Epitaxial growth and lithium ion conductivity of lithium-oxide garnet for an all solid-state battery electrolyte

Sangryun Kim, Masaaki Hirayama, Sou Taminato, Ryoji Kanno

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)

Abstract

Epitaxial thin films of Al-doped Li7La3Zr 2O12 (LLZO) with a cubic garnet-type structure were successfully synthesized using pulsed laser deposition to investigate the lithium ion conduction in grains. Two orientations of the films were obtained depending on the Gd3Ga5O12 (GGG) substrate orientation, LLZO(001)/GGG(001) and LLZO(111)/GGG(111). The ionic conductivities in the grains of the (001) and (111) films were 2.5 × 10-6 and 1.0 × 10-5 S cm-1 at 298 K, respectively, which were lower than those of polycrystalline LLZO of over 10-4 S cm -1. X-ray reflectometry and inductively coupled plasma mass spectrometry revealed a large amount of Al3+ of over 0.6 moles substituted for Li+. These results indicate that the Al3+ substitution in the LLZO lattice decreases the number of movable lithium ions and blocks the three-dimensional lithium migration pathway. The lattice mismatch between the film and the substrate induced the lattice distortion of the LLZO, resulting in different conductivities between the (001) and (111) films. The epitaxial-film model system directly clarified a substantial impact of the Al substitution and the lattice distortion on the lithium ion conductivity in the LLZO.

Original languageEnglish
Pages (from-to)13112-13117
Number of pages6
JournalDalton Transactions
Volume42
Issue number36
DOIs
Publication statusPublished - 2013 Sep 28
Externally publishedYes

ASJC Scopus subject areas

  • Inorganic Chemistry

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