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Determining phase transitions of layered oxides via electrochemical and crystallographic analysis
The chemical diffusion coefficient in LiNi(1/3)Mn(1/3)Co(1/3)O(2) was determined via the galvanostatic intermittent titration technique in the voltage range 3 to 4.2 V. Calculated diffusion coefficients in these layered oxide cathodes during charging and discharging reach a minimum at the open-circu...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Taylor & Francis
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7534273/ https://www.ncbi.nlm.nih.gov/pubmed/33061838 http://dx.doi.org/10.1080/14686996.2020.1814116 |
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author | Fröhlich, Katja Abrahams, Isaac Jahn, Marcus |
author_facet | Fröhlich, Katja Abrahams, Isaac Jahn, Marcus |
author_sort | Fröhlich, Katja |
collection | PubMed |
description | The chemical diffusion coefficient in LiNi(1/3)Mn(1/3)Co(1/3)O(2) was determined via the galvanostatic intermittent titration technique in the voltage range 3 to 4.2 V. Calculated diffusion coefficients in these layered oxide cathodes during charging and discharging reach a minimum at the open-circuit voltage of 3.8 V and 3.7 V vs. Li/Li(+), respectively. The observed minima of the chemical diffusion coefficients indicate a phase transition in this voltage range. The unit cell parameters of LiNi(1/3)Mn(1/3)Co(1/3)O(2) cathodes were determined at different lithiation states using ex situ crystallographic analysis. It was shown that the unit cell parameter variation correlates well with the observed values for chemical diffusion in NMC cathodes; with a notable change in absolute values in the same voltage range. We relate the observed variation in unit cell parameters to the nickel conversion into the trivalent state, which is Jahn-Teller active, and to the re-arrangement of lithium ions and vacancies. |
format | Online Article Text |
id | pubmed-7534273 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Taylor & Francis |
record_format | MEDLINE/PubMed |
spelling | pubmed-75342732020-10-14 Determining phase transitions of layered oxides via electrochemical and crystallographic analysis Fröhlich, Katja Abrahams, Isaac Jahn, Marcus Sci Technol Adv Mater Energy Materials The chemical diffusion coefficient in LiNi(1/3)Mn(1/3)Co(1/3)O(2) was determined via the galvanostatic intermittent titration technique in the voltage range 3 to 4.2 V. Calculated diffusion coefficients in these layered oxide cathodes during charging and discharging reach a minimum at the open-circuit voltage of 3.8 V and 3.7 V vs. Li/Li(+), respectively. The observed minima of the chemical diffusion coefficients indicate a phase transition in this voltage range. The unit cell parameters of LiNi(1/3)Mn(1/3)Co(1/3)O(2) cathodes were determined at different lithiation states using ex situ crystallographic analysis. It was shown that the unit cell parameter variation correlates well with the observed values for chemical diffusion in NMC cathodes; with a notable change in absolute values in the same voltage range. We relate the observed variation in unit cell parameters to the nickel conversion into the trivalent state, which is Jahn-Teller active, and to the re-arrangement of lithium ions and vacancies. Taylor & Francis 2020-09-15 /pmc/articles/PMC7534273/ /pubmed/33061838 http://dx.doi.org/10.1080/14686996.2020.1814116 Text en © 2020 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Energy Materials Fröhlich, Katja Abrahams, Isaac Jahn, Marcus Determining phase transitions of layered oxides via electrochemical and crystallographic analysis |
title | Determining phase transitions of layered oxides via electrochemical and crystallographic analysis |
title_full | Determining phase transitions of layered oxides via electrochemical and crystallographic analysis |
title_fullStr | Determining phase transitions of layered oxides via electrochemical and crystallographic analysis |
title_full_unstemmed | Determining phase transitions of layered oxides via electrochemical and crystallographic analysis |
title_short | Determining phase transitions of layered oxides via electrochemical and crystallographic analysis |
title_sort | determining phase transitions of layered oxides via electrochemical and crystallographic analysis |
topic | Energy Materials |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7534273/ https://www.ncbi.nlm.nih.gov/pubmed/33061838 http://dx.doi.org/10.1080/14686996.2020.1814116 |
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