Carbon Nanohorns Carried Iron Fluoride Nanocomposite with ultrahigh rate lithium ion storage properties

Novel hierarchical carbon nanohorns (CNHs) carried iron fluoride nanocomposites have been constructed by direct growth of FeF(3)·0.33H(2)O nanoparticles on CNHs. In the FeF(3)·0.33H(2)O@CNHs nanocomposite, the mesopore CNHs play the role as conductive matrix and robust carrier to support the FeF(3)·0.33H(2)O nanoparticles. The intimate conductive contact between the two components can build up an express way of electron transfer for rapid Li(+) insertion/extraction. The CNHs can not only suppress the growth and agglomeration of FeF(3)·0.33H(2)O during the crystallization process, but also sever as an “elastic confinement” to support FeF(3)·0.33H(2)O. As was to be expected, the hierarchical FeF(3)·0.33H(2)O@CNHs nanocomposite exhibits impressive rate capability and excellent cycle performance. Markedly, the nanocomposite proves stable, ultrahigh rate lithium ion storage properties of 81 mAh g(−1) at charge/discharge rate of 50 C (a discharge/charge process only takes 72 s). The integration of high electron conductivity, confined nano sized FeF(3)·0.33H(2)O (~5 nm), hierarchical mesopores CNHs and the “elastic confinement” support, the FeF(3)·0.33H(2)O@CNHs nanocomposite demonstrates excellent ultrahigh rate capability and good cycling properties.