Lithium ion conductivity of oriented Li0.33La0.56TiO3 solid electrolyte films prepared by a sol-gel process

Takashi Teranishi, Yuki Ishii, Hidetaka Hayashi, Akira Kishimoto

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Lithium lanthanum titanates (Li3xLa2/3 - xTiO3, LLTOs) having a-axis orientations were synthesized via a simple sol-gel route on SrTiO3 and Nb-doped SrTiO3 substrates. The lithium ion conduction behaviors of the LLTO films were determined. Annealing the films above 1200 °C yielded strong a-axis growth orientation, while heating samples above 1300 °C led to the reduction of the Li transference number, TLi, which was attributed to Li evaporation. The optimized annealing temperature was 1200 °C, where both the bulk conductivity, σdc, and the TLi exhibited their maxima. The bulk conductivity was 4.42 × 10- 5 S/cm for a 411-nm-thick film, which was almost 10-times-higher than that previously reported for sol-gel-derived films. A key reason for the enhancement in conductivity is the expanded bottleneck of the LLTO lattice because of a tensile stress induced by the substrate. Optimization of the annealing temperature and the film thickness further improved the conductivity.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalSolid State Ionics
Volume284
DOIs
Publication statusPublished - Jan 1 2016

Keywords

  • LiLaTiO
  • Lithium ion
  • Sol-gel

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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