As a novel material,high-entropy compounds have attracted extensive attention in the field of lithium–sulfur battery host materials due to their diverse elemental composition with a wide range of properties.The abili...As a novel material,high-entropy compounds have attracted extensive attention in the field of lithium–sulfur battery host materials due to their diverse elemental composition with a wide range of properties.The ability to effectively mitigate the shuttle effect of lithium polysulfides and catalyze the bidirectional conversion of Li_(2)S_(2)/Li_(2)S is crucial to enhance the overall performance of the battery.In this study,a unique sulfur host nanosized highentropy material comprising selenium-doped HEO(AlCrFeCoNi)_(3)O_(4-x)-Se_(x)is fabricated using an in situ thermal reduction and selenylation method.In the high-entropy compounds,the introduction of Se causes that the generation of oxygen vacancies during the lattice distortion serves as ion transfer pathway and the formation of M-Se bonds provides a high adsorption capability for LiPSs.Moreover,the polymetallic cooperative high-entropy nanoparticles also provide numerous active sites favoring redox kinetics of the sulfur electrode.The resulting selenium-doped HEO(AlCrFeCoNi)_(3)O_(4-x)-Se_(x)not only enhances discharge capacity but also maintains excellent capacity cycling stability.As a result,the HEO-Se/S composite exhibits a specific capacity of 1233.9 mAh g^(-1)at 0.1C and experiences minimal capacity fading at a rate of 0.038%per cycle over 500 cycles at 0.2C,while host materials with sulfur loading of 4.33 mg cm^(-2)and E/S ratio of 5.88μL mg^(-1)exhibit excellent capacity retention after 100 cycles at 0.2C.This work offers new insights into synthesizing high-entropy nanomaterials for improving the electrochemical performance of Li–S batteries.展开更多
基金supported by Jilin Province Science and Technology Development Project(Nos.20250102158JC,20240302035GX)
文摘As a novel material,high-entropy compounds have attracted extensive attention in the field of lithium–sulfur battery host materials due to their diverse elemental composition with a wide range of properties.The ability to effectively mitigate the shuttle effect of lithium polysulfides and catalyze the bidirectional conversion of Li_(2)S_(2)/Li_(2)S is crucial to enhance the overall performance of the battery.In this study,a unique sulfur host nanosized highentropy material comprising selenium-doped HEO(AlCrFeCoNi)_(3)O_(4-x)-Se_(x)is fabricated using an in situ thermal reduction and selenylation method.In the high-entropy compounds,the introduction of Se causes that the generation of oxygen vacancies during the lattice distortion serves as ion transfer pathway and the formation of M-Se bonds provides a high adsorption capability for LiPSs.Moreover,the polymetallic cooperative high-entropy nanoparticles also provide numerous active sites favoring redox kinetics of the sulfur electrode.The resulting selenium-doped HEO(AlCrFeCoNi)_(3)O_(4-x)-Se_(x)not only enhances discharge capacity but also maintains excellent capacity cycling stability.As a result,the HEO-Se/S composite exhibits a specific capacity of 1233.9 mAh g^(-1)at 0.1C and experiences minimal capacity fading at a rate of 0.038%per cycle over 500 cycles at 0.2C,while host materials with sulfur loading of 4.33 mg cm^(-2)and E/S ratio of 5.88μL mg^(-1)exhibit excellent capacity retention after 100 cycles at 0.2C.This work offers new insights into synthesizing high-entropy nanomaterials for improving the electrochemical performance of Li–S batteries.
