Electron transport mechanism of tungsten trioxide powder thin film studied by investigating effect of annealing on resistivity

Wei Li*, Akito Sasaki, Hideyuki Oozu, Katsuaki Aoki, Kuniyuki Kakushima, Yoshinori Kataoka, Akira Nishiyama, Nobuyuki Sugii, Hitoshi Wakabayashi, Kazuo Tsutsui, Kenji Natori, Hiroshi Iwai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We report a new approach for improving the recharging and discharging speed of lithium ion batteries based on understanding of the electron conduction mechanism of tungsten trioxide (WO3) powder thin films fabricated from nanoparticles and used in lithium ion battery electrodes. Resistivity measurements are carried out after annealing in N2 or 5% O2 + 95% N2 ambient. Annealing in N2 ambient decreases the resistivity owing to the increased number of oxygen vacancies in the WO3 thin film. Fitting results obtained from the resistivity are used to propose the simultaneous existence of two types of electron conduction mechanism, band conduction and nearest-neighbor hopping (NNH) conduction, contributing to electron conduction in WO3 thin films.

Original languageEnglish
Pages (from-to)407-410
Number of pages4
JournalMicroelectronics Reliability
Volume55
Issue number2
DOIs
StatePublished - 1 Feb 2015

Keywords

  • Activation energy
  • Electron transport mechanism
  • Monoclinic tungsten trioxide powder thin film
  • Resistivity

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