Resistance to fracture in the glassy solid electrolyte Lipon

We report on the mechanical behavior of a solid Li-ion conductor, lithium phosphorous oxynitride (Lipon), for solid-state batteries. In particular, the purpose of this investigation was to quantify the resistance to cracking (fracture toughness) of this material by nanoindentation. We observed surpr...

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Veröffentlicht in:Journal of materials research 2021-03, Vol.36 (4), p.787-796
Hauptverfasser: Kalnaus, Sergiy, Westover, Andrew S., Kornbluth, Mordechai, Herbert, Erik, Dudney, Nancy J.
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Sprache:eng
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Zusammenfassung:We report on the mechanical behavior of a solid Li-ion conductor, lithium phosphorous oxynitride (Lipon), for solid-state batteries. In particular, the purpose of this investigation was to quantify the resistance to cracking (fracture toughness) of this material by nanoindentation. We observed surprising ductility and the ability to recover in Lipon. We were unsuccessful in inducing cracks in Lipon and observed accommodation of stress via pile-up and densification rather than by cracking at various strain rates. Simulations demonstrate that both deformation and densification depend on the alkali content. Densification appears to be recoverable at room temperature. We discuss the findings in comparison with nanoindentation-induced cracking in other inorganic solid electrolyte materials and provide possible explanations for high resistance of Lipon to Li filament propagation. Graphic abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-020-00098-x