Synergies of the crystallinity and conductive agents on the electrochemical properties of the hollow Fe3O4spheres

Yuanfu Deng, Qiumei Zhang, Zhicong Shi, Lijun Han, Feng Peng, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)

Abstract

Monodispersed hollow Fe3O4spheres with different diameters and shell thickness were synthesized by a simple solvothermal process and were investigated as anode materials for lithium ion batteries (LIBs). The shell of the hollow spheres exhibited porous structure composed of aggregated Fe3O4nanoparticles. The composition and morphology of the obtained samples were characterized by X-ray powder diffraction (XRD), Raman spectra, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A novel formation mechanism was proposed based on the results of time-dependent reactions. The electrochemical tests of the hollow Fe3O4spheres were performed to determine the reversible capacity, rate and cycling performance as anode materials for LIBs. The Fe3O4obtained from the reaction at 200°C for 48 h exhibited the best specific capacity and capacity retention and superior rate performance compared to other Fe3O4spheres, which is ascribed to their reasonable particle size, high crystallinity and hollow spherical structures. Different conductive additive were used to investigate the electrochemical performance of Fe3O4hollow spheres. The binary conductive additives containing acetylene black (AB) and carbon nanobutes (CNTs) improved the electrochemical performance of the Fe3O4hollow spheres obviously. The results reveal that there is a synergistic effect of the particle size, crystallinity and conductive agents on the electrochemical properties of the hollow Fe3O4spheres.
Original languageEnglish
Pages (from-to)495-503
Number of pages9
JournalElectrochimica Acta
Volume76
DOIs
Publication statusPublished - 1 Aug 2012
Externally publishedYes

Keywords

  • Anode materials
  • High capacity
  • Hollow sphere
  • Lithium ion batteries
  • Magnetite

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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