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Tortuosity Effects in Garnet-Type Li7La3Zr2O12 Solid Electrolytes

Journal Article · · ACS Applied Materials and Interfaces
Intrinsic material microstructure features, such as pores or void spaces, grains, and defects can affect local lithium-ion concentration profiles and transport properties in solid ion conductors. The formation of lithium-deficient or -excess regions can accelerate degradation phenomena, such as dendrite formation, lithium plating, and electrode/electrolyte delamination. This paper evaluates the effects pores or void spaces have on the tortuosity of a garnet-type Li7La3Zr2O12 solid electrolyte. Synchrotron X-ray tomography is used to obtain three-dimensional reconstructions of different electrolytes sintered at temperatures between 1050 and 1150 °C. The magnitude of the electrolyte tortuosity and the tortuosity directional anisotropy is shown to increase with sintering temperature. Electrolytes with highly anisometric tortuosity have lower critical current densities. Here, the alignment or elimination of pores within an electrolyte or composite cathode may provide a means or achieving higher critical current densities and higher power densities in all solid-state batteries.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1495002
Alternate ID(s):
OSTI ID: 1494764
Report Number(s):
BNL--211263-2019-JAAM
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 2 Vol. 11; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Lithium migration pathways at the composite interface of LiBH 4 and two-dimensional MoS 2 enabling superior ionic conductivity at room temperature journal January 2020
Visualizing percolation and ion transport in hybrid solid electrolytes for Li–metal batteries journal January 2019
Oriented porous LLZO 3D structures obtained by freeze casting for battery applications journal January 2019
Composite Electrode Ink Formulation for All Solid-State Batteries journal January 2019

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