Enhanced electrochemical properties of MgCo2O4 mesocrystals as a positive electrode active material for Mg batteries

Yoh Kotani, Ryuta Ise, Kanji Ishii, Toshihiko Mandai, Yuya Oaki, Shunsuke Yagi, Hiroaki Imai

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Mesocrystals of MgCo2O4 spinel oxide exhibiting porous and single-crystalline structures were synthesized by the reaction of magnesium ions with calcite-type CoCO3 mesocrystal precursors grown in micrometer-sized agar gels. The mesocrystals consisted of single-crystalline porous grains measuring 200–300 nm in diameter with iso-oriented subunits of approximately 10 nm. The single-crystalline porous framework structure of the MgCo2O4 mesocrystals enhanced the discharge capacity and positively shifted the discharge potential compared with MgCo2O4 nanoparticles prepared by the inverse co-precipitation method. These enhancements were attributed to a combination of the high specific surface areas of the mesocrystals and the high connectivity of the magnesium ion diffusion paths in the solid-phase.

Original languageEnglish
Pages (from-to)793-798
Number of pages6
JournalJournal of Alloys and Compounds
Publication statusPublished - 2018 Mar 30


  • Mesocrystal
  • Mg battery
  • Nanoparticle
  • Positive electrode
  • Spinel oxide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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