首页|Sulfur vacancies and heterogeneous interfaces promote high performance sodium storage of bimetallic chalcogenide hollow nanospheres
Sulfur vacancies and heterogeneous interfaces promote high performance sodium storage of bimetallic chalcogenide hollow nanospheres
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Transition metal sulfides have high theoretical capacities and are considered as potential anode materials for sodium-ion batteries.However,due to low inherent conductivity and significant volume expansion,the electrochemical performance is greatly limited.In this study,a nickel/manganese sulfide material(Ni0.96Sx/MnSy-NC)with adjustable sulfur vacancies and heterogeneous hollow spheres was prepared using a simple method.The introduction of a concentration-adjustable sulfur vacancy enables the gener-ation of a heterogeneous interface between bimetallic sulfide and sulfur vacancies.This interface collec-tively creates an internal electric field,improving the mobility of electrons and ions,increasing the number of electrochemically active sites,and further optimizing the performance of Na+storage.The direction of electron flow is confirmed by Density functional theory(DFT)calculations.The hollow nano-spherical material provides a buffer for expansion,facilitating rapid transfer kinetics.Our innova-tive discovery involves the interaction between the ether-based electrolyte and copper foil,leading to the formation of Cu9S5,which grafts the active material and copper current collector,reinforcing mechan-ical supporting.This results in a new heterostructure of Cu9S5 with Ni0.96Sx/MnSy,contributing to the sta-bilization of structural integrity for long-cycle performance.Therefore,Ni0.96Sx/MnSy-NC exhibits excellent electrochemical properties following our modification route.Regarding stability performance,Ni0.96Sx/MnSy-NC demonstrates an average decay rate of 0.00944％after 10,000 cycles at an extremely high current density of 10000 mA g-1.A full cell with a high capacity of 304.2 mA h g-1 was also success-fully assembled by using Na3V2(PO4)3/C as the cathode.This study explores a novel strategy for inter-face/vacancy co-modification in the fabrication of high-performance sodium-ion batteries electrode.
Sulfur vacanciesHeterogeneous interfaceInteractionsSodium ion batteries
Shiyue Cao、Xiaoting Xu、Qiming Liu、Huijuan Zhu、Ting Hu
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Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education,School of Physics and Technology,Wuhan University,Wuhan 430072,Hubei,China
National Nature Science Foundation of Jiangsu Province
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