Enhanced reversible Li-ion storage in Si@Ti3C2 MXene nanocomposite

The Si@Ti 3 C 2 MXene nanocomposite was prepared in this paper by simply ultrasonic mixing of commercially available nanosized Si and Ti 3 C 2 MXene. The introduction of Ti 3 C 2 makes the aggregation of silicon nanoparticles relieved. Electrochemical measurements show that the nanocomposite maintains a reversible capacity of 188 mAh·g −1 at 0.2 A·g −1 after 150 cycles and exhibits improved capacity retention, which are significantly better than those of pure Si. The enhanced cycling stability and rate capability are attributed to the good electrical connection between silicon and Ti 3 C 2 . This study provides a new available matrix and guidance for the applications of MXenes in Si-based anode LIBs.