Hierarchical Zn 1.67 Mn 1.33 O 4 /graphene nanoaggregates as new anode material for lithium-ion batteries

Jae Wan Lee, Seung Deok Seo, Dong-Wan Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Cubic spinel type Zn 1.67 Mn 1.33 O 4 porous sub-micro spheres were synthesized by the calcination of solvothermally prepared Zn x Mn 1 − x CO 3 precursor powders and evaluated as new anode materials for Li-ion batteries for the first time. Each sphere exhibited aggregated morphology, constructed entirely from nanoparticles with a primary particle size of 11 nm. Electrochemical investigations and ex-situ transmission electron microscopy analyses revealed that the reaction mechanism of obtained Zn 1.67 Mn 1.33 O 4 nanoaggregates is the combined conversion and alloying reaction, similar to that of ZnMn 2 O 4 systems. In favor of the uniform porous sphere structure, these resulting Zn 1.67 Mn 1.33 O 4 nanoaggregates enabled the mitigation of volume change upon cycling. In addition, graphene composites with Zn 1.67 Mn 1.33 O 4 nanoaggregates were fabricated to improve electrical conductivity, simply by adding graphenes during solvothermal reaction for the formation of Zn x Mn 1 − x CO 3 precursors. Zn 1.67 Mn 1.33 O 4 /graphene composites showed a capacity of 670 mA h g −1 higher than that of pure Zn 1.67 Mn 1.33 O 4 (518 mA h g −1 ) after 200 cycle at a current density of 100 mA g −1 .

Original languageEnglish
JournalInternational Journal of Energy Research
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • cubic spinel structure anode
  • lithium-ion batteries
  • nanoaggregates
  • transition metal oxide
  • Zn Mn O /graphene

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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