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Evidence of the chemical stability of the garnet-type solid electrolyte Li 5 La 3 Ta 2 O 12 towards lithium by a surface science approach

Fingerle, Mathias and Loho, Christoph and Ferber, Thimo and Hahn, Horst and Hausbrand, René (2017):
Evidence of the chemical stability of the garnet-type solid electrolyte Li 5 La 3 Ta 2 O 12 towards lithium by a surface science approach.
In: Journal of Power Sources, Elsevier Science Publishing, pp. 72-79, 366, ISSN 03787753, DOI: 10.1016/j.jpowsour.2017.08.109, [Online-Edition: https://doi.org/10.1016/j.jpowsour.2017.08.109],
[Article]

Abstract

The chemical stability between Li metal and garnet-type solid electrolytes is currently under debate, mainly catalyzed by theoretical studies. Here, we investigate the stability of Li5La3Ta2O12 (LLTaO) towards lithium experimentally. Using a surface science approach, lithium is stepwise evaporated on an LLTaO thin film grown by CO2-laser assisted chemical vapor deposition. By annealing of the LLTaO thin film, the Li2CO3 surface layer can be removed, leaving only small traces of Li2CO3, Li2O2 and Li2O behind. The interface formation of LLTaO towards lithium is then monitored by means of X-ray and ultraviolet photoelectron spectroscopy. Neither reaction products related to decomposition nor structural changes in the matrix of the Ta-based garnet-type solid-electrolyte can be detected, indicating that LLTaO exhibits chemical stability under equilibrium conditions. Furthermore, a model for the energy level alignment at the LLTaO/Li interface is discussed.

Item Type: Article
Erschienen: 2017
Creators: Fingerle, Mathias and Loho, Christoph and Ferber, Thimo and Hahn, Horst and Hausbrand, René
Title: Evidence of the chemical stability of the garnet-type solid electrolyte Li 5 La 3 Ta 2 O 12 towards lithium by a surface science approach
Language: English
Abstract:

The chemical stability between Li metal and garnet-type solid electrolytes is currently under debate, mainly catalyzed by theoretical studies. Here, we investigate the stability of Li5La3Ta2O12 (LLTaO) towards lithium experimentally. Using a surface science approach, lithium is stepwise evaporated on an LLTaO thin film grown by CO2-laser assisted chemical vapor deposition. By annealing of the LLTaO thin film, the Li2CO3 surface layer can be removed, leaving only small traces of Li2CO3, Li2O2 and Li2O behind. The interface formation of LLTaO towards lithium is then monitored by means of X-ray and ultraviolet photoelectron spectroscopy. Neither reaction products related to decomposition nor structural changes in the matrix of the Ta-based garnet-type solid-electrolyte can be detected, indicating that LLTaO exhibits chemical stability under equilibrium conditions. Furthermore, a model for the energy level alignment at the LLTaO/Li interface is discussed.

Journal or Publication Title: Journal of Power Sources
Volume: 366
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Garnet-type solid electrolyte, Photoelectron spectroscopy, CO2-laser assisted chemical vapor deposition, Interface stability, Electrolyte-electrode interface, All-solid-state battery
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 27 Sep 2017 08:11
DOI: 10.1016/j.jpowsour.2017.08.109
Official URL: https://doi.org/10.1016/j.jpowsour.2017.08.109
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