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The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries
One of the most promising means to increase the energy density of state-of-the-art lithium Li-ion batteries is to replace the graphite anode with a Li metal anode. While the direct use of Li metal may be highly advantageous, at present its practical application is limited by issues related to dendri...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5050435/ https://www.ncbi.nlm.nih.gov/pubmed/27703188 http://dx.doi.org/10.1038/srep34267 |
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author | Mehdi, B. Layla Stevens, Andrew Qian, Jiangfeng Park, Chiwoo Xu, Wu Henderson, Wesley A. Zhang, Ji-Guang Mueller, Karl T. Browning, Nigel D. |
author_facet | Mehdi, B. Layla Stevens, Andrew Qian, Jiangfeng Park, Chiwoo Xu, Wu Henderson, Wesley A. Zhang, Ji-Guang Mueller, Karl T. Browning, Nigel D. |
author_sort | Mehdi, B. Layla |
collection | PubMed |
description | One of the most promising means to increase the energy density of state-of-the-art lithium Li-ion batteries is to replace the graphite anode with a Li metal anode. While the direct use of Li metal may be highly advantageous, at present its practical application is limited by issues related to dendrite growth and low Coulombic efficiency, CE. Here operando electrochemical scanning transmission electron microscopy (STEM) is used to directly image the deposition/stripping of Li at the anode-electrolyte interface in a Li-based battery. A non-aqueous electrolyte containing small amounts of H(2)O as an additive results in remarkably different deposition/stripping properties as compared to the “dry” electrolyte when operated under identical electrochemical conditions. The electrolyte with the additive deposits more Li during the first cycle, with the grain sizes of the Li deposits being significantly larger and more variable. The stripping of the Li upon discharge is also more complete, i.e., there is a higher cycling CE. This suggests that larger grain sizes are indicative of better performance by leading to more uniform Li deposition and an overall decrease in the formation of Li dendrites and side reactions with electrolyte components, thus potentially paving the way for the direct use of Li metal in battery technologies. |
format | Online Article Text |
id | pubmed-5050435 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-50504352016-10-11 The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries Mehdi, B. Layla Stevens, Andrew Qian, Jiangfeng Park, Chiwoo Xu, Wu Henderson, Wesley A. Zhang, Ji-Guang Mueller, Karl T. Browning, Nigel D. Sci Rep Article One of the most promising means to increase the energy density of state-of-the-art lithium Li-ion batteries is to replace the graphite anode with a Li metal anode. While the direct use of Li metal may be highly advantageous, at present its practical application is limited by issues related to dendrite growth and low Coulombic efficiency, CE. Here operando electrochemical scanning transmission electron microscopy (STEM) is used to directly image the deposition/stripping of Li at the anode-electrolyte interface in a Li-based battery. A non-aqueous electrolyte containing small amounts of H(2)O as an additive results in remarkably different deposition/stripping properties as compared to the “dry” electrolyte when operated under identical electrochemical conditions. The electrolyte with the additive deposits more Li during the first cycle, with the grain sizes of the Li deposits being significantly larger and more variable. The stripping of the Li upon discharge is also more complete, i.e., there is a higher cycling CE. This suggests that larger grain sizes are indicative of better performance by leading to more uniform Li deposition and an overall decrease in the formation of Li dendrites and side reactions with electrolyte components, thus potentially paving the way for the direct use of Li metal in battery technologies. Nature Publishing Group 2016-10-05 /pmc/articles/PMC5050435/ /pubmed/27703188 http://dx.doi.org/10.1038/srep34267 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Mehdi, B. Layla Stevens, Andrew Qian, Jiangfeng Park, Chiwoo Xu, Wu Henderson, Wesley A. Zhang, Ji-Guang Mueller, Karl T. Browning, Nigel D. The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries |
title | The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries |
title_full | The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries |
title_fullStr | The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries |
title_full_unstemmed | The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries |
title_short | The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries |
title_sort | impact of li grain size on coulombic efficiency in li batteries |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5050435/ https://www.ncbi.nlm.nih.gov/pubmed/27703188 http://dx.doi.org/10.1038/srep34267 |
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