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Article

Influence of Membrane Equivalent Weight and Reinforcement on Ionic Species Crossover in All-Vanadium Redox Flow Batteries

1
Electrochemical Energy Storage and Conversion Laboratory, Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA
2
Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Jerry Meldon
Membranes 2017, 7(2), 29; https://doi.org/10.3390/membranes7020029
Received: 3 May 2017 / Revised: 23 May 2017 / Accepted: 2 June 2017 / Published: 6 June 2017
(This article belongs to the Special Issue Membrane Transport Modeling)
One of the major sources of lost capacity in all-vanadium redox flow batteries (VRFBs) is the undesired transport (usually called crossover) of water and vanadium ions through the ion-exchange membrane. In this work, an experimental assessment of the impact of ion-exchange membrane properties on vanadium ion crossover and capacity decay of VRFBs has been performed. Two types of cationic membranes (non-reinforced and reinforced) with three equivalent weights of 800, 950 and 1100 g·mol−1 were investigated via a series of in situ performance and capacity decay tests along with ex situ vanadium crossover measurement and membrane characterization. For non-reinforced membranes, increasing the equivalent weight (EW) from 950 to 1100 g·mol−1 decreases the V(IV) permeability by ~30%, but increases the area-specific resistance (ASR) by ~16%. This increase in ASR and decrease in V(IV) permeability was accompanied by increased through-plane membrane swelling. Comparing the non-reinforced with reinforced membranes, membrane reinforcement increases ASR, but V(IV) permeability decreases. It was also shown that there exists a monotonic correlation between the discharge capacity decay over long-term cycling and V(IV) permeability values. Thus, V(IV) permeability is considered a representative diagnostic for assessing the overall performance of a particular ion-exchange membrane with respect to capacity fade in a VRFB. View Full-Text
Keywords: vanadium redox flow battery; crossover; equivalent weight; reinforcement; swelling; conductivity; UV-Vis spectroscopy vanadium redox flow battery; crossover; equivalent weight; reinforcement; swelling; conductivity; UV-Vis spectroscopy
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MDPI and ACS Style

Ashraf Gandomi, Y.; Aaron, D.S.; Mench, M.M. Influence of Membrane Equivalent Weight and Reinforcement on Ionic Species Crossover in All-Vanadium Redox Flow Batteries. Membranes 2017, 7, 29. https://doi.org/10.3390/membranes7020029

AMA Style

Ashraf Gandomi Y, Aaron DS, Mench MM. Influence of Membrane Equivalent Weight and Reinforcement on Ionic Species Crossover in All-Vanadium Redox Flow Batteries. Membranes. 2017; 7(2):29. https://doi.org/10.3390/membranes7020029

Chicago/Turabian Style

Ashraf Gandomi, Yasser; Aaron, Doug S.; Mench, Matthew M. 2017. "Influence of Membrane Equivalent Weight and Reinforcement on Ionic Species Crossover in All-Vanadium Redox Flow Batteries" Membranes 7, no. 2: 29. https://doi.org/10.3390/membranes7020029

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