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January 6, 2026Energy Advances0 citationsOpen Access

Comparative stability of the solid electrolyte interphase in potassium and sodium batteries

JSJan Felix SchusterUppsala University LALe AnhUppsala University COChristopher A. O’KeefeUniversity of Cambridge

Key Points

This research aims to compare the stability of the solid electrolyte interphase in potassium and sodium batteries.
Investigated SEI stability using model systems
Conducted chemical analysis of the surface and electrolyte
SEI stability is higher in 1 M NaPF6 than in 1 M KPF6
Surface and electrolyte characteristics differ between sodium and potassium systems.

Abstract

The solid electrolyte interphase (SEI) stability is higher in 1 M NaPF 6 compared to 1 M KPF 6 in common carbonate solvents. Battery electrolyte SEI stability was investigated by model systems and chemical analysis of the surface and electrolyte.

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