期刊
SCIENTIFIC REPORTS
卷 11, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41598-021-88370-w
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资金
- Strategic partnership TU Graz -TU Darmstadt
- Austrian Federal Ministry for Digital and Economic Affairs
- National Foundation for Research, Technology and Development
- Christian Doppler Research Association (International Christian Doppler Laboratory for Solid-State Batteries)
- Deutsche Forschungsgemeinschaft [398795637]
- European Union [823717-ESTEEM3]
High power solid-state Li batteries face challenges due to dendrite-like structures caused by dislocations. Introducing dislocations to tailor mechanical properties and withstand mechanical stress is a key step. Understanding the mechanics of dislocations in ceramic electrolytes and methods like uniaxial deformation are crucial for this process.
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.
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