Ti3C2Tx with a hydroxyl-rich surface for metal sulfides as high performance electrode materials for sodium/lithium storage

Three kinds of Ti3C2Tx modified metal sulfide composites have been prepared via a universal one-step strategy. First, three Ti3C2Tx MXene supported MoS3 composites with different surface F/O ratios and layer distances are synthesized. The abundant -OH groups on the surface of LiOH-treated Ti3C2Tx facilitate the effective bonding with MoS3, forming a robust sandwich-like structure (LF/O-Ti3C2Tx/MoS3). As anode material for sodium-ion batteries (SIBs), it shows outstanding long-term cycling performance in comparison with the other two Ti3C2Tx supported MoS3 composites. Its reversible capacity can be maintained at 611 mA h g(-1) after 1000 long cycles at 2 A g(-1), obviously superior to those of single LF/O-Ti3C2Tx and MoS3. Besides SIBs, LF/O-Ti3C2Tx/MoS3 also exhibits satisfying lithium storage performance. Kinetics analysis and theoretical calculation further explain the outstanding performance of LF/O-Ti3C2Tx/MoS3. Moreover, LF/O-Ti3C2Tx modified CuS/SnS2 composites also show similar and excellent electrochemical results for SIBs and LIBs. This facile synthesis strategy opens a door to prepare high-performance Ti3C2Tx supported conversion-type anode materials for large-scale energy storage.

Automated summary

Three kinds of Ti3C2Tx modified metal sulfide composites were prepared using a universal one-step strategy. Among them, LF/O-Ti3C2Tx/MoS3 exhibited outstanding cycling performance with a reversible capacity of 611 mA h g(-1) in sodium-ion batteries.