Glass‐Type Polyamorphism in Li‐Garnet Thin Film Solid State Battery Conductors |
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| Authors: | Iñigo Garbayo Michal Struzik William J Bowman Reto Pfenninger Evelyn Stilp Jennifer L M Rupp |
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| Affiliation: | 1. Electrochemical Materials, Department of Materials, ETH Zürich, Zürich, Switzerland;2. Department of Material Sciences and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA;3. Laboratory for Electrochemical Interfaces, Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA;4. Materials for Energy Conversion, Empa., Dübendorf, Switzerland;5. Electrochemical Materials, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA |
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| Abstract: | Ceramic Li7La3Zr2O12 garnet materials are promising candidates for the electrolytes in solid state batteries due to their high conductivity and structural stability. In this paper, the existence of “polyamorphism” leading to various glass‐type phases for Li‐garnet structure besides the known crystalline ceramic ones is demonstrated. A maximum in Li‐conductivity exists depending on a frozen thermodynamic glass state, as exemplified for thin film processing, for which the local near range order and bonding unit arrangement differ. Through processing temperature change, the crystallization and evolution through various amorphous and biphasic amorphous/crystalline phase states can be followed for constant Li‐total concentration up to fully crystalline nanostructures. These findings reveal that glass‐type thin film Li‐garnet conductors exist for which polyamorphism can be used to tune the Li‐conductivity being potential new solid state electrolyte phases to avoid Li‐dendrite formation (no grain boundaries) for future microbatteries and large‐scale solid state batteries. |
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| Keywords: | amorphous electrolytes garnets polyamorphism solid state batteries thin films |
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