Synergetic Effect of Yolk-Shell Structure and Uniform Mixing of SnS-MoS2 Nanocrystals for Improved Na-Ion Storage Capabilities

Seung Ho Choi, Yun Chan Kang

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Mixed metal sulfide composite microspheres with a yolk-shell structure for sodium-ion batteries are studied. Tin-molybdenum oxide yolk-shell microspheres prepared by a one-pot spray pyrolysis process transform into yolk-shell SnS-MoS2 composite microspheres. The discharge capacities of the yolk-shell and dense-structured SnS-MoS2 composite microspheres for the 100th cycle are 396 and 207 mA h g-1, and their capacity retentions measured from the second cycle are 89 and 47%, respectively. The yolk-shell SnS-MoS2 composite microspheres with high structural stability during repeated sodium insertion and desertion processes have low charge-transfer resistance even after long-term cycling. The synergetic effect of the yolk-shell structure and uniform mixing of the SnS and MoS2 nanocrystals result in the excellent sodium-ion storage properties of the yolk-shell SnS-MoS2 composite microspheres by improving their structural stability during cycling.

Original languageEnglish
Pages (from-to)24694-24702
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number44
DOIs
Publication statusPublished - 2015 Nov 11

Keywords

  • anode material
  • metal sulfide
  • nanostructure
  • sodium batteries
  • spray pyrolysis

ASJC Scopus subject areas

  • Materials Science(all)

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