A Laser-Induced Mo 2 CT x MXene Hybrid Anode for High-Performance Li-Ion Batteries.

MXenes, a fast-growing family of two-dimensional (2D) transition metal carbides/nitrides, are promising for electronics and energy storage applications. Mo CT MXene, in particular, has demonstrated a higher capacity than other MXenes as an anode for Li-ion batteries. Yet, such enhanced capacity is accompanied by slow kinetics and poor cycling stability. Herein, it is revealed that the unstable cycling performance of Mo CT is attributed to the partial oxidation into MoO with structural degradation. A laser-induced Mo CT /Mo C (LS-Mo CT ) hybrid anode has been developed, of which the Mo C nanodots boost redox kinetics, and the laser-reduced oxygen content prevents the structural degradation caused by oxidation. Meanwhile, the strong connections between the laser-induced Mo C nanodots and Mo CT nanosheets enhance conductivity and stabilize the structure during charge-discharge cycling. The as-prepared LS-Mo CT anode exhibits an enhanced capacity of 340 mAh g vs 83 mAh g (for pristine) and an improved cycling stability (capacity retention of 106.2% vs 80.6% for pristine) over 1000 cycles. The laser-induced synthesis approach underlines the potential of MXene-based hybrid materials for high-performance energy storage applications.