Synergistic performance of porous laminated tungsten disulfide/copper oxide/single-wall carbon nanotubes hybrids for lithium ions batteries

摘要

A novel ternary tungsten disulfide (WS2)/copper oxide (CuO)/single-wall carbon nanotubes (SWCNT) porous laminated hybrids are fabricated with the aid of electrostatic interaction and vacuum filtration. In which, the layered WS2 sheets are spaced by high electrochemical active CuO nanosheets and conductive SWCNT and form a unique sandwich-like porous structures. When used as a lithium ion batteries anode, it demonstrates high reversible specific capacity of 962.4 mA h g (1) at 0.1 A g (1) after 100 cycles and excellent rate capability, a reversible specific capacity of 418.1 mA h g (1) even at a high rate current density of 2 A g (1). The unique assembled WS2/CuO/SWCNT porous hybrids not only show the improved electrical conductivity, but also provide efficient charge transport channels for electrolyte penetration and sustain for the volume variation during the lithiation and delithiation. These synergistic effects significantly improve the electrochemical performances. The synthesis approach presented here would be extended to the other layered-based composites for energy applications. (C) 2014 Elsevier Ltd. All rights reserved.