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Title: Through-plane conductivities of membranes for nonaqueous redox flow batteries

Abstract

In this study, nonaqueous redox flow batteries (RFB) leverage nonaqueous solvents to enable higher operating voltages compared to their aqueous counterparts. Most commercial components for flow batteries, however, are designed for aqueous use. One critical component, the ion-selective membrane, provides ionic conductance between electrodes while preventing crossover of electroactive species. Here we evaluate the area-specific conductances and through-plane conductivities of commercially available microporous separators (Celgard 2400, 2500) and anion exchange membranes (Neosepta AFX, Neosepta AHA, Fumasep FAP-450, Fumasep FAP-PK) soaked in acetonitrile, propylene carbonate, or two imidazolium-based ionic liquids. Fumasep membranes combined with acetonitrile-based electrolyte solutions provided the highest conductance values and conductivities by far. When tested in ionic liquids, all anion exchange membranes displayed conductivities greater than those of the Celgard microporous separators, though the separators’ decreased thickness-enabled conductances on par with the most conductive anion exchange membranes. Ionic conductivity is not the only consideration when choosing an anion exchange membrane; testing of FAP-450 and FAP-PK membranes in a nonaqueous RFB demonstrated that the increased mechanical stability of PEEK-supported FAP-PK minimized swelling, in turn decreasing solvent mediated crossover and enabling greater electrochemical yields (40% vs. 4%) and Coulombic efficiencies (94% vs. 90%) compared to the unsupported, higher conductance FAP-450.

Authors:
 [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Electricity (OE)
OSTI Identifier:
1235356
Report Number(s):
SAND-2015-4046J
Journal ID: ISSN 0013-4651; 584015
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 162; Journal Issue: 10; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; ionic liquids; membranes; non-aqueous; redox flow battery

Citation Formats

Anderson, Travis Mark, Small, Leo J., Pratt, III, Harry D., and Hudak, Nicholas S. Through-plane conductivities of membranes for nonaqueous redox flow batteries. United States: N. p., 2015. Web. doi:10.1149/2.0901510jes.
Anderson, Travis Mark, Small, Leo J., Pratt, III, Harry D., & Hudak, Nicholas S. Through-plane conductivities of membranes for nonaqueous redox flow batteries. United States. https://doi.org/10.1149/2.0901510jes
Anderson, Travis Mark, Small, Leo J., Pratt, III, Harry D., and Hudak, Nicholas S. Thu . "Through-plane conductivities of membranes for nonaqueous redox flow batteries". United States. https://doi.org/10.1149/2.0901510jes. https://www.osti.gov/servlets/purl/1235356.
@article{osti_1235356,
title = {Through-plane conductivities of membranes for nonaqueous redox flow batteries},
author = {Anderson, Travis Mark and Small, Leo J. and Pratt, III, Harry D. and Hudak, Nicholas S.},
abstractNote = {In this study, nonaqueous redox flow batteries (RFB) leverage nonaqueous solvents to enable higher operating voltages compared to their aqueous counterparts. Most commercial components for flow batteries, however, are designed for aqueous use. One critical component, the ion-selective membrane, provides ionic conductance between electrodes while preventing crossover of electroactive species. Here we evaluate the area-specific conductances and through-plane conductivities of commercially available microporous separators (Celgard 2400, 2500) and anion exchange membranes (Neosepta AFX, Neosepta AHA, Fumasep FAP-450, Fumasep FAP-PK) soaked in acetonitrile, propylene carbonate, or two imidazolium-based ionic liquids. Fumasep membranes combined with acetonitrile-based electrolyte solutions provided the highest conductance values and conductivities by far. When tested in ionic liquids, all anion exchange membranes displayed conductivities greater than those of the Celgard microporous separators, though the separators’ decreased thickness-enabled conductances on par with the most conductive anion exchange membranes. Ionic conductivity is not the only consideration when choosing an anion exchange membrane; testing of FAP-450 and FAP-PK membranes in a nonaqueous RFB demonstrated that the increased mechanical stability of PEEK-supported FAP-PK minimized swelling, in turn decreasing solvent mediated crossover and enabling greater electrochemical yields (40% vs. 4%) and Coulombic efficiencies (94% vs. 90%) compared to the unsupported, higher conductance FAP-450.},
doi = {10.1149/2.0901510jes},
journal = {Journal of the Electrochemical Society},
number = 10,
volume = 162,
place = {United States},
year = {Thu Aug 13 00:00:00 EDT 2015},
month = {Thu Aug 13 00:00:00 EDT 2015}
}

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