Preparation of MgCo2O4/graphite composites as cathode materials for magnesium-ion batteries

  • Siyong Gu
  • Chien-Te HsiehEmail author
  • Mohammad Mahmudul Huq
  • Jo-Pei Hsu
  • Yasser Ashraf Gandomi
  • Jianlin LiEmail author
Original Paper


Magnesium-ion batteries are fabricated with MgCo2O4/graphite composites as the cathode material. MgCo2O4 nanoparticles are prepared using a co-precipitation method. A three-dimensional mixing process is utilized to mechanically decorate MgCo2O4 nanoparticles on graphite particles. The MgCo2O4 spinel crystals of size ranging from 20 to 70 nm on micrometer-sized graphite chunks are analyzed by using X-ray diffraction and scanning electron microscopy. The electrochemical properties of the as-prepared composites are well characterized by cyclic voltammetry, charge and discharge cycling, and electrochemical impedance spectroscopy (EIS). Surprisingly, the MgCo2O4/graphite composite with a relatively low proportion of MgCo2O4, compared with the other as-prepared composites, achieves the highest specific capacity of 180 mAh g−1 at a C rate of 0.05 C. EIS results suggest that the electrical conductivity of the composite material is an increasing function of the graphite proportion. The superior performance of the MgCo2O4/graphite composite could be ascribed to the decoration of nanosized MgCo2O4 particles as well as to the increased conductivity provided by graphite.


Mg-ion battery Cathode Spinel structure Composite Magnesium cobaltite Graphite composites 


Funding information

The authors are very grateful to Ministry of Science and Technology, Taiwan, for the financial support.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Fujian Provincial Key Laboratory of Functional Materials and Applications, School of Materials Science and EngineeringXiamen University of TechnologyXiamenChina
  2. 2.Department of Chemical Engineering and Materials ScienceYuan Ze UniversityTaoyuanTaiwan
  3. 3.Department of Mechanical, Aerospace and Biomedical EngineeringUniversity of TennesseeKnoxvilleUSA
  4. 4.Department of Chemical and Biological EngineeringUniversity of SaskatchewanSaskatoonCanada
  5. 5.Department of Chemical EngineeringMassachusetts Institute of TechnologyCambridgeUSA
  6. 6.Energy and Transportation Science DivisionOak Ridge National LaboratoryOak RidgeUSA

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