Hierarchical Ti₃C₂/TiO₂/MoS₂ Composite as an Anode Material for Sodium-ion Batteries

Abstract

MoS₂ with a large interlayer spacing of 6.24 Å (1 Å=0.1 nm) and a high theoretical capacity of 678 mA·h·g^-1 is recognized as a potential electrode candidate for sodium-ion batteries. However, its agglomeration tendency and volume change upon the charge/discharge cycling lead to fast capacity decay and poor cyclic stability. In this work, a hierarchical Ti₃C₂/TiO₂/MoS₂ composite was prepared to improve the electrochemical performance of MoS₂. Ti₃C₂T _x MXene was used as a conductive agent and mechanical support, while zero-strain TiO₂ generated through the in-situ oxidization of Ti₃C₂T _x MXene was utilized as a structural stabilizer. Compared with Ti₃C₂/TiO₂, Ti₃C₂, and MoS₂, the Ti₃C₂/TiO₂/MoS₂ composite exhibited excellent electrochemical performance: a high specific capacity of 413.6 mA·h·g^-1 was retained after charge/discharge at 0.1 A/g for 100 cycles and a high rate capacity of 302.2 mA·h·g^-1 was achieved at 8.0 A/g as an anode material for sodium-ion batteries. Therefore, this work sheds light on the development of MoS₂-based materials for anodes of sodium-ion batteries.

Keywords

Transition metal dichalcogenide / MXene / TiO₂ / Anode material / Electrochemical performance / Sodium-ion battery

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