237. Flexible Electrospun Carbon Nanofiber@NiS Core-Sheath Hybrid Membranes as Binder-Free Anodes for Highly Reversible Lithium Storage.
writer：L. S. Zhang, Y. P. Huang, Y. F. Zhang, H. H. Gu, W. Fan,* T. X. Liu*
keywords：Electrospinning, Carbon Nanofibers, Binder-Free Anodes, Lithium Storage
source：期刊
specific source：Adv. Mater. Interfaces, 2016, 3(2), 1500467.
Issue time：2016年
The lithium storage performance of metal sulfi des is restricted by their intrinsic poor conductivity, large volumetric expansion, and involvement of insulating polymer binders during the electrode preparation process, which can be solved by constructing binder-free hybrid electrodes with nanostructured metal sulfi des grown on self-standing conductive
templates. In this work, flexible hybrid membranes with nickel sulfi de (NiS) nanoparticles uniformly anchored on electrospun carbon nanofi bers (CNFs) have been prepared as binder-free anodes for high-performance lithium-ion batteries. The hierarchical
CNF@NiS core/sheath hybrid membranes with 3D macroporous architecture can provide open and continuous channels for rapid diffusion of lithium ions to access the electrochemically active NiS nanoparticles. Moreover, the CNF can act as both a conductive core to provide effi cient transport of electrons for fast lithiation/delithiation of the NiS sheath, and as a buffering matrix to mitigate the local volumetric expansion/ contraction upon long-term cycling. As a consequence, the optimized
CNF@NiS hybrid membranes exhibit a high reversible capacity of 1149.4 mA h g
-1 with excellent cycling stability, and high rate capability of 664.3 mA h g
-1 even at a high current density of 3 A g
-1 , making them promising fl exible and binder-free anode materials for highly reversible lithium storage.