A higher redox potential of solid state oxygen redox in Li4SiO4–LiCoO2 nano composite cathode

Daisuke Okuda, Hiroaki Kobayashi, Masashi Ishikawa

Research output: Contribution to journalArticlepeer-review

Abstract

Modern and futuristic products, such as electric and hybrid electric vehicles, require high-capacity batteries. Solid state oxygen redox-type active materials are candidate as high-capacity positive electrode materials for Li-ion batteries. A promising high-capacity cathode material for Li-ion batteries is Li4SiO4 that can have higher redox potential compared with other Li2O-based materials. In this study, anion redox of Li4SiO4 was activated by nano-compositing with LiCoO2 via mechanical alloying. The nano composite cathode exhibits a specific capacity of ∼220 mAh g−1 with ∼0.5 V higher redox potential than that of Li2O-based cathode materials. X-ray absorption/photoelectron spectroscopy analyses show that the redox reaction of oxygen, including the formation and decomposition of superoxide and peroxide, is responsible for the charge compensation in the nano-composite cathode.

Original languageEnglish
Pages (from-to)35733-35739
Number of pages7
JournalCeramics International
Volume48
Issue number23
DOIs
Publication statusPublished - 2022 Dec 1

Keywords

  • Cathode
  • Hard X-ray photoelectron spectroscopy
  • Lithium-ion battery
  • Oxygen redox
  • X-ray absorption spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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