Hierarchical Ti_(3)C_(2)/TiO_(2)/MoS_(2) Composite as an Anode Material for Sodium-ion Batteries

MoS_(2) with a large interlayer spacing of 6.24Å(1Å=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 Ti_(3)C_(2)/TiO_(2)/MoS_(2) composite was prepared to improve the electrochemical performance of MoS_(2).Ti_(3)C_(2)Tx MXene was used as a conductive agent and mechanical support,while zero-strain TiO_(2) generated through the in-situ oxidization of Ti_(3)C_(2)Tx MXene was utilized as a structural stabilizer.Compared with Ti_(3)C_(2)/TiO_(2),Ti_(3)C_(2),and MoS_(2),the Ti_(3)C_(2)/TiO_(2)/MoS_(2) 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 MoS_(2)-based materials for anodes of sodium-ion batteries.