Abstract
The application of transition metal dichalcogenides(TMDs) as anode materials in sodium-ion batteries (SIBs) has been hindered by low conductivity and poor cyclability. Herein, we report the synthesis of CoxFe1−xS2 bimetallic sulfide/sulfur-doped Ti3C2 MXene nanocomposites(CoxFe1−xS2@S-Ti3C2) by a facile co-precipitation process and thermal-sulfurization reaction. The interconnected 3D frameworks consisting of MXene nanosheets can effectively buffer the volume change and enhance the charge transfer. In particular, sulfur-doped MXene nanosheets provide rich active sites for sodium storage and restrain sulfur loss during charging/discharging processes, leading the increase of specific capacity and cycling the stability of anode materials. As a result, CoxFe1−xS2@S-Ti3C2 anodes exhibited high capacity, high rate capability and long cycle life(399 m·Ah/g at 5 A/g with an 94% capacity retention after 600 cycles).
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Supported by the National Natural Science Foundation of China(No.21573110) and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD), China.
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Bimetallic Sulfide/Sulfur Doped T3C2Tx MXene Nanocomposites as High-performance Anode Materials for Sodium-ion Batteries
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Zang, R., Li, P. & Wang, G. Bimetallic Sulfide/Sulfur Doped T3C2Tx MXene Nanocomposites as High-performance Anode Materials for Sodium-ion Batteries. Chem. Res. Chin. Univ. 36, 431–438 (2020). https://doi.org/10.1007/s40242-020-0120-4
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DOI: https://doi.org/10.1007/s40242-020-0120-4