The two-dimensional(2D)layered material molybdenum disulfide(MoS_(2))exhibits a special Mo-S-Mo sandwich structure with a rather large spacing,making it a promising candidate as an anode material for sodium storage ap...The two-dimensional(2D)layered material molybdenum disulfide(MoS_(2))exhibits a special Mo-S-Mo sandwich structure with a rather large spacing,making it a promising candidate as an anode material for sodium storage applications.Unfortunately,the practical applications are limited by their intrinsically low electrical conductivity,significant volume alteration and severe particle agglomeration.In this study,we designed a new two-step solvothermal strategy to synthesize ultrathin nanosheetassembled MoS_(2)hollow nanospheres strongly located onlignite-based carbon(MoS_(2)/C)without any template.The ultrathin nanosheets assembled into hollow structures mitigated the volume changes of MoS_(2)during the(dis)-charge cycles,facilitated Na+diffusion,and reduced the migration energy barrier within MoS_(2).Lignite-based C enhances the electrical conductivity of MoS_(2),prevents its aggregation,and alleviates mechanical stress during repeated(dis)charging.The resultant hollow spherical MoS_(2)/C composite exhibits outstanding cyclability and rate performance when used as an anode in sodium-ion batteries,as it delivers a high specific capacity of 515.8 mAh g^(-1)after 1000 cycles at 1.0 A g^(-1),with a 94.34%capacity retention rate.Even at a high current density of 20 Ag^(-1),a capacity of 431 mAh g^(-1)can still be obtained after 2000cycles.In particular,the initial Coulombic efficiency of the MoS_(2)anode is markedly enhanced by the incorporation of lignite-based C.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51962027 and 21968022)the Major Science and Technology Project of Inner Mongolia Autonomous Region(No.2021ZD0016)+5 种基金the National Key R&D Program of China(No.2020YFC1909105)the Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region(No.NJYT24002)the Central Guidance Fund for Local Scientific and Technological Development(No.2024ZY0012)the Key Project of Tianjin Natural Science Foundation(No.23JCZDJC00570)the Special Funding of China Postdoctoral Science Foundation(No.2023T160268)the China Postdoctoral Science Foundation(No.2023M741362)
文摘The two-dimensional(2D)layered material molybdenum disulfide(MoS_(2))exhibits a special Mo-S-Mo sandwich structure with a rather large spacing,making it a promising candidate as an anode material for sodium storage applications.Unfortunately,the practical applications are limited by their intrinsically low electrical conductivity,significant volume alteration and severe particle agglomeration.In this study,we designed a new two-step solvothermal strategy to synthesize ultrathin nanosheetassembled MoS_(2)hollow nanospheres strongly located onlignite-based carbon(MoS_(2)/C)without any template.The ultrathin nanosheets assembled into hollow structures mitigated the volume changes of MoS_(2)during the(dis)-charge cycles,facilitated Na+diffusion,and reduced the migration energy barrier within MoS_(2).Lignite-based C enhances the electrical conductivity of MoS_(2),prevents its aggregation,and alleviates mechanical stress during repeated(dis)charging.The resultant hollow spherical MoS_(2)/C composite exhibits outstanding cyclability and rate performance when used as an anode in sodium-ion batteries,as it delivers a high specific capacity of 515.8 mAh g^(-1)after 1000 cycles at 1.0 A g^(-1),with a 94.34%capacity retention rate.Even at a high current density of 20 Ag^(-1),a capacity of 431 mAh g^(-1)can still be obtained after 2000cycles.In particular,the initial Coulombic efficiency of the MoS_(2)anode is markedly enhanced by the incorporation of lignite-based C.
