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Comparing the Solid Electrolyte Interphases on Graphite Electrodes in K and Li Half Cells

Allgayer, Franziska; Maibach, Julia; Jeschull, Fabian ORCID iD icon


In both Li-ion and K-ion batteries, graphite can be used as the negative electrode material. When potassium ions are stored electrochemically in the graphite host, the electrode capacities fade faster than in the lithium ion counterpart. This could be due to the high reactivity of the potassium metal counter electrode (CE) in half cells or a less stable solid electrolyte interphase (SEI) in the potassium case. Previous surface studies on graphite electrodes cycled in K half cells have focused on the SEI characteristics of different electrolyte formulations or different states of charge. In this study, we exploit the fact that graphite can store both lithium and potassium ions. Cell and component parameters have been largely maintained the same, with the only differences between Li and K half cells being the cation of the electrolyte salt and the alkali metal at the CE. The SEI layers formed under these conditions in either setup are studied using X-ray photoelectron spectroscopy with the aim to draw a direct comparison between the surface layers in both charged and discharged states. The results show a considerable crosstalk under OCV conditions between K-metal and the working electrode. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000141801
Veröffentlicht am 12.01.2022
DOI: 10.1021/acsaem.1c03491
Zitationen: 6
Web of Science
Zitationen: 6
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2574-0962, 2574-0962
KITopen-ID: 1000141801
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in ACS applied energy materials
Verlag American Chemical Society (ACS)
Band 5
Heft 1
Seiten 1136–1148
Vorab online veröffentlicht am 04.01.2022
Schlagwörter XPS, X-ray photoelectron spectroscopy potassium-ion battery, KIB lithium-ion battery, LIB graphite solid electrolyte interphase, SEI
Nachgewiesen in Scopus
Web of Science
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