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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
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  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Local structural characterization for electrochemical insertion-extraction of lithium into CoO with X-ray absorption spectroscopy

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Title
Local structural characterization for electrochemical insertion-extraction of lithium into CoO with X-ray absorption spectroscopy
Other Titles
Local structural characterization for electrochemical insertion-extraction of lithium into CoO with X-ray absorption spectroscopy
Author
Choi, Hyun ChulLee, Sang YunKim, SSeung BinKim, Min GyuLee, Min KyuShin, Hyun JoonLee, Jae Sung
Keywords
FINE-STRUCTURE STANDARDS; MULTIPLE-SCATTERING; METAL-OXIDES; PRE-EDGE; LI; SPECTRA; EXAFS; COMPLEXES; IONS; IRON
Issue Date
2002-09
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.106, no.36, pp.9252 - 9260
Abstract
Cobalt oxide is known to exhibit a large capacity as a negative electrode in lithium-ion batteries. Here, Co K-edge X-ray absorption spectroscopy (XAS) was used to investigate variations in the local structure during the first electrochemical cycle of the insertion-extraction of lithium into CoO. The XANES and EXAFS spectra in LiyCoO (y: lithium content) varied markedly with the lithium content. The initial insertion of lithium leads to the reduction of Co2+ in the pristine CoO to the reduced metallic Co-0 state. The systematic variations observed in intensities of the peaks corresponding to the 1s --> 3d and 1s --> 4p transitions indicate that the mole ratio of Co to Co-0 increases gradually with the electrochemical insertion of lithium ions. Insertion of lithium causes the local structure around the Co atoms to become asymmetric. The systematic decrease in the magnitude of the Fourier transform (FT) with increasing amount of inserted lithium is closely related to an increase in static disorder due to the presence of two phases: Co-0 clusters and CoO. The small-sized Co particles evolve gradually with a well-separated distribution in the Li2O matrix. In the successive extraction of lithium, the reduced Co particles return reversibly to the high-temperature cubic phase of CoO
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DOI
10.1021/jp0205968
ISSN
1520-6106
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ECHE_Journal Papers
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