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Versatile Interfacial Self-Assembly of Ti3C2Tx MXene Based Composites with Enhanced Kinetics for Superior Lithium and Sodium Storage

Zhengguang Zou, , , , Ke Ye, ,
Published: 13 July 2021

Abstract: Exploring nanostructured transition-metal sulfide anode materials with excellent electrical conductivity is the key point for high-performance alkali metal ion storage devices. Herein, we propose a powerful bottom-up strategy for the construction of a series of sandwich-structured materials by a rapid interfacial self-assembly approach. Oleylamine could act as a functional reagent to guarantee that the nanomaterials self-assemble with MXene. Benefiting from the small size of Co-NiS nanorods, excellent conductivity of MXene, and sandwiched structure of the composite, the Co-NiS/MXene composite could deliver a high discharge capacity of 911 mAh g–1 at 0.1 A g–1 for lithium-ion storage. After 200 cycles at 0.1 A g–1, a high specific capacity of 1120 mAh g–1 could be still remaining, indicating excellent cycling stability. For sodium-ion storage, the composite exhibits high specific capacity of 541 mAh g–1 at 0.1 A g–1 and excellent rate capability (263 mAh g–1 at 5 A g–1). This work offers a straightforward strategy to design and construct MXene-based anode nanomaterials with sandwiched structure for high-performance alkali metal ion storage and even in other fields.
Keywords: MXene / oleylamine / interfacial self-assembly / NiS / batteries

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