TY - JOUR
T1 - Visualization of O-O peroxo-like dimers in high-capacity layered oxides for Li-ion batteries
AU - McCalla, Eric
AU - Abakumov, Artem M.
AU - Saubanère, Matthieu
AU - Foix, Dominique
AU - Berg, Erik J.
AU - Rousse, Gwenaelle
AU - Doublet, Marie Liesse
AU - Gonbeau, Danielle
AU - Novák, Petr
AU - Van Tendeloo, Gustaaf
AU - Dominko, Robert
AU - Tarascon, Jean Marie
PY - 2015/12/18
Y1 - 2015/12/18
N2 - 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.
AB - 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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U2 - 10.1126/science.aac8260
DO - 10.1126/science.aac8260
M3 - Article
C2 - 26680196
AN - SCOPUS:84950336046
SN - 0036-8075
VL - 350
SP - 1516
EP - 1521
JO - Science
JF - Science
IS - 6267
ER -