Flower‐like Hierarchical Ti3C2Tx@MoS2/Nitrogen‐doped Carbon Composite as High‐performance Anodes for Sodium‐ion Batteries

• Published in: Batteries & supercaps 2024-02, Vol.7 (2), p.n/a
• Main Authors: Dong, Guangsheng, Li, Lixin, Cui, Penghui, Mohamed, A. M. A., Zhu, Kai, Cao, Dianxue
• Format: Article
• Language: English
• Subjects: interlayer spacing; MoS2; sandwich complexes; sodium-ion batteries; Ti3C2Tx
• ISSN: 2566-6223; 2566-6223
• DOI: 10.1002/batt.202300391

The lack of high‐performance electrodes is a key factor restricting the development of sodium‐ion batteries (SIBs), and usually a certain type of electrode material alone often fails to combine the merits of high capacity and good conductivity. Herein, nitrogen‐doped carbon (NC) was used as a multifunctional bridge to uniformly compound high‐capacity MoS2 nanoparticles with highly conductive Ti3C2Tx nanosheets to form Ti3C2Tx@MoS2/NC composite with flower‐like architecture. Ultrafine MoS2 nanoparticles were uniformly anchored on Ti3C2Tx nanosheets to form nanosheets primary building blocks with a sandwich‐like architecture, which not only shortens the ion transfer distance but also enlarges the layer spacing of Ti3C2Tx favoring the storage of more sodium ions as well as their transport capacity. Moreover, the flower‐like structures with abundant edges can provide an ample active sites and high pseudocapacitance behavior. As a result, flower‐like Ti3C2Tx@MoS2/NC displays a high electrochemical properties with an excellent cycling stability over 2000 cycles (81.4 % capacity retention) and preeminent rate capacity of 383 mAh g−1 at 30 A g−1. Furthermore, Ti3C2Tx@MoS2/NC‖Na3V2(PO4)3 full cell displays a capacity of 59 mAh g−1 at 0.4 A g−1 after 180 cycles. This work displays a high‐performance anode composite for SIBs and provides insight into the preparation of other composites. Hierarchical Ti3C2Tx@MoS2/NC composite: The flower‐like Ti3C2Tx@MoS2/NC combining the advantages of high electrical conductivity and cycling stability of Ti3C2Tx and the high specific capacity of MoS2 were prepared by a combination of complexation, polymerization and sulfidation reactions. Its use as an anode material for sodium‐ion batteries demonstrated excellent electrochemical performance.