Flexible Electrospun Carbon Nanofiber@NiS Core/Sheath Hybrid Membranes as Binder‐Free Anodes for Highly Reversible Lithium Storage

• DOI: 10.1002/admi.201500467
• Publication Date: 2015-10-30T10:14:45Z
• Authors: Longsheng Zhang; Yunpeng Huang; Youfang Zhang; Huahao Gu; Wei Fan; Tianxi Liu
• Keywords: Electrospinning; Sulfidation; Nickel sulfide; Carbon fibers

The lithium storage performance of metal sulfides is restricted by their intrinsic poor conductivity, large volumetric expansion, and involvement insulating polymer binders during the electrode preparation process, which can be solved constructing binder‐free hybrid electrodes with nanostructured grown on self‐standing conductive templates. In this work, flexible membranes nickel sulfide (NiS) nanoparticles uniformly anchored electrospun carbon nanofibers (CNFs) have been prepared as anodes for high‐performance lithium‐ion batteries. hierarchical CNF@NiS core/sheath 3D macroporous architecture provide open continuous channels rapid diffusion ions to access electrochemically active NiS nanoparticles. Moreover, CNF act both a core efficient transport electrons fast lithiation/delithiation sheath, buffering matrix mitigate local expansion/contraction upon long‐term cycling. As consequence, optimized exhibit high reversible capacity 1149.4 mA h g −1 excellent cycling stability, rate capability 664.3 even at current density 3 A , making them promising anode materials highly storage.