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Non-Aqueous Redox Flow Battery Material with High Current Density: MEEPT

Odom et al. have recently developed 10-[2-(2-methoxyethoxy)ethyl]-10H-phenothiazine (MEEPT, 1) which features a redox active phenothiazine core and an alkoxy chain to increase solubility in non-aqueous media.
1 acts as a catholyte material for a non-aqueous redox flow battery (RFB), and is miscible with non-aqueous organic solvents to provide electrolyte solutions with high concentration. In addition, 1 shows high current density and long duration cycling for further development of a non-aqueous RFB.1)

Figure 1. Electrochemical and Spectral Properties of MEEPT/MEEPT+

(a) Cyclic voltammogram of MEEPT at 10 mM in 0.1 M TBAPF6 in DCM recorded at scan rates from 10 to 500 mV/s. (b) UV-vis spectra of MEEPT-SbCl6 at 0.15 mM in acetonitrile for up to 24 h after dissolution. (These graphical materials were provided by Prof. Odom.)

Glossary: Redox flow battery
Redox flow batteries (RFB) have long duration cycling by charge/discharge, which may have applications for grid level energy storage. RFB may be useful for large energy storage by increasing battery scale; however, it cannot be compact due to low energy density. Aqueous RFB’s using vanadium ion and water-soluble organic active materials in particular have received much attention.1,2) Alternatively, organic solvents (e.g. acetonitrile, carbonate) can be expected to improve solubility of organic active materials to increase energy density.3)
1) M. Skyllas-Kazacos, L. Cao, M. Kazacos, N. Kausar, A. Mousa, ChemSusChem 2016, 9, 1521. (DOI: 10.1002/cssc.201600102) 2) E. S. Beh, D. De Porcellinis, R. L. Gracia, K. T. Xia, R. G. Gordon, M. J. Aziz, ACS Energy Lett. 2017, 2, 639. (DOI: 10.1021/acsenergylett.7b00019) 3) J. Winsberg, T. Hagemann, T. Janoschka, M. D. Hager, U. S. Schubert, Angew. Chem. Int. Ed. 2017, 56, 686. (DOI: 10.1002/anie.201604925)


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