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Title: Spectroscopic Signature of Oxidized Oxygen States in Peroxides

Journal Article · · Journal of Physical Chemistry Letters

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 Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (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
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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Cited By (11)

Dissociate lattice oxygen redox reactions from capacity and voltage drops of battery electrodes journal February 2020
Eliminating Transition Metal Migration and Anionic Redox to Understand Voltage Hysteresis of Lithium‐Rich Layered Oxides journal January 2020
Ultrahigh power and energy density in partially ordered lithium-ion cathode materials journal March 2020
Manganese oxidation as the origin of the anomalous capacity of Mn-containing Li-excess cathode materials journal July 2019
Stabilizing the Oxygen Lattice and Reversible Oxygen Redox Chemistry through Structural Dimensionality in Lithium-Rich Cathode Oxides journal February 2019
Fundamental insights about interlayer cation migration in Li-ion electrodes at high states of charge journal January 2019
Metal–oxygen decoordination stabilizes anion redox in Li-rich oxides journal February 2019
Stabilizing the Oxygen Lattice and Reversible Oxygen Redox Chemistry through Structural Dimensionality in Lithium‐Rich Cathode Oxides journal February 2019
Review of Recent Development of In Situ/Operando Characterization Techniques for Lithium Battery Research journal May 2019
P2-type Na 2/3 Ni 1/3 Mn 2/3 O 2 Cathode Material with Excellent Rate and Cycling Performance for Sodium-Ion Batteries journal January 2019
Fingerprint Oxygen Redox Reactions in Batteries through High-Efficiency Mapping of Resonant Inelastic X-ray Scattering journal January 2019

Figures / Tables (8)