硫/多孔碳纳米管复合材料的制备及电化学性能  

Preparation and Electrochemical Properties of S/Porous Carbon Nanotube Composites

作　　者：陈培 梁文浩 唐亚昆 高杨 盛蕊[1] 刘浪[1] CHEN Pei;LIANG Wen-Hao;TANG Ya-Kun;GAO Yang;SHENG Rui;LIU Lang(State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,College of Chemistry,Xinjiang University,Urumqi 830017,China)

机构地区：[1]新疆大学化学学院,省部共建碳基能源资源化学与利用国家重点实验室,乌鲁木齐830017

出　　处：《无机化学学报》2022年第5期805-811,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.51902277,51672235)资助。

摘　　要：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。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.

关 键 词：锂硫电池 正极 硫 多孔碳纳米管 

分 类 号：O646.21[理学—物理化学]