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Dislocations in ceramic electrolytes for solid-state Li batteries

Porz, Lukas ; Knez, Daniel ; Scherer, Michael ; Ganschow, Steffen ; Kothleitner, Gerald ; Rettenwander, Daniel (2023)
Dislocations in ceramic electrolytes for solid-state Li batteries.
In: Scientific Reports, 2021, 11
doi: 10.26083/tuprints-00023190
Article, Secondary publication, Publisher's Version

Abstract

High power solid-state Li batteries (SSLB) are hindered by the formation of dendrite-like structures at high current rates. Hence, new design principles are needed to overcome this limitation. By introducing dislocations, we aim to tailor mechanical properties in order to withstand the mechanical stress leading to Li penetration and resulting in a short circuit by a crack-opening mechanism. Such defect engineering, furthermore, appears to enable whisker-like Li metal electrodes for high-rate Li plating. To reach these goals, the challenge of introducing dislocations into ceramic electrolytes needs to be addressed which requires to establish fundamental understanding of the mechanics of dislocations in the particular ceramics. Here we evaluate uniaxial deformation at elevated temperatures as one possible approach to introduce dislocations. By using hot-pressed pellets and single crystals grown by Czochralski method of Li6.4La3Zr1.4Ta0.6O12 garnets as a model system the plastic deformation by more than 10% is demonstrated. While conclusions on the predominating deformation mechanism remain challenging, analysis of activation energy, activation volume, diffusion creep, and the defect structure potentially point to a deformation mechanism involving dislocations. These parameters allow identification of a process window and are a key step on the road of making dislocations available as a design element for SSLB.

Item Type: Article
Erschienen: 2023
Creators: Porz, Lukas ; Knez, Daniel ; Scherer, Michael ; Ganschow, Steffen ; Kothleitner, Gerald ; Rettenwander, Daniel
Type of entry: Secondary publication
Title: Dislocations in ceramic electrolytes for solid-state Li batteries
Language: English
Date: 2023
Place of Publication: Darmstadt
Year of primary publication: 2021
Publisher: Springer Nature
Journal or Publication Title: Scientific Reports
Volume of the journal: 11
Collation: 8 Seiten
DOI: 10.26083/tuprints-00023190
URL / URN: https://tuprints.ulb.tu-darmstadt.de/23190
Corresponding Links:
Origin: Secondary publication service
Abstract:

High power solid-state Li batteries (SSLB) are hindered by the formation of dendrite-like structures at high current rates. Hence, new design principles are needed to overcome this limitation. By introducing dislocations, we aim to tailor mechanical properties in order to withstand the mechanical stress leading to Li penetration and resulting in a short circuit by a crack-opening mechanism. Such defect engineering, furthermore, appears to enable whisker-like Li metal electrodes for high-rate Li plating. To reach these goals, the challenge of introducing dislocations into ceramic electrolytes needs to be addressed which requires to establish fundamental understanding of the mechanics of dislocations in the particular ceramics. Here we evaluate uniaxial deformation at elevated temperatures as one possible approach to introduce dislocations. By using hot-pressed pellets and single crystals grown by Czochralski method of Li6.4La3Zr1.4Ta0.6O12 garnets as a model system the plastic deformation by more than 10% is demonstrated. While conclusions on the predominating deformation mechanism remain challenging, analysis of activation energy, activation volume, diffusion creep, and the defect structure potentially point to a deformation mechanism involving dislocations. These parameters allow identification of a process window and are a key step on the road of making dislocations available as a design element for SSLB.

Identification Number: 8949 (2021)
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-231903
Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 540 Chemistry
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 > Nonmetallic-Inorganic Materials
Date Deposited: 08 Feb 2023 13:33
Last Modified: 09 Feb 2023 06:42
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