Cargando…
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...
Autores principales: | , , , |
---|---|
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 |
_version_ | 1783362132442611712 |
---|---|
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). |
format | Online Article Text |
id | pubmed-6180111 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT tungsiuon nanoporousaramidnanofibreseparatorsfornonaqueousredoxflowbatteries AT fishersydneyl nanoporousaramidnanofibreseparatorsfornonaqueousredoxflowbatteries AT kotovnicholasa nanoporousaramidnanofibreseparatorsfornonaqueousredoxflowbatteries AT thompsonlevit nanoporousaramidnanofibreseparatorsfornonaqueousredoxflowbatteries |