Decoupling Cationic–Anionic Redox Processes in a Model Li-Rich Cathode via Operando X-ray Absorption Spectroscopy
Gaurav Assat
1, 2, 3
,
Antonella Iadecola
2
,
Charles Delacourt
2, 4
,
R. Dedryvère
2, 5
,
Jean-Marie Tarascon
1, 2, 3
5
IPREM - UMR 5254 CNRS, Université de Pau et des Pays de l’Adour, Hélioparc, 2 Avenue Pierre Angot, 64053 Pau Cedex 9, France
|
Publication type: Journal Article
Publication date: 2017-11-16
scimago Q1
wos Q1
SJR: 2.065
CiteScore: 12.0
Impact factor: 7.0
ISSN: 08974756, 15205002
Materials Chemistry
General Chemistry
General Chemical Engineering
Abstract
The demonstration of reversible anionic redox in Li-rich layered oxides has revitalized the search for higher energy battery cathodes. To advance the fundamentals of this promising mechanism, we investigate herein the cationic–anionic redox processes in Li2Ru0.75Sn0.25O3—a model Li-rich layered cathode in which Ru (cationic) and O (anionic) are the only redox-active sites. We reveal its charge compensation mechanism and local structural evolutions by applying operando (and complementary ex situ) X-ray absorption spectroscopy (XAS). Among other local effects, the anionic-oxidation-driven distortion of the oxygen network around Ru atoms is thereby visualized. Oxidation of lattice oxygen is also directly proven via hard X-ray photoelectron spectroscopy (HAXPES). Furthermore, we demonstrate a spectroscopy-driven visualization of electrochemical reaction paths, which enabled us to neatly decouple the individual cationic–anionic dQ/dV contributions during cycling. We hence establish the redox and structural ori...
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Total citations:
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(21%)
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GOST
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Assat G. et al. Decoupling Cationic–Anionic Redox Processes in a Model Li-Rich Cathode via Operando X-ray Absorption Spectroscopy // Chemistry of Materials. 2017. Vol. 29. No. 22. pp. 9714-9724.
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Assat G., Iadecola A., Delacourt C., Dedryvère R., Tarascon J. Decoupling Cationic–Anionic Redox Processes in a Model Li-Rich Cathode via Operando X-ray Absorption Spectroscopy // Chemistry of Materials. 2017. Vol. 29. No. 22. pp. 9714-9724.
Cite this
RIS
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TY - JOUR
DO - 10.1021/acs.chemmater.7b03434
UR - https://doi.org/10.1021/acs.chemmater.7b03434
TI - Decoupling Cationic–Anionic Redox Processes in a Model Li-Rich Cathode via Operando X-ray Absorption Spectroscopy
T2 - Chemistry of Materials
AU - Assat, Gaurav
AU - Iadecola, Antonella
AU - Delacourt, Charles
AU - Dedryvère, R.
AU - Tarascon, Jean-Marie
PY - 2017
DA - 2017/11/16
PB - American Chemical Society (ACS)
SP - 9714-9724
IS - 22
VL - 29
SN - 0897-4756
SN - 1520-5002
ER -
Cite this
BibTex (up to 50 authors)
Copy
@article{2017_Assat,
author = {Gaurav Assat and Antonella Iadecola and Charles Delacourt and R. Dedryvère and Jean-Marie Tarascon},
title = {Decoupling Cationic–Anionic Redox Processes in a Model Li-Rich Cathode via Operando X-ray Absorption Spectroscopy},
journal = {Chemistry of Materials},
year = {2017},
volume = {29},
publisher = {American Chemical Society (ACS)},
month = {nov},
url = {https://doi.org/10.1021/acs.chemmater.7b03434},
number = {22},
pages = {9714--9724},
doi = {10.1021/acs.chemmater.7b03434}
}
Cite this
MLA
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Assat, Gaurav, et al. “Decoupling Cationic–Anionic Redox Processes in a Model Li-Rich Cathode via Operando X-ray Absorption Spectroscopy.” Chemistry of Materials, vol. 29, no. 22, Nov. 2017, pp. 9714-9724. https://doi.org/10.1021/acs.chemmater.7b03434.
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