Bimetallic Sulfide/Sulfur Doped T₃C₂T _x MXene Nanocomposites as High-performance Anode Materials for Sodium-ion Batteries

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 Co _xFe_1−xS₂ bimetallic sulfide/sulfur-doped Ti₃C₂ MXene nanocomposites(Co _xFe_1−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, Co _xFe_1−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).

Keywords

Bimetallic sulfide / Ti₃C₂ MXene / Sulfur doping / Anode material / Sodium-ion battery

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