Graphene anchored with Fe 3O 4 nanoparticles as anode for enhanced Li-ion storage

Marappan Sathish, Takaaki Tomai, Itaru Honma

Research output: Contribution to journalArticlepeer-review

103 Citations (Scopus)

Abstract

Magnetite (Fe 3O 4) nanoparticles anchored graphene nanocomposites with different weight ratios of Fe 3O 4 and graphene nanosheets (GNSs) were prepared using hydrothermal method. The X-ray diffraction (XRD) pattern of the prepared nanocomposite reveals the presence of face centered cubic hexagonal crystalline Fe 3O 4 nanoparticles. Raman spectroscopic studies of the nanocomposites confirm the co-existence of Fe 3O 4 and graphene. The electron microscopy images of the nanocomposites revealed the formation of homogeneous nanocrystalline Fe 3O 4 particles on GNS surface. Among the three studied weight ratios (28:72, 40:60 and 60:40), the charge-discharge profile of the nanocomposite electrodes indicates that nanocomposite with 40:60 wt% of Fe 3O 4 and GNS as high capacity (930 mAh g -1) electrode for the lithium-ion (Li-ion) storage. And, the Li-ion storage capacity of the above nanocomposite is much higher than the pure GNS and Fe 3O 4 nanoparticle electrodes. The charge-discharge cycling study indicates that the Fe 3O 4/GNS (40:60) nanocomposite electrode has very high reversible capacity of 675 mAh g -1 with columbic efficiency of 97% after 50 cycles. The rate performance of the Fe 3O 4/GNS (40:60) nanocomposite electrode shows high reversible capacities at high rates due to the high conductive GNS support. The cyclic voltammetry experiment reveals the irreversible and reversible Li-ion storage in Fe 3O 4/GNS during the first and subsequent cycles. Highlights: Fe 3O 4/GNS nanocomposites were prepared at very dilute and hydrothermal condition. Effect of Fe 3O 4/GNS ratio on the Li-ion storage capacity has been examined. High reversible capacity of 930 and 675 mAh g -1 was attained for 2nd and 50th cycles, respectively. Enhanced performance was attributed to the advantages of the electrodes' structure.

Original languageEnglish
Pages (from-to)85-91
Number of pages7
JournalJournal of Power Sources
Volume217
DOIs
Publication statusPublished - 2012 Nov 1

Keywords

  • Anode materials
  • Energy storage
  • Fe O
  • Graphene
  • Li-ion battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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