Amorphous and perovskite Li3xLa(2/3)−xTiO3 (thin) films via chemical solution deposition: solid electrolytes for all-solid-state Li-ion batteries

E. J. van den Ham (Corresponding author), N. Peys, C. de Dobbelaere, J. D’Haen, F. Mattelaer, C. Detavernier, P. H.L. Notten, A. Hardy, M. K. Van Bael

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9 Citations (Scopus)

Abstract

Thin films of amorphous and crystalline perovskite Li3xLa(2/3)−xTiO3 (LLT) (x = 0.117) are prepared by means of aqueous chemical solution deposition onto rutile TiO2 thin films as an anode, yielding an electrochemical half-cell. The Li-ion conductivity of the pin-hole free, amorphous LLT thin film (90 nm thick) is 3.8 × 10−8 S cm−1 on Pt and 1.3 × 10−8 S cm−1 on rutile TiO2, while measuring perpendicular to the thin film direction with impedance spectroscopy. Grazing angle attenuated total reflectance-Fourier transform infrared spectroscopy shows that all organic precursor molecules have been decomposed at 500 °C. In addition, in situ (heating) X-ray diffraction analysis shows that phase pure crystalline perovskite LLT (x = 0.117) is formed on top of the rutile TiO2 anode at 700 °C. Furthermore, thickness control is possible by varying the precursor solution concentration and the number of deposition cycles. The current study presents a promising synthesis route to develop all-solid-state battery devices based on multi-metal oxide materials using aqueous precursor chemistry.

Original languageEnglish
Pages (from-to)536-543
Number of pages8
JournalJournal of Sol-Gel Science and Technology
Volume73
Issue number3
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Aqueous CSD
  • Half-cell
  • Li-ion conductivity
  • Solid-electrolyte
  • Thin films

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