Promoting Reversible Cathode Reactions in Magnesium Rechargeable Batteries Using Metastable Cubic MgMn2O4Spinel Nanoparticles

Hiroaki Kobayashi, Kouta Samukawa, Masanobu Nakayama, Toshihiko Mandai, Itaru Honma

Research output: Contribution to journalArticlepeer-review

Abstract

Magnesium rechargeable batteries are candidates for post-lithium-ion batteries owing to the low price and superior theoretical volume energy density of Mg anodes. As a promising cathode material, MgMn2O4 spinel has a high energy density with a high operating voltage, and a relatively high ionic conductivity. However, the tetragonal symmetry of MgMn2O4, originating from the Jahn-Teller effect of Mn3+ ions, causes irreversible structural changes during the charge/discharge process, leading to poor reversibility. We developed metastable cubic MgMn2O4 spinel nanoparticles using the hot-injection method under low-temperature solvothermal conditions. Compared to tetragonal MgMn2O4, its cubic phase exhibited a superior reversible capacity, both experimentally and theoretically, at room temperature.

Original languageEnglish
Pages (from-to)8328-8333
Number of pages6
JournalACS Applied Nano Materials
Volume4
Issue number8
DOIs
Publication statusPublished - 2021 Aug 27

Keywords

  • cathode materials
  • magnesium-ion batteries
  • metastable
  • Mg-Mn spinel oxides
  • nanoparticles

ASJC Scopus subject areas

  • Materials Science(all)

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