【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 s
【机 构】
：
School of Materials Science and Engineering,Beihang University,Beijing 100191,China
论文部分内容阅读
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.
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