Journalartikel

Jahr der Veröffentlichung: 2022

Seiten: 35545-35554

Zeitschrift: ACS Applied Materials & Interfaces

Bandnummer: 14

Heftnummer: 31

ISSN: 1944-8244

eISSN: 1944-8252

Open Access Status: Hybrid

DOI Link: https://doi.org/10.1021/acsami.2c07077

Verlag: American Chemical Society

Abstract: 
In an all-solid-state battery, the electrical contact between its individual components is of key relevance in addition to the electrochemical stability of its interfaces. Impedance spectroscopy is particularly suited for the non-destructive investigation of interfaces and of their stability under load. Establishing a valid correlation between microscopic processes and the macroscopic impedance signal, however, is challenging and prone to errors. Here, we use a 3D electric network model to systematically investigate the effect of various electrode/sample interface morphologies on the impedance spectrum. It is demonstrated that the interface impedance generally results from a charge transfer step and a geometric constriction contribution. The weights of both signals depend strongly on the material parameters as well as on the interface morphology. Dynamic constriction results from a non-ideal local contact, e.g., from pores or voids, which reduce the electrochemical active surface area only in a certain frequency range. Constriction effects dominate the interface behavior for systems with small charge transfer resistance like garnet-type solid electrolytes in contact with a lithium metal electrode. An in-depth analysis of the origin and the characteristics of the constriction phenomenon and their dependence on the interface morphology is conducted. The discussion of the constriction effect provides further insight into the processes at the microscopic level, which are, e.g., relevant in the case of reversible metal anodes.

Harvard-Zitierstil: Eckhardt, J., Klar, P., Janek, J. and Heiliger, C. (2022) Interplay of Dynamic Constriction and Interface Morphology between Reversible Metal Anode and Solid Electrolyte in Solid State Batteries, ACS Applied Materials & Interfaces, 14(31), pp. 35545-35554. https://doi.org/10.1021/acsami.2c07077

APA-Zitierstil: Eckhardt, J., Klar, P., Janek, J., & Heiliger, C. (2022). Interplay of Dynamic Constriction and Interface Morphology between Reversible Metal Anode and Solid Electrolyte in Solid State Batteries. ACS Applied Materials & Interfaces. 14(31), 35545-35554. https://doi.org/10.1021/acsami.2c07077