Electrochemical reactions and cathode properties of Fe-doped Li2O for the hermetically sealed lithium peroxide battery

Kosuke Harada, Mitsuhiro Hibino, Hiroaki Kobayashi, Yoshiyuki Ogasawara, Shin Ichi Okuoka, Koji Yonehara, Hironobu Ono, Yasutaka Sumida, Kazuya Yamaguchi, Tetsuichi Kudo, Noritaka Mizuno

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Fe-doped Li2O (FDL) is synthesized mechanochemically and is demonstrated as a new Co-free cathode material for use in sealed Li2O2 batteries, which have been proposed as high energy density batteries. Fe3+ ions are substitutionally doped into the Li sites in an antifluorite-type Li2O structure to create FDL. The FDL consists of (Li0.82Fe0.06)2O (d-FDL) and high-temperature form of Li5FeO4 (o-FDL), in which Fe3+ ions disorderly and orderly arranged, respectively. According to the Mössbauer spectra and quantitative peroxide species analysis, the FDL cathode operates principally based on the redox reaction between O22- and O2-. X-ray diffraction study reveals that the reversible formation of O22- proceeds mainly in the d-FDL. An irreversible side reaction involving the evolution of oxygen gas occurs when the cathode is charged to more than 250 mAh g-1. The FDL (Fe/(Li + Fe) = 10 at%) cathode exhibits a reversible capacity of 200 mAh g-1 over 200 cycles at a current density of 22.5 mA g-1.

Original languageEnglish
Pages (from-to)49-56
Number of pages8
JournalJournal of Power Sources
Volume322
DOIs
Publication statusPublished - 2016 Aug 1
Externally publishedYes

Keywords

  • Cathode material
  • Fe-doped LiO
  • Li-ion battery
  • LiO battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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