Kinetic analysis and alloy designs for metal/metal fluorides toward high rate capability for all-solid-state fluoride-ion batteries

Takahiro Yoshinari, Datong Zhang, Kentaro Yamamoto, Yuya Kitaguchi, Aika Ochi, Koji Nakanishi, Hidenori Miki, Shinji Nakanishi, Hideki Iba, Tomoki Uchiyama, Toshiki Watanabe, Toshiyuki Matsunaga, Koji Amezawa, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

Abstract

New concepts for electrochemical energy storage devices are required to handle the physicochemical energy density limit that Li-ion batteries are approaching. All-solid-state fluoride-ion batteries (FIBs), in which monovalent fluoride anions are employed as charge carriers, are regarded as attractive options, and metallic Cu has been proved to be a promising cathode material. However, the rate capability is currently low and kinetic factors associated with the Cu/CuF2reaction are not clearly understood, and the rate-determining step has not yet been identified. Herein, we present the kinetic analyses of a Cu thin-film cathode with a phase-boundary-controlled one-dimensional phase transition processviathe Kolmogorov-Johnson-Mehl-Avrami equation. Concerning the capacity fading caused by the repeated volume expansion/contraction and the consequent interfacial contact loss, a Cu-Au alloy with a reduced lattice mismatch was designed and verified to be efficient to enable fast phase-transition kinetics along with stable cyclabilities, which opens new possibilities in cathode design for all-solid-state FIBs.

Original languageEnglish
Pages (from-to)7018-7024
Number of pages7
JournalJournal of Materials Chemistry A
Volume9
Issue number11
DOIs
Publication statusPublished - 2021 Mar 21

ASJC Scopus subject areas

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

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