An in situ ionic-liquid-assisted synthetic approach to iron fluoride/graphene hybrid nanostructures as superior cathode materials for lithium ion batteries

Bingjiang Li, David W. Rooney, Naiqing Zhang*, Kening Sun

*Corresponding author for this work

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

A tactful ionic-liquid (IL)-assisted approach to in situ synthesis of iron fluoride/graphene nanosheet (GNS) hybrid nanostructures is developed. To ensure uniform dispersion and tight anchoring of the iron fluoride on graphene, we employ an IL which serves not only as a green fluoride source for the crystallization of iron fluoride nanoparticles but also as a dispersant of GNSs. Owing to the electron transfer highways created between the nanoparticles and the GNSs, the iron fluoride/GNS hybrid cathodes exhibit a remarkable improvement in both capacity and rate performance (230 mAh g-1 at 0.1 C and 74 mAh g-1 at 40 C). The stable adhesion of iron fluoride nanoparticles on GNSs also introduces a significant improvement in long-term cyclic performance (115 mAh g-1 after 250 cycles even at 10 C). The superior electrochemical performance of these iron fluoride/GNS hybrids as lithium ion battery cathodes is ascribed to the robust structure of the hybrid and the synergies between iron fluoride nanoparticles and graphene.

Original languageEnglish
Pages (from-to)5057-5063
Number of pages7
JournalACS Applied Materials and Interfaces
Volume5
Issue number11
DOIs
Publication statusPublished - 12 Jun 2013

Keywords

  • graphene
  • high rate
  • ionic liquid
  • iron fluoride
  • lithium ion batteries

ASJC Scopus subject areas

  • Materials Science(all)

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