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Poly(ethylene oxide)-Based Electrolytes for Solid-State Potassium Metal Batteries with a Prussian Blue Positive Electrode

Khudyshkina, Anna D. 1; Morozova, Polina A.; Butzelaar, Andreas J. 2; Hoffmann, Maxi 2; Wilhelm, Manfred 2; Theato, Patrick ORCID iD icon 2,3; Fedotov, Stanislav S.; Jeschull, Fabian ORCID iD icon 1
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)
3 Institut für Biologische Grenzflächen (IBG), Karlsruher Institut für Technologie (KIT)


Potassium-ion batteries are an emerging post-lithium technology that are considered ecologically and economically benign in terms of raw materials’ abundance and cost. Conventional cell configurations employ flammable liquid electrolytes that impose safety concerns, as well as considerable degrees of irreversible side reactions at the reactive electrode interfaces (especially against potassium metal), resulting in a rapid capacity fade. While being inherently safer, solid polymer electrolytes may present a solution to capacity losses owing to their broad electrochemical stability window. Herein, we present for the first time a stable solid-state potassium battery composed of a potassium metal negative electrode, a Prussian blue analogue K₂Fe[Fe(CN)₆] positive electrode, and a poly(ethylene oxide)-potassium bis(trifluoromethanesulfonyl)imide polymer electrolyte. At an elevated operating temperature of 55 °C, the solid-state battery achieved a superior capacity retention of 90% over 50 cycles in direct comparison to a conventional carbonate-based liquid electrolyte operated at ambient temperature with a capacity retention of only 66% over the same cycle number interval.

Verlagsausgabe §
DOI: 10.5445/IR/1000143732
Veröffentlicht am 15.03.2022
DOI: 10.1021/acsapm.2c00014
Zitationen: 6
Web of Science
Zitationen: 4
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Institut für Biologische Grenzflächen (IBG)
Institut für Technische Chemie und Polymerchemie (ITCP)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2637-6105
KITopen-ID: 1000143732
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Weitere HGF-Programme 43.32.01 (POF IV, LK 01) Molecular Materials Basis for Optics & Photonics
Erschienen in ACS Applied Polymer Materials
Verlag American Chemical Society (ACS)
Band 4
Heft 4
Seiten 2734–2746
Vorab online veröffentlicht am 14.03.2022
Nachgewiesen in Web of Science
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