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Issue 2, 2017
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A high-performance all-metallocene-based, non-aqueous redox flow battery

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Here, a class of organometallic compounds, metallocenes, are explored to serve as both catholyte and anolyte redox species for non-aqueous lithium-based redox flow battery (Li-RFB) applications. The prototype of all-metallocene-based Li-RFB exploits ferrocene (FeCp2) and cobaltocene (CoCp2) as the redox-active cathode and anode, respectively. The reaction rate constants of metallocenes are determined to be as high as 10āˆ’3 cm sāˆ’1, two orders greater than most redox-active materials applied in conventional redox flow batteries. This designed Li-RFB yields a working potential of 1.7 V, and by introduction of methyl groups on the ligand rings of CoCp2, the working potential can be further increased to 2.1 V. The fabricated full cell shows capacity retention of over 99% per cycle with a coulombic efficiency (CE) of >95% and an energy efficiency of >85%. These results demonstrate a generic design route towards high performance non-aqueous RFBs via rational screening and functionalization of metallocenes.

Graphical abstract: A high-performance all-metallocene-based, non-aqueous redox flow battery

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The article was received on 16 Jul 2016, accepted on 07 Oct 2016 and first published on 07 Oct 2016

Article type: Communication
DOI: 10.1039/C6EE02057G
Citation: Energy Environ. Sci., 2017,10, 491-497

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    A high-performance all-metallocene-based, non-aqueous redox flow battery

    Y. Ding, Y. Zhao, Y. Li, J. B. Goodenough and G. Yu, Energy Environ. Sci., 2017, 10, 491
    DOI: 10.1039/C6EE02057G

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