The preparation of nano-sulfur/MWCNTs and its electrochemical performance

In this work a novel nano-sulfur/MWCNTs composite with modified multi-wall carbon nano-tubes (MWCNTs) as sulfur-fixed matrix for Li/S battery is reported Based on different solubility of sulfur in different solvents nano-sulfur/MWCNTs composite was prepared by solvents exchange method The composite was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) The modified MWCNTs are considered that not only acts as a conducting material but also a matrix for sulfur The electrochemical performance of the nano-sulfur/MWCNTs composite was tested The results indicated that nano-sulfur/MWCNTs composite had the specific capacity of 1380 mAh g(-1) 1326 mAh g(-1) and 1210 mAh g(-1) in the initial cycle at 100 mA g(-1) 200 mAg(-1) and 300 mAh g(-1) discharge rates respectively and remained a reversible capacity of 1020 mAh g(-1) 870 mAh g(-1) and 810 mAh g(-1) after 30 cycles The electrochemical performances confirm that the modified MWCNTs as sulfur-fixed matrix show better ability than any other carbon in cathode of Li/S batteries that had been reported (C) 2010 Elsevier Ltd All rights reserved