Improvement of the charge/discharge rate by introducing oxygen vacancies in WO3 negative electrodes for LIBs

Akito Sasaki*, Atsuya Sasaki, Yoshinori Kataoka, Syuichi Saito, Kumpei Kobayashi, Kuniyuki Kakushima, Kazuo Tsutsui, Hiroshi Iwai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We have previously reported that the oxygen vacancies of tungsten oxide (WO3) play an important role in determining the charge/discharge rate of lithium ion secondary batteries (LIBs). We have fabricated electrodes by spray-coating WO3 particles onto a Ti foil, then generating oxygen vacancies and inducing necking between the particles by annealing in N2. However, this conventional method is unsuitable for use in mass production because the adhesive strength between the particles and the foil is decreased by the stress generated during heat treatment and because of the high cost of the Ti foils. In this study, with the goal of enabling the mass production of electrodes, we propose a method of synthesizing WO3 particles, in which oxygen vacancies are generated before coating to form electrodes on Al foil. A synthesized mixed layer containing WO3 particles and a conductive auxiliary agent was coated on a carbon-coated Al foil to obtain a negative electrode for LIBs. As a result, an internal resistance of 3.7Ω·cm2 was obtained. Furthermore, evaluation of the discharge rate revealed that the capacity retention rate was 65.7% at 100C (100% at 1C). We succeeded in fabricating the above electrodes with high-speed charge/discharge characteristics.

Original languageEnglish
Pages (from-to)310-314
Number of pages5
JournalElectrochemistry
Volume85
Issue number6
DOIs
StatePublished - 2017

Keywords

  • Lithium ion battery
  • Oxygen vacancy
  • Tungsten oxide

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