3D MoS 2 -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

380 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 MoS 2 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 MoS 2 -graphene composite microspheres may be attributed to the reduced stacking of the MoS 2 layers and to the 3D structure of the porous graphene microspheres. The reduced stacking of the MoS 2 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

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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