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

✍ Scribed by Chen Jia-jia; Jia Xin; She Qiu-jie; Wang Chong; Zhang Qian; Zheng Ming-sen; Dong Quan-feng

• Book ID: 103828127
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 324 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.01.069

✦ Synopsis

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 mA g -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.