Effect of current density on the solid electrolyte interphase formation at the lithium∣Li6PS5Cl interface

Sudarshan Narayanan, Ulderico Ulissi, Joshua S. Gibson, Yvonne A. Chart, Robert S. Weatherup and Mauro Pasta ()
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Sudarshan Narayanan: University of Oxford
Ulderico Ulissi: Nissan Technical Centre Europe
Joshua S. Gibson: University of Oxford
Yvonne A. Chart: University of Oxford
Robert S. Weatherup: University of Oxford
Mauro Pasta: University of Oxford

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Understanding the chemical composition and morphological evolution of the solid electrolyte interphase (SEI) formed at the interface between the lithium metal electrode and an inorganic solid-state electrolyte is crucial for developing reliable all-solid-state lithium batteries. To better understand the interaction between these cell components, we carry out X-ray photoemission spectroscopy (XPS) measurements during lithium plating on the surface of a Li6PS5Cl solid-state electrolyte pellet using an electron beam. The analyses of the XPS data highlight the role of Li plating current density on the evolution of a uniform and ionically conductive (i.e., Li3P-rich) SEI capable of decreasing the electrode∣solid electrolyte interfacial resistance. The XPS findings are validated via electrochemical impedance spectrsocopy measurements of all-solid-state lithium-based cells.

Date: 2022
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DOI: 10.1038/s41467-022-34855-9

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