An Investigation of the Ionic Conductivity and Species Crossover of Lithiated Nafion 117 in Nonaqueous Electrolytes
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Brushett_an investigation.pdf
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601.66 KB
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Author(s)
Darling, Robert M.
Gallagher, Kevin G.
Xie, Wei
Thelen, Jacob L.
Cheng, Kevin J.
Balsara, Nitash P.
Moore, Jeffrey S.
Su, Liang
Badel, Andres F.
Barton, John Leonard
Date Issued
December 2015
Journal
Journal of The Electrochemical Society
Publisher
Electrochemical Society
Citation
Su, Liang et al. “An Investigation of the Ionic Conductivity and Species Crossover of Lithiated Nafion 117 in Nonaqueous Electrolytes.” Journal of The Electrochemical Society 163.1 (2016): A5253–A5262.
Version
Final published version
Abstract
Nonaqueous redox flow batteries are a fast-growing area of research and development motivated by the need to develop low-cost energy storage systems. The identification of a highly conductive, yet selective membrane, is of paramount importance to enabling such a technology. Herein, we report the swelling behavior, ionic conductivity, and species crossover of lithiated Nafion 117 membranes immersed in three nonaqueous electrolytes (PC, PC : EC, and DMSO). Our results show that solvent volume fraction within the membrane has the greatest effect on both conductivity and crossover. An approximate linear relationship between diffusive crossover of neutral redox species (ferrocene) and the ionic conductivity of membrane was observed. As a secondary effect, the charge on redox species modifies crossover rates in accordance with Donnan exclusion. The selectivity of membrane is derived mathematically and compared to experimental results reported here. The relatively low selectivity for lithiated Nafion 117 in nonaqueous conditions suggests that new membranes are required for competitive nonaqueous redox flow batteries to be realized. Potential design rules are suggested for the future membrane engineering work.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1149/2.03211601jes
