Suppressive effect of Fe cations in Mg(Mn1−xFex)2O4 positive electrodes on oxidative electrolyte decomposition for Mg rechargeable batteries

Jonghyun Han, Shunsuke Yagi, T. Ichitsubo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

MgMn2O4 spinel oxide has a very positive redox potential (2–3 V vs. Mg/Mg2+) and is a promising positive electrode material for Mg rechargeable batteries. However, the charge of MgMn2O4 cannot be adequately accumulated due to oxidative electrolyte decomposition resulting in poor cyclability. We have examined the effect of transition metal ion substitution in Mg spinel oxides and demonstrated that oxidative electrolyte decomposition is suppressed by replacing Mn cations in MgMn2O4 with Fe. Tetragonal MgMn2O4 spinel was converted into cubic-phase Mg(Mn1−xFex)2O4, when 20% or more of its Mn3+ ions were replaced by Fe3+ (x = 0.2, 0.4, 0.6, 0.8, 1). Mixed Mn–Fe cubic spinel oxides exhibited enhanced cyclic performance due to the suppression of oxidative electrolyte decomposition and improved structural stability. This approach provides a means of improving the electrochemical performance of Mg battery systems without requiring thermodynamically stable electrolytes.

Original languageEnglish
Article number226822
JournalJournal of Power Sources
Volume435
DOIs
Publication statusPublished - 2019 Sep 30

Keywords

  • Catalytic activity
  • Mg rechargeable battery
  • Positive electrode
  • Spinel oxide

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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