capacity of this class of materials (>270 milliampere hours per gram) has been shown to be nested in anionic redox reactions, which are thought to form peroxo-like species. However, the oxygen-oxygen (O-O) bonding pattern has not been observed in previous studies, nor has there been a satisfactory explanation for the irreversible changes that occur during first delithiation. By using Li2IrO3 as a model compound, we visualize the O-O dimers via transmission electron microscopy and neutron diffraction. Our findings establish the fundamental relation between the anionic redox process and the evolution of the O-O bonding in layered oxides. |
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Language
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English
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Source (journal)
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Science / American Association for the Advancement of Science [Washington, D.C.] - Washington, D.C., 1880, currens
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Publication
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Washington, D.C.
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American Association for the Advancement of Science
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2015
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ISSN
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0036-8075
[print]
1095-9203
[online]
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DOI
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10.1126/SCIENCE.AAC8260
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Volume/pages
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350
:6267
(2015)
, p. 1516-1521
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ISI
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000366591100056
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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