Efficient polysulfides conversion on Mo_(2)CT_(x)MXene for highperformance lithium–sulfur batteries  

作　　者：Qi Zhu Hong-Fei Xu Kai Shen Yong-Zheng Zhang Bin Li Shu-Bin Yang 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Rare Metals》2022年第1期311-318,共8页稀有金属（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(Nos.51572007 and 51622203).

摘　　要：The severe shuttle effect and sluggish redox kinetics of polysulfides hinder the application of lithium–sulfur batteries.Herein,delaminated Mo_(2)CT_(x) MXene nanosheets are derived by chemical etching approach and further applied as a sulfur host for sulfur spheres(S@Mo_(2)CT_(x)).In the MXene encapsulated architecture,the external MXene nanosheets not only immobilize the soluble polysulfides by strong chemical adsorption but also efficiently catalyze the liquid–liquid conversion and liquid–solid nucleation process of lithium polysulfides.In addition,the S@Mo_(2)CT_(x) electrode delivered fast charge and lithium-ion transport due to the superior electric conductivity and low lithiumion diffusion energy barrier of MXene nanosheets.As a result,the S@Mo_(2)CT_(x) electrode exhibits a high reversible capacity of 918 mAh·g^(-1) at 1.0C with good cycling stability and a high areal capacity of 7.0 mAh·cm^(-2) with sulfur loading of 7.4 mg·cm^(-2) under a lean electrolyte condition.

关 键 词：LITHIUM MXene ELECTRODE 

分 类 号：TM912[电气工程—电力电子与电力传动]