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Title: Anionic Oxygen Redox in the High-Lithium Material Li8SnO6

Abstract

Lithiated transition metal oxide cathode materials that combine oxygen-anion redox [O2/(O2)n–] with cation redox offer substantial capacities and higher voltage than cathodes without oxygen redox, but oxygen-anion redox is usually accompanied by the formation of peroxo or superoxo species that may cause oxygen release. To clarify the relationship between the oxygen release and peroxide and superoxide dimers without the complication of transition-metal redox, we performed density functional theory calculations to study the layered Li8SnO6 cathode because it has only oxygen-anion redox during delithiation. Features with O–O distances of ~1.5 Å (corresponding to the formation of a peroxide) were observed at 75% lithium concentration, and further delithiation to 62.5% lithium concentration shortened the O–O bond distance to ~1.3 Å (corresponding to the formation of superoxide). The solely anionic oxygen redox stabilizes the delithiated structure of Li8–xSnO6, and it does not cause structural disorder or release oxygen gas. Ab initio molecular dynamics calculations in the supercell at 300 K indicate that oxygen dimerization may occur at 75% lithium concentration. On the (0001) surface with a high lithium concentration (98%), oxygen dimerization is unfavorable. The calculations by HSE06 show that oxygen redox in Li8SnO6 offers an initial voltage (vs Li/Li+) greater than 4.2more » V. The GGA+U calculations indicate that the Li+-polaron in Li95Sn12O72 migrates with a migration barrier of only 0.43 eV. Here, this work also quantifies a solely anionic oxygen redox mechanism in Li8SnO6, and it provides a deeper understanding of anionic oxygen redox in Li-excess oxide cathode materials.« less

Authors:
 [1]; ORCiD logo [2];  [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [3]
  1. Fuzhou Univ., Fujian (China)
  2. Chinese Academy of Sciences, Fuzhou (China)
  3. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1771012
Grant/Contract Number:  
SC0008688
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 33; Journal Issue: 3; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Oxygen; Redox reactions; Oxides; Energy; Chemical calculations

Citation Formats

Luo, Ningjing, Hou, Zhufeng, Zheng, Cheng, Zhang, Yongfan, Stein, Andreas, Huang, Shuping, and Truhlar, Donald G. Anionic Oxygen Redox in the High-Lithium Material Li8SnO6. United States: N. p., 2021. Web. doi:10.1021/acs.chemmater.0c03259.
Luo, Ningjing, Hou, Zhufeng, Zheng, Cheng, Zhang, Yongfan, Stein, Andreas, Huang, Shuping, & Truhlar, Donald G. Anionic Oxygen Redox in the High-Lithium Material Li8SnO6. United States. https://doi.org/10.1021/acs.chemmater.0c03259
Luo, Ningjing, Hou, Zhufeng, Zheng, Cheng, Zhang, Yongfan, Stein, Andreas, Huang, Shuping, and Truhlar, Donald G. Mon . "Anionic Oxygen Redox in the High-Lithium Material Li8SnO6". United States. https://doi.org/10.1021/acs.chemmater.0c03259. https://www.osti.gov/servlets/purl/1771012.
@article{osti_1771012,
title = {Anionic Oxygen Redox in the High-Lithium Material Li8SnO6},
author = {Luo, Ningjing and Hou, Zhufeng and Zheng, Cheng and Zhang, Yongfan and Stein, Andreas and Huang, Shuping and Truhlar, Donald G.},
abstractNote = {Lithiated transition metal oxide cathode materials that combine oxygen-anion redox [O2–/(O2)n–] with cation redox offer substantial capacities and higher voltage than cathodes without oxygen redox, but oxygen-anion redox is usually accompanied by the formation of peroxo or superoxo species that may cause oxygen release. To clarify the relationship between the oxygen release and peroxide and superoxide dimers without the complication of transition-metal redox, we performed density functional theory calculations to study the layered Li8SnO6 cathode because it has only oxygen-anion redox during delithiation. Features with O–O distances of ~1.5 Å (corresponding to the formation of a peroxide) were observed at 75% lithium concentration, and further delithiation to 62.5% lithium concentration shortened the O–O bond distance to ~1.3 Å (corresponding to the formation of superoxide). The solely anionic oxygen redox stabilizes the delithiated structure of Li8–xSnO6, and it does not cause structural disorder or release oxygen gas. Ab initio molecular dynamics calculations in the supercell at 300 K indicate that oxygen dimerization may occur at 75% lithium concentration. On the (0001) surface with a high lithium concentration (98%), oxygen dimerization is unfavorable. The calculations by HSE06 show that oxygen redox in Li8SnO6 offers an initial voltage (vs Li/Li+) greater than 4.2 V. The GGA+U calculations indicate that the Li+-polaron in Li95Sn12O72 migrates with a migration barrier of only 0.43 eV. Here, this work also quantifies a solely anionic oxygen redox mechanism in Li8SnO6, and it provides a deeper understanding of anionic oxygen redox in Li-excess oxide cathode materials.},
doi = {10.1021/acs.chemmater.0c03259},
journal = {Chemistry of Materials},
number = 3,
volume = 33,
place = {United States},
year = {Mon Jan 25 00:00:00 EST 2021},
month = {Mon Jan 25 00:00:00 EST 2021}
}

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