An In Situ Ionic-Liquid-Assisted Synthetic Approach to Iron Fluoride/Graphene Hybrid Nanostructures as Superior Cathode Materials for Lithium Ion Batteries
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- 作者：Bingjiang Li ; David W. Rooney ; Naiqing Zhang ; Kening Sun
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2013
- 出版时间：June 12, 2013
- 年：2013
- 卷：5
- 期：11
- 页码：5057-5063
- 全文大小：415K
- 年卷期：v.5,no.11(June 12, 2013)
- ISSN：1944-8252
文摘
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鈥? at 0.1 C and 74 mAh g鈥? 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鈥? 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.