Understanding the reaction mechanism and performances of 3d transition metal cathodes for all-solid-state fluoride ion batteries

Datong Zhang, Kentaro Yamamoto, Aika Ochi, Yanchang Wang, Takahiro Yoshinari, Koji Nakanishi, Hiroyuki Nakano, Hidenori Miki, Shinji Nakanishi, Hideki Iba, Tomoki Uchiyama, Toshiki Watanabe, Koji Amezawa, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Fluoride ion batteries (FIBs) are regarded as promising energy storage devices, and it is important and urgent to develop cathode materials with high energy densities for use in FIBs. However, systematic investigations of 3d transition metal/metal fluorides have been rarely reported thus far because of the restricted reversibility and unfavorable interfacial compatibility of 3d transition metal/metal fluorides with solid-state electrolytes. Herein, 3d transition metals are investigated by utilizing thin-film cells with LaF3 substrates. The highly reversible (de)fluorinations of Cu, Co, and Ni are validated at various temperatures. High capacity utilizations of 79.5%, 100%, and 90.5% are obtained during the initial cycle at 150 °C. By combining results from X-ray absorption spectroscopy (XAS) and electrochemical characterization, the electrochemical behaviors of Cu, Co, and Ni, as well as experimental evidence of the two-phase transition mechanism during the M/MF2 reaction are reported for the first time. This provides new insights required for future cathode designs for use in all-solid-state FIBs.

Original languageEnglish
Pages (from-to)406-412
Number of pages7
JournalJournal of Materials Chemistry A
Volume9
Issue number1
DOIs
Publication statusPublished - 2021 Jan 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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