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

The Si@Ti3C2 MXene nanocomposite was prepared in this paper by simply ultrasonic mixing of commercially available nanosized Si and Ti3C2 MXene. The introduction of Ti3C2 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 Ti3C2. This study provides a new available matrix and guidance for the applications of MXenes in Si-based anode LIBs.