WS2-Super P nanocomposites anode material with enhanced cycling stability for lithium ion batteries

WS2-Super P nanocomposites are prepared for lithium battery anodes by a simple two-step process consisting of hydrothermal and sulfide reduction reactions. The addition of Super P (50 nm) as a conductive addictive is beneficial for decreasing the size of nanocomposites and improving their dispersibility, which could accelerate the insertion/extraction reaction between WS2-Super P nanocomposite electrode and electrolyte. Compared to the pure WS2, the WS2-Super P nanocomposites exhibit highly improved electrochemical performance with initial discharge capacity of 421 mAh g(-1), high initial Coulombic efficiency (81%), low charge transfer impedance (53 Omega) and good retentive capacity of 389 mAh g(-1) after 200th cycles. The much improved electrochemical performance can be attributed to the incorporation of Super P, which facilitates the interface charge transfer and Li+ diffusion. (C) 2016 Elsevier B.V. All rights reserved.