Visualization of O-O peroxo-like dimers in high-capacity layered oxides for Li-ion batteries

Eric McCalla, Artem M. Abakumov, Matthieu Saubanère, Dominique Foix, Erik J. Berg, Gwenaelle Rousse, Marie Liesse Doublet, Danielle Gonbeau, Petr Novák, Gustaaf Van Tendeloo, Robert Dominko, Jean Marie Tarascon

Research output: Contribution to journalArticlepeer-review

643 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1516-1521
Number of pages6
Issue number6267
StatePublished - Dec 18 2015


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