Synthesis and electrochemical performance of graphene-like WS2
Graphene-like and platelike WS2 were obtained by solid-state reactions. High-resolution (HR) TEM, BET, and Raman scattering studies show that the graphene-like WS2 is a few-layer-structured material. It exhibits better electrochemical performances than the platelike WS2. Structural characterization indicates that metallic W and Li2S are the end products of discharge (0.01V versus Li+/Li), whereas metallic W and S are the recharge (3.00V) products. In addition, X-ray absorption near-edge structure (XANES) characterization shows that the d electrons of W deviate towards the Li (or S) atom during the discharge/charge process, thus forming a weak bond between W and Li2S (or S). Smashing the plate: Graphene-like WS2 exhibits better electrochemical performance than platelike WS2. XRD and X-ray absorption near-edge structure (XANES) analyses show that metallic W and Li2S are the products of discharge, whereas metallic W and S are the products of recharge (see figure). The d electrons of W deviate towards the Li (or S) atom during the discharge/charge process to form a weak bond between W and Li2S (or S). 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.