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Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries

Redox flow batteries are attractive for large-scale energy storage due to a combination of high theoretical efficiencies and decoupled power and energy storage capacities. Efforts to significantly increase energy densities by using nonaqueous electrolytes have been impeded by separators with low sel...

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Autores principales: Tung, Siu on, Fisher, Sydney L., Kotov, Nicholas A., Thompson, Levi T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6180111/
https://www.ncbi.nlm.nih.gov/pubmed/30305636
http://dx.doi.org/10.1038/s41467-018-05752-x
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author Tung, Siu on
Fisher, Sydney L.
Kotov, Nicholas A.
Thompson, Levi T.
author_facet Tung, Siu on
Fisher, Sydney L.
Kotov, Nicholas A.
Thompson, Levi T.
author_sort Tung, Siu on
collection PubMed
description Redox flow batteries are attractive for large-scale energy storage due to a combination of high theoretical efficiencies and decoupled power and energy storage capacities. Efforts to significantly increase energy densities by using nonaqueous electrolytes have been impeded by separators with low selectivities. Here, we report nanoporous separators based on aramid nanofibres, which are assembled using a scalable, low cost, spin-assisted layer-by-layer technique. The multilayer structure yields 5 ± 0.5 nm pores, enabling nanofiltration with high selectivity. Further, surface modifications using polyelectrolytes result in enhanced performance. In vanadium acetylacetonate/acetonitrile-based electrolytes, the coated separator exhibits permeabilities an order of magnitude lower and ionic conductivities five times higher than those of a commercial separator. In addition, the coated separators exhibit exceptional stability, showing minimal degradation after more than 100 h of cycling. The low permeability translates into high coulombic efficiency in flow cell charge/discharge experiments performed at cycle times relevant for large-scale applications (5 h).
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spelling pubmed-61801112018-10-15 Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries Tung, Siu on Fisher, Sydney L. Kotov, Nicholas A. Thompson, Levi T. Nat Commun Article Redox flow batteries are attractive for large-scale energy storage due to a combination of high theoretical efficiencies and decoupled power and energy storage capacities. Efforts to significantly increase energy densities by using nonaqueous electrolytes have been impeded by separators with low selectivities. Here, we report nanoporous separators based on aramid nanofibres, which are assembled using a scalable, low cost, spin-assisted layer-by-layer technique. The multilayer structure yields 5 ± 0.5 nm pores, enabling nanofiltration with high selectivity. Further, surface modifications using polyelectrolytes result in enhanced performance. In vanadium acetylacetonate/acetonitrile-based electrolytes, the coated separator exhibits permeabilities an order of magnitude lower and ionic conductivities five times higher than those of a commercial separator. In addition, the coated separators exhibit exceptional stability, showing minimal degradation after more than 100 h of cycling. The low permeability translates into high coulombic efficiency in flow cell charge/discharge experiments performed at cycle times relevant for large-scale applications (5 h). Nature Publishing Group UK 2018-10-10 /pmc/articles/PMC6180111/ /pubmed/30305636 http://dx.doi.org/10.1038/s41467-018-05752-x Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Tung, Siu on
Fisher, Sydney L.
Kotov, Nicholas A.
Thompson, Levi T.
Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries
title Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries
title_full Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries
title_fullStr Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries
title_full_unstemmed Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries
title_short Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries
title_sort nanoporous aramid nanofibre separators for nonaqueous redox flow batteries
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6180111/
https://www.ncbi.nlm.nih.gov/pubmed/30305636
http://dx.doi.org/10.1038/s41467-018-05752-x
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