3D MoS2-graphene microspheres consisting of multiple nanospheres with superior sodium ion storage properties

Seung Ho Choi, You Na Ko, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

491 Citations (Scopus)

Abstract

A novel anode material for sodium-ion batteries consisting of 3D graphene microspheres divided into several tens of uniform nanospheres coated with few-layered MoS2 by a one-pot spray pyrolysis process is prepared. The first discharge/charge capacities of the composite microspheres are 797 and 573 mA h g-1 at a current density of 0.2 A g-1. The 600th discharge capacity of the composite microspheres at a current density of 1.5 A g-1 is 322 mA h g-1. The Coulombic efficiency during the 600 cycles is as high as 99.98%. The outstanding Na ion storage properties of the 3D MoS2-graphene composite microspheres may be attributed to the reduced stacking of the MoS2 layers and to the 3D structure of the porous graphene microspheres. The reduced stacking of the MoS2 layers relaxes the strain and lowers the barrier for Na+ insertion. The empty nanospheres of the graphene offer voids for volume expansion and pathways for fast electron transfer during repeated cycling.

Original languageEnglish
Pages (from-to)1780-1788
Number of pages9
JournalAdvanced Functional Materials
Volume25
Issue number12
DOIs
Publication statusPublished - 2015 Mar 25

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords

  • 3D graphene
  • anode materials
  • metal sulfide
  • sodium-ion batteries
  • spray pyrolysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • General Chemistry
  • General Materials Science
  • Electrochemistry
  • Biomaterials

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