Two Birds with One Stone: Prelithiated Two-Dimensional Nanohybrids as High-Performance Anode Materials for Lithium-Ion Batteries.

As an inexpensive and naturally abundant two-dimensional (2D) material, molybdenum disulfide (MoS 2 ) exhibits a high Li-ion storage capacity along with a low volume expansion upon lithiation, rendering it an alternative anode material for lithium-ion batteries (LIBs). However, the challenge of using MoS 2 -based anodes is their intrinsically low electrical conductivity and unsatisfied cycle stability. To address the above issues, we have exploited a wet chemical technique and integrated MoS 2 with highly conductive titanium carbide (Ti 3 C 2 ) MXene to form a 2D nanohybrid. The binary hybrids were then subjected to an n -butyllithium ( n -Buli) treatment to induce both MoS 2 deep phase transition and MXene surface functionality modulation simultaneously. We observed a substantial increase in 1T-phase MoS 2 content and a clear suppression of -F-containing functional groups in MXene due to the prelithiation process enabled by the n -Buli treatment. Such an approach not only increases the overall network conductivity but also improves Li-ion diffusion kinetics. As a result, the MoS 2 /Ti 3 C 2 composite with n -Buli treatment delivered a high Li-ion storage capacity (540 mA h g -1 at 100 mA g -1 ), outstanding cycle stability (up to 300 cycles), and excellent rate capability. This work provides an effective strategy for the structure-property engineering of 2D materials and sheds light on the rational design of high-performance LIBs using 2D-based anode materials.