Efficient polysulfides conversion on Mo2CTx MXene for high-performance lithium-sulfur batteries

• 作者: Qi Zhu Hong-Fei Xu Kai Shen Yong-Zheng Zhang Bin Li Shu-Bin Yang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: SPECIAL TOPIC:2D MATERIALS
• 页码范围: 311-318
• 页数: 8页
• 语种: 英文

摘要

The severe shuttle effect and sluggish redox kinetics of polysulfides hinder the application of lithium-sulfur bat-teries.Herein,delaminated Mo2CTx MXene nanosheets are derived by chemical etching approach and further applied as a sulfur host for sulfur spheres (S@Mo2CTx).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 pro-cess of lithium polysulfides.In addition,the S@Mo2CTx electrode delivered fast charge and lithium-ion transport due to the superior electric conductivity and low lithium-ion diffusion energy barrier of MXene nanosheets.As a result,the S@Mo2CTx electrode exhibits a high reversible capacity of 918 mAh·g-1 at 1.0C with good cycling sta-bility 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.