Optimizing membrane thickness for vanadium redox flow batteries

Dongyang Chen, Michael Anthony Hickner, Ertan Agar, E. Caglan Kumbur

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Two important intrinsic properties of proton exchange membranes for vanadium redox flow battery (VRFB) operation are proton conductivity and vanadium permeability. These characteristics are thickness-normalized quantities and depend on fundamental material parameters. However, the operational criteria of proton exchange membranes in these devices are the membrane resistance and vanadium crossover flux, both of which depend on membrane thickness. Herein, we explore the influence of the thickness of ion exchange capacity (IEC)-optimized sulfonated fluorinated poly(arylene ether) (SFPAE) membranes on their VRFB performance including charge/discharge behavior, charge depth, coulombic efficiency, voltage efficiency, energy efficiency and cell polarization. IEC-optimized SFPAE membranes with three different thicknesses (28μm, 45μm and 80μm) were prepared and tested in this study. It was found that the combined effects of the ohmic loss and electrolyte crossover loss in the VRFB, which were governed by membrane thickness, resulted in an optimal membrane thickness of 45μm for SFPAE under the conditions tested. Thicker membranes were observed to cause higher cell resistance while thinner membranes yielded larger vanadium crossover flux, both of which had negative impacts on the cell performance. The maximum power densities of the VRFBs assembled with 28μm, 45μm and 80μm SFPAE membranes were 267mWcm-2, 311mWcm-2 and 253mWcm-2 respectively, much higher than that of the VRFB assembled with N212 membrane, which was 204mWcm-2. These results supported our previous observation that SFPAE was superior to N212 with regard to VRFB performance. The data also indicated that there is an optimum membrane thickness for a given set of properties through which the cell performance can be significantly improved while keeping the membrane material constant.

Original languageEnglish (US)
Pages (from-to)108-113
Number of pages6
JournalJournal of Membrane Science
Volume437
DOIs
StatePublished - Jun 5 2013

Fingerprint

Vanadium
vanadium
Oxidation-Reduction
electric batteries
membranes
Membranes
Ether
Ethers
ethers
Ion exchange
Protons
crossovers
Ion Exchange
Flow batteries
cells
protons
Fluxes
Proton conductivity
Electrolytes
Energy efficiency

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

Chen, Dongyang ; Hickner, Michael Anthony ; Agar, Ertan ; Kumbur, E. Caglan. / Optimizing membrane thickness for vanadium redox flow batteries. In: Journal of Membrane Science. 2013 ; Vol. 437. pp. 108-113.
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Optimizing membrane thickness for vanadium redox flow batteries. / Chen, Dongyang; Hickner, Michael Anthony; Agar, Ertan; Kumbur, E. Caglan.

In: Journal of Membrane Science, Vol. 437, 05.06.2013, p. 108-113.

Research output: Contribution to journalArticle

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