Performance and cost characteristics of multi-electron transfer, common ion exchange non-aqueous redox flow batteries

JOURNAL OF POWER SOURCES

卷:327

Article

Laramie, Sydney M.^1,2  Milshtein, Jarrod D.^1,3  Breault, Tanya M.^1,2  Brushett, Fikile R.^1,4  Thompson, Levi T.^1,2 

[1] Joint Ctr Energy Storage Res, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Chem Engn, 2300 Hayward St, Ann Arbor, MI 48109 USA

[3] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[4] MIT, Dept Chem Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

关键词: Non-aqueous redox flow battery;    Metal coordination complex;    Multi-electron;    Common ion;    Rocking chair;    Energy storage;   

DOI  :  10.1016/j.jpowsour.2016.07.015

来源: Elsevier

【 摘 要 】

Non-aqueous redox flow batteries (NAqRFBs) have recently received considerable attention as promising high energy density, low cost grid-level energy storage technologies. Despite these attractive features, NAqRFBs are still at an early stage of development and innovative design techniques are necessary to improve performance and decrease costs. In this work, we investigate multi-electron transfer, common ion exchange NAqRFBs. Common ion systems decrease the supporting electrolyte requirement, which subsequently improves active material solubility and decreases electrolyte cost. Voltammetric and electrolytic techniques are used to study the electrochemical performance and chemical compatibility of model redox active materials, iron (II) tris(2,2'-bipyridine) tetrafluoroborate (Fe(bpy)(3)(BF4)(2)) and ferrocenylmethyl dimethyl ethyl ammonium tetrafluoroborate (Fc1N112-BF4). These results help disentangle complex cycling behavior observed in flow cell experiments. Further, a simple techno-economic model demonstrates the cost benefits of employing common ion exchange NAqRFBs, afforded by decreasing the salt and solvent contributions to total chemical cost. This study highlights two new concepts, common ion exchange and multi-electron transfer, for NAqRFBs through a demonstration flow cell employing model active species. In addition, the compatibility analysis developed for asymmetric chemistries can apply to other promising species, including organics, metal coordination complexes (MCCs) and mixed MCC/organic systems, enabling the design of low cost NAqRFBs. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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