硫/多孔碳纳米管复合材料的制备及电化学性能

为了解决单质硫导电性差、充放电过程中体积膨胀、中间产物多硫化物的穿梭效应等问题，将硫负载于一种高比表面积的多孔碳纳米管（PCNTs），制备了S/PCNT复合材料，研究了其电化学性能。相比于S/CNT，S/PCNT的电化学性能有明显提升，这可归因于S/PCNT中的嵌入结构，为硫在充放电过程中的体积膨胀提供了缓冲空间，避免了硫与电解液的直接接触，进而有效限制多硫化物的溶解，从而缓解多硫化物的穿梭效应，使硫正极具有更好的循环稳定性。

Preparation and Electrochemical Properties of S/Porous Carbon Nanotube Composites

In order to solve the problems such as poor electrical conductivity of sulfur, the large volume expansion and the shuttle effect of intermediate polysulfides during the cycling process, the S/PCNT composites were prepared by introducing sulfur into porous carbon nanotubes (PCNTs), the electrochemical performance of S/PCNT was investigated. Compared with S/CNT, the electrochemical performance of S/PCNT has been significantly improved. This can be attributed to the embedded structure of S/PCNT, which has provided buffer space for the volume expansion during the charge and discharge process, avoided the direct contact between sulfur and electrolytes, restricted the dissolution of polysulfides, and alleviated the shuttle effect of polysulfides. Therefore, S/PCNT has better cycling stability.