Elastic Properties of the Solid Electrolyte Li7La3Zr2O12 (LLZO)

Yu, Seungho; Schmidt, Robert D.; Garcia-mendez, Regina; Herbert, Erik G.; Dudney, Nancy J.; Wolfenstine, Jeff; Sakamoto, Jeff; Seigel, Donald

doi:10.1021/acs.chemmater.5b03854

Title: Elastic Properties of the Solid Electrolyte Li7La3Zr2O12 (LLZO)

Journal Article · Wed Dec 16 00:00:00 EST 2015 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.5b03854· OSTI ID:1261353

Yu, Seungho ^[1]; Schmidt, Robert D. ^[2]; Garcia-mendez, Regina ^[1]; Herbert, Erik G. ^[3]; Dudney, Nancy J. ^[2]; Wolfenstine, Jeff ^[4]; Sakamoto, Jeff ^[1]; Seigel, Donald ^[1]

Univ. of Michigan, Ann Arbor, MI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan Technological Univ., Houghton, MI (United States)
Army Research Lab., Adelphi, MD (United States)

The oxide known as LLZO, with nominal composition Li₇La₃Zr₂O₁₂, is a promising solid electrolyte for Li-based batteries due to its high Li-ion conductivity and chemical stability with respect to lithium. Solid electrolytes may also enable the use of metallic Li anodes by serving as a physical barrier that suppresses dendrite initiation and propagation during cycling. Prior linear elasticity models of the Li electrode/solid electrolyte interface suggest that the stability of this interface is highly dependent on the elastic properties of the solid separator. For example, dendritic suppression is predicted to be enhanced as the electrolyte s shear modulus increases. In the present study a combination of first-principles calculations, acoustic impulse excitation measurements, and nanoindentation experiments are used to determine the elastic constants and moduli for highconductivity LLZO compositions based on Al and Ta doping. The calculated and measured isotropic shear moduli are in good agreement and fall within the range of 56-61 GPa. These values are an order of magnitude larger than that for Li metal and far exceed the minimum value ( 8.5 GPa) believed to be necessary to suppress dendrite initiation. These data suggest that LLZO exhibits sufficient stiffness to warrant additional development as a solid electrolyte for Li batteries.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1261353

Journal Information:: Chemistry of Materials, Vol. 28, Issue 1; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 373 works

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Free-standing transition metal oxide electrode architectures for electrochemical energy storage Spencer, Michael A.; Augustyn, Veronica Journal of Materials Science, Vol. 54, Issue 20 https://doi.org/10.1007/s10853-019-03823-y	journal	July 2019
Design Strategies to Enable the Efficient Use of Sodium Metal Anodes in High‐Energy Batteries Sun, Bing; Xiong, Pan; Maitra, Urmimala Advanced Materials https://doi.org/10.1002/adma.201903891	journal	October 2019

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