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Title: Access to Ru(IV)–Ru(V) and Ru(V)–Ru(VI) Redox in Layered Li7RuO6 via Intercalation Reactions

Abstract

The push to increase the capacity of oxides to store charge as Li-ion battery cathodes has challenged our knowledge of the boundaries of redox chemistry and its relationship to the atomic structure. Layered phases with Ru are now classical models in the quest for refined theories. Current understanding dictates that the highest formal state that can be reached in them is Ru(V), after which activity centered at the oxide anions is triggered. Yet, this picture is challenged by this investigation of the intercalation chemistry of Li7RuO6. Coupling structural and spectroscopic analysis with computational simulations, we show that Li7RuO6 is capable of highly reversible lithiation to Li8RuO6 through the Ru(V)/Ru(IV) redox couple. Further, Li7RuO6 can also undergo anodic Li deintercalation, showing clear evidence of the reversible formation of Ru(VI) with octahedral coordination, an unusual state that is not accessible in other layered oxides. The results highlight the versatility of the Ru-O bond to undergo distinct redox transitions depending on the specific layered arrangements. They enrich our understanding of redox chemistry in solids while underscoring the need for descriptions of charge compensation that reflect the nuance of covalent interactions.

Authors:
 [1];  [2];  [1]; ORCiD logo [3];  [4]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Illinois, Chicago, IL (United States)
  2. Université Montpellier (France); Centre National de la Recherche Scientifique (CNRS) (France); Réseau sur le Stockage Électrochimique de l’Énergie (RS2E), Amiens (France)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
OSTI Identifier:
1901709
Grant/Contract Number:  
AC02-06CH11357; DMR-1809372
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 34; Journal Issue: 8; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemical structure; Electrodes; Oxidation; Oxides; Redox reactions

Citation Formats

Li, Haifeng, Taudul, Beata, Alexander, Grant C. B., Liu, Jue, Freeland, John W., Doublet, Marie-Liesse, and Cabana, Jordi. Access to Ru(IV)–Ru(V) and Ru(V)–Ru(VI) Redox in Layered Li7RuO6 via Intercalation Reactions. United States: N. p., 2022. Web. doi:10.1021/acs.chemmater.2c00043.
Li, Haifeng, Taudul, Beata, Alexander, Grant C. B., Liu, Jue, Freeland, John W., Doublet, Marie-Liesse, & Cabana, Jordi. Access to Ru(IV)–Ru(V) and Ru(V)–Ru(VI) Redox in Layered Li7RuO6 via Intercalation Reactions. United States. https://doi.org/10.1021/acs.chemmater.2c00043
Li, Haifeng, Taudul, Beata, Alexander, Grant C. B., Liu, Jue, Freeland, John W., Doublet, Marie-Liesse, and Cabana, Jordi. Fri . "Access to Ru(IV)–Ru(V) and Ru(V)–Ru(VI) Redox in Layered Li7RuO6 via Intercalation Reactions". United States. https://doi.org/10.1021/acs.chemmater.2c00043. https://www.osti.gov/servlets/purl/1901709.
@article{osti_1901709,
title = {Access to Ru(IV)–Ru(V) and Ru(V)–Ru(VI) Redox in Layered Li7RuO6 via Intercalation Reactions},
author = {Li, Haifeng and Taudul, Beata and Alexander, Grant C. B. and Liu, Jue and Freeland, John W. and Doublet, Marie-Liesse and Cabana, Jordi},
abstractNote = {The push to increase the capacity of oxides to store charge as Li-ion battery cathodes has challenged our knowledge of the boundaries of redox chemistry and its relationship to the atomic structure. Layered phases with Ru are now classical models in the quest for refined theories. Current understanding dictates that the highest formal state that can be reached in them is Ru(V), after which activity centered at the oxide anions is triggered. Yet, this picture is challenged by this investigation of the intercalation chemistry of Li7RuO6. Coupling structural and spectroscopic analysis with computational simulations, we show that Li7RuO6 is capable of highly reversible lithiation to Li8RuO6 through the Ru(V)/Ru(IV) redox couple. Further, Li7RuO6 can also undergo anodic Li deintercalation, showing clear evidence of the reversible formation of Ru(VI) with octahedral coordination, an unusual state that is not accessible in other layered oxides. The results highlight the versatility of the Ru-O bond to undergo distinct redox transitions depending on the specific layered arrangements. They enrich our understanding of redox chemistry in solids while underscoring the need for descriptions of charge compensation that reflect the nuance of covalent interactions.},
doi = {10.1021/acs.chemmater.2c00043},
journal = {Chemistry of Materials},
number = 8,
volume = 34,
place = {United States},
year = {Fri Apr 15 00:00:00 EDT 2022},
month = {Fri Apr 15 00:00:00 EDT 2022}
}

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