Visualization of O-O peroxo-like dimers in high-capacity layered oxides for Li-ion batteries
- 18 December 2015
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 350 (6267), 1516-1521
- https://doi.org/10.1126/science.aac8260
Abstract
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.Funding Information
- European Research Council (ERC) (FP/2014-2020)
- ERC (Grant-Project670116-ARPEMA)
- Slovenian Research Agency
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (DE-AC02-06CH11357)
- GENCI-CCRT/CINES (cmm6691)
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