Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 11, Pages 5057-5063Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am400873e
Keywords
graphene; high rate; ionic liquid; iron fluoride; lithium ion batteries
Funding
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2013TS08]
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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.
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