Glass‐Type Polyamorphism in Li‐Garnet Thin Film Solid State Battery Conductors

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 crystal...

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Bibliographic Details
Published in:Advanced energy materials 2018-04, Vol.8 (12), p.n/a
Main Authors: Garbayo, Iñigo, Struzik, Michal, Bowman, William J., Pfenninger, Reto, Stilp, Evelyn, Rupp, Jennifer L. M.
Format: Article
Language:English
Subjects:
amorphous
Conductivity
Conductors
Crystal structure
Crystallinity
Crystallization
Dendritic structure
electrolytes
garnets
Glass
Grain boundaries
Microbatteries
Molten salt electrolytes
polyamorphism
Solid electrolytes
Solid state
solid state batteries
Structural stability
Thin films
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Summary: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. Lithium garnets such as Li7La3Zr2O12 are promising electrolyte materials for solid state batteries due to their high conductivity and structural stability. In this paper, the existence of “polyamorphism” leading to various new glass‐type phases for Li‐garnet thin films besides the known crystalline ceramic ones is demonstrated. A maximum in Li‐conductivity exists depending on the initially frozen thermodynamic state.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201702265