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 language | English |
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Pages (from-to) | 5057-5063 |
Number of pages | 7 |
Journal | ACS Applied Materials and Interfaces |
Volume | 5 |
Issue number | 11 |
DOIs | |
Publication status | Published - 12 Jun 2013 |
Keywords
- graphene
- high rate
- ionic liquid
- iron fluoride
- lithium ion batteries
ASJC Scopus subject areas
- General Materials Science