Thermal Expansion in the Garnet-Type Solid Electrolyte (Li7-xAlx/3)La3Zr2O12 as a Function of Al Content

Evolution of the lattice constant as a function of temperature with the evolution of the (211) peak of cubic (Li6.1Al0.3)La3Zr2O12 during heating (inset).

Scientific Achievement

The study identified the lattice expansion lithium lanthanum zirconium oxide (LLZ), which is an important lithium-metal stable solid-state Li-ion diffusion ceramic membrane as a function of Al-content.

Significance and Impact

The thermal expansion restrictions identify LiCoO2, LiFePO4, and Li4Ti5O12 as the most compatible electrode materials for a thin film solid state battery.

Research Details

  • The expansion was found to fall above the normal range typically seen for garnet type structures.
  • The role of Al substitutions into the structure, an important variable in controlling the ionic conductivity, was also evaluated but found to have only a small effect.
  • The La/O and Zr/O structural components must dominate the rigid three dimensional structure, as there is only a small relationship between Al content and bulk thermal expansion properties.

Work performed at Argonne National Laboratory (JCESR managing partner) by A.A. Hubaud, D.J. Schroeder, B.J. Ingram, J.S. Okasinski, and J.T. Vaughey, J. Alloys Comp. 644, 804-807, 2015.

DOI: 10.1016/j.jallcom.2015.05.067

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