Academy of Fundamental and Interdisciplinary Sciences, Department of Chemistry, Harbin Institute of Technology, Harbin, China.
ACS Appl Mater Interfaces. 2013 Jun 12;5(11):5057-63. doi: 10.1021/am400873e. Epub 2013 May 30.
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.
我们开发了一种巧妙的离子液体（IL）辅助原位合成铁氟化物/石墨烯纳米片（GNS）杂化纳米结构的方法。为了确保铁氟化物在石墨烯上均匀分散和紧密固定，我们使用了一种 IL，它不仅是铁氟化物纳米颗粒结晶的绿色氟源，也是 GNS 的分散剂。由于纳米颗粒和 GNS 之间形成了电子转移高速公路，铁氟化物/GNS 杂化阴极在容量和倍率性能方面都得到了显著改善（在 0.1 C 时为 230 mAh g(-1)，在 40 C 时为 74 mAh g(-1)）。铁氟化物纳米颗粒在 GNS 上的稳定附着也显著提高了长期循环性能（即使在 10 C 时，经过 250 次循环后仍有 115 mAh g(-1)）。这些铁氟化物/GNS 杂化物作为锂离子电池阴极的优异电化学性能归因于其杂化结构的稳健性以及铁氟化物纳米颗粒和石墨烯之间的协同作用。
