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Investigations toward a Non-Aqueous Hybrid Redox-Flow Battery with a Manganese-Based Anolyte and Catholyte

 
: Schmucker, M.; Gully, T.A.; Schmidt, A.; Schmidt, B.; Bromberger, K.; Disch, J.; Butschke, B.; Burgenmeister, B.; Sonnenberg, K.; Riedel, S.; Krossing, I.

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Fulltext urn:nbn:de:0011-n-6372616 (4.8 MByte PDF)
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Created on: 24.8.2021


Advanced energy materials 11 (2021), No.24, Art. 2101261, 21 pp.
ISSN: 1614-6840
ISSN: 1614-6832
English
Journal Article, Electronic Publication
Fraunhofer ISE ()
Wasserstofftechnologie; Wasserstofftechnologie und elektrischer Energiespeicher; Elektrolyse und Power-to-Gas; Batteriezelltechnologie

Abstract
A new all-Manganese flow battery (all-MFB) as a non-aqueous hybrid redox-flow battery is reported. The discharged active material [Cat]2[MnIICl4] (Cat = organic cation) utilized in both half-cells supports a long cycle life. The reversible oxidation of [MnIICl4]2− to [MnIIICl5]2− at the positive electrode and manganese metal deposition from [MnIICl4]2− at the negative electrode give a cell voltage of 2.59 V. Suitable electrolytes are prepared and optimized, followed by a characterization in static battery cells and in a pumped flow-cell. Several electrode materials, solvents, and membranes are tested for their feasibility in the all-MFB. An electrolyte consisting of [EMP]2[MnCl4] and some solvent γ-butyrolactone is cycled 500 times, both in a static as well as a flow-cell, over a period of two months, with coulombic efficiencies up to 83%. With the electrolytes prepared in this work, energy densities up to 74 Wh L−1 are possible, exceeding the VRFB benchmark system, using solely the cheap and abundant element manganese as the active material. Although further optimizations are necessary, this system represents a new and promising setup toward sustainable stationary energy storage.

: http://publica.fraunhofer.de/documents/N-637261.html