Lithium diffusion coefficient in LiMn2O4 thin films measured by secondary ion mass spectrometry with ion-exchange method

Naoaki Kuwata, Masakatsu Nakane, Takamichi Miyazaki, Kazutaka Mitsuishi, Junichi Kawamura

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this study, the lithium tracer diffusion coefficient (DLi ) in spinel-type LiMn2O4 thin films is measured by secondary ion mass spectroscopy (SIMS) in the temperature range from 200 to 550 °C. An ion-exchange method is employed to prepare diffusion couples consisting of the stable isotopes 6Li and 7Li. The isotope profiles were measured by SIMS analysis to determine DLi in the LiMn2O4 films. The DLi value was 1.4 × 10−10 cm2/s at 300 °C and the activation energy was 0.52 eV, which is consistent with that of bulk LiMn2O4. The extrapolated value of DLi at 25 °C was on the order of 10−14 cm2/s, which is smaller than the chemical diffusion coefficient of LixMn2O4 measured by electrochemical methods. The temperature dependence of DLi can be explained by the vacancy diffusion model, in which the extrinsic and intrinsic regions of diffusion exist in the low- and high-temperature regions, respectively.

Original languageEnglish
Pages (from-to)266-271
Number of pages6
JournalSolid State Ionics
Volume320
DOIs
Publication statusPublished - 2018 Jul

Keywords

  • Lithium-ion battery
  • Mixed conductor
  • SIMS
  • Thin film
  • Tracer diffusion coefficient

ASJC Scopus subject areas

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

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