Lithium diffusion coefficient in amorphous lithium phosphate thin films measured by secondary ion mass spectroscopy with isotope exchange methods

Naoaki Kuwata, Xiaoli Lu, Takamichi Miyazaki, Yoshiki Iwai, Tadao Tanabe, Junichi Kawamura

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Lithium diffusion coefficients in amorphous lithium phosphate (a-Li3PO4) thin films were determined by secondary ion mass spectroscopy (SIMS), using 7Li and 6Li stable isotopes. The diffusion couples were prepared by an ion-exchange method using liquid electrolyte and a mask method based on thin-film deposition. The tracer diffusion coefficient, DLi , was evaluated by analyzing the isotope profiles obtained by SIMS in the temperature range of 25–160 °C. The diffusion coefficient of a-Li3PO4 was 6.0 × 10− 13 cm2/s at 25 °C, while the activation energy was 0.58 eV, as measured for the samples prepared by using the ion-exchange method. The conductivity diffusion coefficient, Dσ, was calculated from the thin film ionic conductivity, which was determined by impedance spectroscopy. The correlation factor, HR, was 0.55 ± 0.20 in the measured temperature range, which indicated the cooperative motion of lithium ions in lithium phosphate glasses.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalSolid State Ionics
Volume294
DOIs
Publication statusPublished - 2016 Oct 15
Externally publishedYes

Keywords

  • Diffusion coefficient
  • Haven ratio
  • Pulsed laser deposition
  • Thin-film battery

ASJC Scopus subject areas

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

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