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Issue 5, 2016
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A low-dissipation, pumpless, gravity-induced flow battery

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Redox flow batteries have the potential to provide low-cost energy storage to enable renewable energy technologies such as wind and solar to overcome their inherent intermittency and to improve the efficiency of electric grids. Conventional flow batteries are complex electromechanical systems designed to simultaneously control flow of redox active fluids and perform electrochemical functions. With the advent of redox active fluids with high capacity density, i.e., Faradaic capacity significantly exceeding the 1–2 M concentration equivalents typical of aqueous redox flow batteries, new flow battery designs become of interest. Here, we design and demonstrate a proof-of-concept prototype for a “gravity-induced flow cell” (GIFcell), representing one of a family of approaches to simpler, more robust, passively driven, lower-cost flow battery architectures. Such designs are particularly appropriate for semi-solid electrodes comprising suspensions of networked conductors and/or electroactive particles, due to their low energy dissipation during flow. Accordingly, we demonstrate the GIFcell using nonaqueous lithium polysulfide solutions containing a nanoscale carbon network in a half-flow-cell configuration and achieve round trip energy efficiency as high as 91%.

Graphical abstract: A low-dissipation, pumpless, gravity-induced flow battery

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The article was received on 23 Mar 2016, accepted on 05 Apr 2016 and first published on 11 Apr 2016

Article type: Paper
DOI: 10.1039/C6EE00874G
Energy Environ. Sci., 2016,9, 1760-1770

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    A low-dissipation, pumpless, gravity-induced flow battery

    X. Chen, B. J. Hopkins, A. Helal, F. Y. Fan, K. C. Smith, Z. Li, A. H. Slocum, G. H. McKinley, W. C. Carter and Y. Chiang, Energy Environ. Sci., 2016, 9, 1760
    DOI: 10.1039/C6EE00874G

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