Cation-Disorder-Assisted Reversible Topotactic Phase Transition between Antifluorite and Rocksalt Toward High-Capacity Lithium-Ion Batteries

Hiroaki Kobayashi, Takashi Tsukasaki, Yoshiyuki Ogasawara, Mitsuhiro Hibino, Tetsuichi Kudo, Noritaka Mizuno, Itaru Honma, Kazuya Yamaguchi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Multielectron reaction electrode materials using partial oxygen redox can be potentially used as cathodes in lithium-ion batteries, as they offer numerous advantages, including high reversible capacity and energy density and low cost. Here, a reversible three-electron reaction is demonstrated utilizing topotactic phase transition between antifluorite and rocksalt in a cation-disordered antifluorite-type cubic Li6CoO4 cathode. This cubic phase is synthesized by a simple mechanochemical treatment of conventionally prepared tetragonal Li6CoO4. It displays a reversible capacity of 487 mAh g-1, a high value because of a reversible three-electron reaction using Co2+/Co3+, Co3+/Co4+, and O2-/O22- redox, occurring without O2 gas evolution. The mechanochemical treatment is assumed to reduce its lattice distortion by cation-disordering and facilitate a reversible topotactic phase transition between antifluorite and rocksalt structures via a dynamic cation pushing mechanism.

Original languageEnglish
Pages (from-to)43605-43613
Number of pages9
JournalACS Applied Materials and Interfaces
Volume12
Issue number39
DOIs
Publication statusPublished - 2020 Sep 30

Keywords

  • antifluorite
  • cation-disorder
  • high-capacity cathode
  • lithium-ion battery
  • solid-state oxygen redox
  • topotactic phase transition

ASJC Scopus subject areas

  • Materials Science(all)

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