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Impact of Nano‐sized Inorganic Fillers on PEO‐based Electrolytes for Potassium Batteries

Khudyshkina, Anna D. 1; Rauska, Ulf-Christian 1; Butzelaar, Andreas J. 2; Hoffmann, Maxi 2; Wilhelm, Manfred 2; Theato, Patrick ORCID iD icon 2,3; 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)

Abstract:

The low melting points of solid polymer electrolytes (SPEs) based on the KTFSI electrolyte salt allow comparatively low operation temperatures (below 50 °C) for K-ion batteries, unlike their Li or Na counterparts. Unfortunately, for this reason the electrolyte is also rendered mechanically unsuitable in its function to act as a cell separator. Therefore, in this work the use of inorganic nanofillers (Al2O3 and SiO2) is explored with the aim to improve rheological, thermal and cation transport properties of the resulting polymer composite electrolytes. Their electrochemical properties were further examined in K-metal symmetrical cells and K-metal/SPE/K2Fe[Fe(CN)6] cells and compared to corresponding liquid electrolyte systems. As a result of particle-polymer interactions, filler-containing SPEs showed higher degrees of crystallinity combined with filler polymer interaction and thus improved mechanical integrity in the relevant temperature range of 25–55 °C, while maintaining similar ionic conductivities than a filler-free sample above the melting temperature. Although plating-stripping experiments in symmetrical cell setups suggested high cell resistances for various compositions and in some cases even rapid cell failure, Al2O3-based SPEs generally displayed high capacity retention when cycled against a positive electrode (here Prussian blue analogue K2Fe[Fe(CN)6]) over 100–160 cycles and possibly beyond.

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 2024
Sprache Englisch
Identifikator ISSN: 2566-6223
KITopen-ID: 1000164801
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Weitere HGF-Programme 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Batteries and Supercaps
Verlag John Wiley and Sons
Band 7
Heft 1
Seiten Art.-Nr.: e202300404
Vorab online veröffentlicht am 30.10.2023
Schlagwörter solid polymer electrolyte, SPE, inorganic filler, mechanical integrity, potassium-ion battery, KIB, Prussian blue analogue, PBA
Nachgewiesen in Web of Science
Scopus
Dimensions

Verlagsausgabe §
DOI: 10.5445/IR/1000164801
Veröffentlicht am 28.11.2023
Originalveröffentlichung
DOI: 10.1002/batt.202300404
Scopus
Zitationen: 4
Web of Science
Zitationen: 4
Dimensions
Zitationen: 5
Seitenaufrufe: 106
seit 28.11.2023
Downloads: 67
seit 15.12.2023
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