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 f...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.展开更多
Energy storage devices based on organic liquid electrolyte are still suffered from safety issues. Therefore, developing the solid state batteries based on solid electrolytes is an inevitable choice because of the high...Energy storage devices based on organic liquid electrolyte are still suffered from safety issues. Therefore, developing the solid state batteries based on solid electrolytes is an inevitable choice because of the high safety. However, the practical applications of solid state batteries have been still suffered fiom some drawbacks, including the low ionic conductivity at room temperature, narrow electrochemical window, and weak chemical/electrochemical stability of solid-state electrolytes, the dendrite on metal anodes, and poor interfacial compatibility between electrodes and electrolytes.展开更多
基金This study was financially supported by the National Natural Science Foundation of China(Nos.51572007 and 51622203).
文摘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.
文摘Energy storage devices based on organic liquid electrolyte are still suffered from safety issues. Therefore, developing the solid state batteries based on solid electrolytes is an inevitable choice because of the high safety. However, the practical applications of solid state batteries have been still suffered fiom some drawbacks, including the low ionic conductivity at room temperature, narrow electrochemical window, and weak chemical/electrochemical stability of solid-state electrolytes, the dendrite on metal anodes, and poor interfacial compatibility between electrodes and electrolytes.
