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Mechanism of Lithium Metal Penetration through Inorganic Solid Electrolytes

Porz, Lukas and Swamy, Tushar and Sheldon, Brain W. and Rettenwander, Daniel and Frömling, Till and Thaman, Henry L. and Berendts, Stefan and Uecker, R. and Carter, W. Craig and Chiang, Yet-Ming (2017):
Mechanism of Lithium Metal Penetration through Inorganic Solid Electrolytes.
In: Advanced Energy Materials, Wiley Verlag GmbH, pp. 1-12, 7, ISSN 16146832, DOI: 10.1002/aenm.201701003, [Online-Edition: http://onlinelibrary.wiley.com/doi/10.1002/aenm.201701003/fu...],
[Article]

Abstract

Li deposition is observed and measured on a solid electrolyte in the vicinity of a metallic current collector. Four types of ion-conducting, inorganic solid electrolytes are tested: Amorphous 70/30 mol% Li2S-P2S5, polycrystalline β-Li3PS4, and polycrystalline and single-crystalline Li6La3ZrTaO12 garnet. The nature of lithium plating depends on the proximity of the current collector to defects such as surface cracks and on the current density. Lithium plating penetrates/infiltrates at defects, but only above a critical current density. Eventually, infiltration results in a short circuit between the current collector and the Li-source (anode). These results do not depend on the electrolytes shear modulus and are thus not consistent with the Monroe–Newman model for “dendrites.” The observations suggest that Li-plating in pre-existing flaws produces crack-tip stresses which drive crack propagation, and an electroch-emomechanical model of plating-induced Li infiltration is proposed. Lithium short-circuits through solid electrolytes occurs through a fundamentally different process than through liquid electrolytes. The onset of Li infiltration depends on solid-state electrolyte surface morphology, in particular the defect size and density.

Item Type: Article
Erschienen: 2017
Creators: Porz, Lukas and Swamy, Tushar and Sheldon, Brain W. and Rettenwander, Daniel and Frömling, Till and Thaman, Henry L. and Berendts, Stefan and Uecker, R. and Carter, W. Craig and Chiang, Yet-Ming
Title: Mechanism of Lithium Metal Penetration through Inorganic Solid Electrolytes
Language: English
Abstract:

Li deposition is observed and measured on a solid electrolyte in the vicinity of a metallic current collector. Four types of ion-conducting, inorganic solid electrolytes are tested: Amorphous 70/30 mol% Li2S-P2S5, polycrystalline β-Li3PS4, and polycrystalline and single-crystalline Li6La3ZrTaO12 garnet. The nature of lithium plating depends on the proximity of the current collector to defects such as surface cracks and on the current density. Lithium plating penetrates/infiltrates at defects, but only above a critical current density. Eventually, infiltration results in a short circuit between the current collector and the Li-source (anode). These results do not depend on the electrolytes shear modulus and are thus not consistent with the Monroe–Newman model for “dendrites.” The observations suggest that Li-plating in pre-existing flaws produces crack-tip stresses which drive crack propagation, and an electroch-emomechanical model of plating-induced Li infiltration is proposed. Lithium short-circuits through solid electrolytes occurs through a fundamentally different process than through liquid electrolytes. The onset of Li infiltration depends on solid-state electrolyte surface morphology, in particular the defect size and density.

Journal or Publication Title: Advanced Energy Materials
Volume: 7
Publisher: Wiley Verlag GmbH
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 01 Dec 2017 15:42
DOI: 10.1002/aenm.201701003
Official URL: http://onlinelibrary.wiley.com/doi/10.1002/aenm.201701003/fu...
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