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Title: Li8MnO6: A Novel Cathode Material with Only Anionic Redox

Abstract

In Li-excess transition-metal-oxide cathode materials, anionic oxygen redox can offer high capacity and high voltages, although peroxo and superoxo species may cause oxygen loss, poor cycling performance, and capacity fading. Previous work showed that undesirable formation of peroxide and superoxide bonds is controlled to some extent by Mn substitution, and the present work uses density functional calculations to examine the reasons for this by studying the anionic redox mechanism Li8MnO6. This material is obtained by substituting Mn for Sn in Li8SnO6 or for Zr in Li8ZrO6, and we also compare to previous work on those materials. The calculations predict that Li8MnO6 is stable at room temperature (with a band gap of 3.19 eV as calculated HSE06 and 1.82 eV as calculated with the less reliable with PBE+U), and they elucidate the chemical and structural effects involved in the inhibition of oxygen release in this cathode. Throughout the whole delithiation process, only O2- ions are oxidized. The directional Mn-O bonds formed from unfilled 3d orbitals effectively inhibit the formation of O-O bonds, and the layered structure is maintained even after removing 3 Li per Li8MnO6 formula unit. The calculated average voltage for removal of 3 Li is 3.69 V by HSE06,more » and the corresponding capacity is 389 mAh/g. The high voltage of oxygen anionic redox and the high capacity result in a high energy density of 1436 Wh/kg. The Li-ion diffusion barrier for the dominant interlayer diffusion path along the c-axis is 0.57 eV by PBE+U. Finally, these results help us to understand the oxygen redox mechanism in a new lithium-rich Li8MnO6 cathode material and contribute to the design of high-energy-density lithium-ion-battery cathode materials with favorable electrochemical properties based on anionic oxygen redox.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Fuzhou Univ. (China)
  2. Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
  3. Fuzhou Univ. (China); Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials (China)
  4. Chinese Academy of Sciences (CAS), Fuzhou (China). Fujian Institute of Research on the Structure of Matter
  5. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
2311169
Grant/Contract Number:  
SC0008688; FG02-17ER16362
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 14; Journal Issue: 26; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; anionic oxygen redox; battery; cathode; energy storage; lithium-ion battery; Li8MnO6

Citation Formats

Luo, Ningjing, Feng, Lianggang, Yin, Huimin, Stein, Andreas, Huang, Shuping, Hou, Zhufeng, and Truhlar, Donald G. Li8MnO6: A Novel Cathode Material with Only Anionic Redox. United States: N. p., 2022. Web. doi:10.1021/acsami.2c06173.
Luo, Ningjing, Feng, Lianggang, Yin, Huimin, Stein, Andreas, Huang, Shuping, Hou, Zhufeng, & Truhlar, Donald G. Li8MnO6: A Novel Cathode Material with Only Anionic Redox. United States. https://doi.org/10.1021/acsami.2c06173
Luo, Ningjing, Feng, Lianggang, Yin, Huimin, Stein, Andreas, Huang, Shuping, Hou, Zhufeng, and Truhlar, Donald G. Thu . "Li8MnO6: A Novel Cathode Material with Only Anionic Redox". United States. https://doi.org/10.1021/acsami.2c06173. https://www.osti.gov/servlets/purl/2311169.
@article{osti_2311169,
title = {Li8MnO6: A Novel Cathode Material with Only Anionic Redox},
author = {Luo, Ningjing and Feng, Lianggang and Yin, Huimin and Stein, Andreas and Huang, Shuping and Hou, Zhufeng and Truhlar, Donald G.},
abstractNote = {In Li-excess transition-metal-oxide cathode materials, anionic oxygen redox can offer high capacity and high voltages, although peroxo and superoxo species may cause oxygen loss, poor cycling performance, and capacity fading. Previous work showed that undesirable formation of peroxide and superoxide bonds is controlled to some extent by Mn substitution, and the present work uses density functional calculations to examine the reasons for this by studying the anionic redox mechanism Li8MnO6. This material is obtained by substituting Mn for Sn in Li8SnO6 or for Zr in Li8ZrO6, and we also compare to previous work on those materials. The calculations predict that Li8MnO6 is stable at room temperature (with a band gap of 3.19 eV as calculated HSE06 and 1.82 eV as calculated with the less reliable with PBE+U), and they elucidate the chemical and structural effects involved in the inhibition of oxygen release in this cathode. Throughout the whole delithiation process, only O2- ions are oxidized. The directional Mn-O bonds formed from unfilled 3d orbitals effectively inhibit the formation of O-O bonds, and the layered structure is maintained even after removing 3 Li per Li8MnO6 formula unit. The calculated average voltage for removal of 3 Li is 3.69 V by HSE06, and the corresponding capacity is 389 mAh/g. The high voltage of oxygen anionic redox and the high capacity result in a high energy density of 1436 Wh/kg. The Li-ion diffusion barrier for the dominant interlayer diffusion path along the c-axis is 0.57 eV by PBE+U. Finally, these results help us to understand the oxygen redox mechanism in a new lithium-rich Li8MnO6 cathode material and contribute to the design of high-energy-density lithium-ion-battery cathode materials with favorable electrochemical properties based on anionic oxygen redox.},
doi = {10.1021/acsami.2c06173},
journal = {ACS Applied Materials and Interfaces},
number = 26,
volume = 14,
place = {United States},
year = {Thu Jun 23 00:00:00 EDT 2022},
month = {Thu Jun 23 00:00:00 EDT 2022}
}

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