Mechanical behavior of Li-ion-conducting crystalline oxide-based solid electrolytes: a brief review

Li-ion-conducting solid electrolytes are receiving considerable attention for use in advanced batteries. These electrolytes would enable use of a Li metal anode, allowing for batteries with higher energy densities and enhanced safety compared to current Li-ion systems. One important aspect of these...

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Bibliographic Details
Published in:Ionics 2018-05, Vol.24 (5), p.1271-1276
Main Authors: Wolfenstine, Jeff, Allen, Jan L., Sakamoto, Jeff, Siegel, Donald J., Choe, Heeman
Format: Article
Language:English
Subjects:
1st World Conference on Solid Electrolytes for Advanced Applications: Garnets and Competitors
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Crystal structure
Crystallinity
Density functional theory
Dislocation mobility
Elastic properties
Electrochemistry
Electrolytes
Electrolytic cells
Energy Storage
Fracture toughness
Ions
Lithium
Mechanical properties
Modulus of elasticity
Molten salt electrolytes
Optical and Electronic Materials
Original Paper
Rechargeable batteries
Renewable and Green Energy
Solid electrolytes
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Summary:Li-ion-conducting solid electrolytes are receiving considerable attention for use in advanced batteries. These electrolytes would enable use of a Li metal anode, allowing for batteries with higher energy densities and enhanced safety compared to current Li-ion systems. One important aspect of these electrolytes that has been overlooked is their mechanical properties. Mechanical properties will play a large role in the processing, assembly, and operation of battery cells. Hence, this paper reviews the elastic, plastic, and fracture properties of crystalline oxide-based Li-ion solid electrolytes for three different crystal structures: Li 6.19 Al 0.27 La 3 Zr 2 O 12 (garnet) [LLZO], Li 0.33 La 0.57 TiO 3 (perovskite) [LLTO], and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (NaSICON) [LATP]. The experimental Young’s modulus value for (1) LLTO is ~ 200 GPa, (2) LLZO is ~ 150 GPa, and (3) for LATP ~ 115 GPa. The experimental values are in good agreement with density functional theory predictions. The fracture toughness value for all three of LLTO, LLZO, and LATP is approximately 1 MPa m −2 . This low value is expected since, they all exhibit at least some degree of covalent bonding, which limits dislocation mobility leading to brittle behavior.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-017-2314-4