3D indium tin oxide electrodes by ultrasonic spray deposition for current collection applications

E.J. van den Ham, K. Elen, G. Bonneux, G. Maino, P.H.L. Notten, M.K. van Bael, A. Hardy

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

Three dimensionally (3D) structured indium tin oxide (ITO) thin films are synthesized and characterized as a 3D electrode material for current collection applications. Using metal citrate chemistry in combination with ultrasonic spray deposition, a low cost wet-chemical method has been developed to achieve conformal ITO coatings on non-planar scaffolds. Although there is room for improvement with respect to the resistivity (9.9·10 −3 Ω∙cm, 220 nm thick planar films), high quality 3D structured coatings were shown to exhibit conductive properties based on ferrocene reactivity. In view of applications in Li-ion batteries, the electrochemical stability of the current collector was investigated, indicating that stability is guaranteed for voltages of 1.5 V and up (vs. Li +/Li). In addition, subsequent 3D coating of the ITO with WO 3 as a negative electrode (battery) material confirmed the 3D ITO layer functions as a proper current collector. Using this approach, an over 4-fold capacity increase was booked for 3D structured WO 3 in comparison to planar samples, confirming the current collecting capabilities of the 3D ITO coating. Therefore, the 3D ITO presented is considered as a highly interesting material for 3D battery applications and beyond.

Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalJournal of Power Sources
Volume348
DOIs
Publication statusPublished - 30 Apr 2017

Keywords

  • 3D structures
  • Current collector
  • Films
  • ITO
  • TCO
  • Transparent conductive oxide

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