Polycarbonate-based polymer electrolytes for potassium batteries
Johansson, Isabell Lee 1; Kolesnikov, Timofey I. 1,2; Khudyshkina, Anna
1; Rauska, Ulf-Christian 1; Brandell, Daniel; Mindemark, Jonas; Hernández, Guiomar; Jeschull, Fabian
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)
1; Rauska, Ulf-Christian 1; Brandell, Daniel; Mindemark, Jonas; Hernández, Guiomar; Jeschull, Fabian
11 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)
Abstract:
Polycarbonate-based solid polymer electrolytes (SPEs) are being intensively studied for use in all-solid-state
batteries as a viable alternative to the commonly used poly(ethylene oxide)-based SPEs. Specifically, poly(tri-
methylene carbonate) (PTMC) and poly(ε-caprolactone–co–trimethylene carbonate) (P(CL-TMC)) as a well-
performing copolymeric derivative represent two materials classes that so far have not been studied in potas-
sium battery applications. Herein, we aim to close this knowledge gap by studying physical material properties of
PTMC and P(CL-TMC) solid electrolytes with potassium bis(trifluoromethanesulfonyl)imide (KTFSI) as conduc-
tive salt and examine their electrochemical stability and characteristics in K-metal/K2Fe[Fe(CN)6] (KFF), as well
as Fe[Fe(CN)6/K2Fe[Fe(CN)6] cell configurations. While operation of polycarbonate-based solid-state potassium
batteries at temperatures as low as 40 ◦C is feasible, comparatively low discharge capacities and capacity
retention were observed in comparison to polyether-based systems. For the P(CL-TMC) material, rapid degra-
dation through depolymerization processes in direct contact with potassium metal represents a major bottleneck.
... mehr
batteries as a viable alternative to the commonly used poly(ethylene oxide)-based SPEs. Specifically, poly(tri-
methylene carbonate) (PTMC) and poly(ε-caprolactone–co–trimethylene carbonate) (P(CL-TMC)) as a well-
performing copolymeric derivative represent two materials classes that so far have not been studied in potas-
sium battery applications. Herein, we aim to close this knowledge gap by studying physical material properties of
PTMC and P(CL-TMC) solid electrolytes with potassium bis(trifluoromethanesulfonyl)imide (KTFSI) as conduc-
tive salt and examine their electrochemical stability and characteristics in K-metal/K2Fe[Fe(CN)6] (KFF), as well
as Fe[Fe(CN)6/K2Fe[Fe(CN)6] cell configurations. While operation of polycarbonate-based solid-state potassium
batteries at temperatures as low as 40 ◦C is feasible, comparatively low discharge capacities and capacity
retention were observed in comparison to polyether-based systems. For the P(CL-TMC) material, rapid degra-
dation through depolymerization processes in direct contact with potassium metal represents a major bottleneck.
... mehr
| Zugehörige Institution(en) am KIT | Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS) Institut für Technische Chemie und Polymerchemie (ITCP) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsmonat/-jahr | 12.2025 |
| Sprache | Englisch |
| Identifikator | ISSN: 0167-2738 KITopen-ID: 1000188014 |
| HGF-Programm | 38.02.02 (POF IV, LK 01) Components and Cells |
| Erschienen in | Solid State Ionics |
| Verlag | Elsevier |
| Band | 432 |
| Seiten | Art.-Nr.: 117069 |
| Vorab online veröffentlicht am | 12.11.2025 |
| Nachgewiesen in | Scopus OpenAlex Dimensions Web of Science |