The preparation of nano-sulfur/MWCNTs and its electrochemical performance |
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Authors: | Chen Jia-jia |
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Affiliation: | State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China |
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Abstract: | 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. |
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Keywords: | Nano-sulfur/MWCNTs composite Sulfur-fixed matrix Modified MWCNTs Lithium-sulfur battery Nanomaterial |
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