Tortuosity Effects in Garnet-Type Li 7 La 3 Zr 2 O 12 Solid Electrolytes

Marm B. Dixit, Matthew Regala, Fengyu Shen, Xianghui Xiao, Kelsey B. Hatzell

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

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 Li 7 La 3 Zr 2 O 12 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. Alignment or elimination of pores within an electrolyte or composite cathode may provide a means for achieving higher critical current densities and higher power densities in all solid-state batteries.

Original languageEnglish (US)
Pages (from-to)2022-2030
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number2
DOIs
StatePublished - Jan 16 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • microstructure
  • solid electrolyte
  • tomography
  • tortuosity
  • transport

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