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  4. Investigations toward a Non-Aqueous Hybrid Redox-Flow Battery with a Manganese-Based Anolyte and Catholyte
 
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2021
Journal Article
Titel

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

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−1are 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.
Author(s)
Schmucker, M.
Gully, T.A.
Schmidt, A.
Schmidt, B.
Bromberger, K.
Disch, J.
Butschke, B.
Burgenmeister, B.
Sonnenberg, K.
Riedel, S.
Krossing, I.
Zeitschrift
Advanced energy materials
DOI
10.1002/aenm.202101261
File(s)
N-637261.pdf (4.85 MB)
Language
English
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Fraunhofer-Institut für Solare Energiesysteme ISE
Tags
  • Wasserstofftechnologie

  • Wasserstofftechnologie und elektrischer Energiespeicher

  • Elektrolyse und Power-to-Gas

  • Batteriezelltechnologie

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