Crumpled graphene-molybdenum oxide composite powders: Preparation and application in lithium-ion batteries

Seung Ho Choi, Yun Chan Kang

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Crumpled graphene-MoO2 composite powders are directly prepared by means of spray pyrolysis and from a stable graphene oxide colloidal solution in the presence of Mo ions. The crumpled graphene-MoO2 composite powders are transformed into MoO3-based composite powders after post-treatment at 300C. The transmission electron microscopy and dot-mapping images of the post-treatment composite powders show uniform distribution of MoO3 nanocrystals in the crumpled graphene powders. The two typical D and G bands of graphene are observed at 1350 and 1590?cm-1, respectively, in the Raman spectrum of the graphene-MoO3 composite. In addition, the crumpled graphene-MoO3 powders exhibit superior electrochemical behavior compared to that of pure MoO3 as an anode material for lithium-ion batteries. The initial discharge capacities of the graphene-MoO3 composite and bare MoO3 powders at a current density of 2?Ag-1 are 1490 and 1225?mAhg-1, respectively. The capacity retention of the graphene-MoO3 composite is 87% after the first cycle, whereas that of bare MoO3 is 47%, as measured after 100 cycles. The reversible discharge capacity of the graphene-MoO3 composite decreases slightly from 1228 to 845?mAhg-1 as the current density increases from 0.5 to 3?Ag-1.

Original languageEnglish
Pages (from-to)523-528
Number of pages6
JournalChemSusChem
Volume7
Issue number2
DOIs
Publication statusPublished - 2014 Feb 1

Keywords

  • anode materials
  • electrochemistry
  • graphene
  • lithium-ion batteries
  • molybdenum oxide

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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