Spectroscopic Signature of Oxidized Oxygen States in Peroxides
- Peking Univ., Shenzhen (People's Republic of China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Stanford Univ. and SLAC National Accelerator Lab., Menlo Park, CA (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Peking Univ., Shenzhen (People's Republic of China)
Here, recent debates on the oxygen redox behaviors in battery electrodes have triggered a pressing demand for the reliable detection and understanding of nondivalent oxygen states beyond conventional absorption spectroscopy. Here, enabled by high-efficiency mapping of resonant inelastic X-ray scattering (mRIXS) coupled with first-principles calculations, we report distinct mRIXS features of the oxygen states in Li2O, Li2CO3, and especially, Li2O2, which are successfully reproduced and interpreted theoretically. mRIXS signals are dominated by valence-band decays in Li2O and Li2CO3. However, the oxidized oxygen in Li2O2 leads to partially unoccupied O-2p states that yield a specific intraband excitonic feature in mRIXS. Such a feature displays a specific emission energy in mRIXS, which disentangles the oxidized oxygen states from the dominating transition-metal/oxygen hybridization features in absorption spectroscopy, thus providing critical hints for both detecting and understanding the oxygen redox reactions in transition-metal oxide based battery materials.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-76SF00515; 2013N080; KYPT20141016105435850; AC02-05CH11231
- OSTI ID:
- 1490975
- Alternate ID(s):
- OSTI ID: 1563980
- Journal Information:
- Journal of Physical Chemistry Letters, Vol. 9, Issue 21; ISSN 1948-7185
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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