Surfactant-Derived Nitrogen-Bridged MoS2/C Heterostructures for Robust Lithium-Ion Storage

Abstract

Structural stability, ionic transport, and electronic conductivity are the major challenges of layered transition-metal dichalcogenide/carbon nanocomposites (LTMD/C) for lithium-ion storage. Herein, to address these challenges, a quaternary ammonium surfactant-mediated strategy is proposed to simultaneously construct porous MoS 2 architectures and in situ generate nitrogen-doped carbon (NC) layers chemically coupled to MoS 2 via interfacial Mo–N bridges. The resultant N-bridged MoS 2 /C heterostructures (denoted as MoS 2 –N–C) exhibit excellent structural robustness, expanded interlayer spacing, and improved charge-transfer kinetics. As an anode in lithium-ion batteries (LIBs), the optimized MoS 2 –N–C 700 electrode delivers remarkable cycling stability (~ 100% capacity retention after 800 cycles at 0.5 A g −1 ) and excellent rate capability. Moreover, lithium-ion supercapacitors (LISCs) based on the as-prepared MoS 2 –N–C composite achieve an ultrahigh power density of 3500 W kg −1 , and excellent cycling stability over 10,000 cycles. The cycling performance in both LIBs and LISCs surpasses that of most previously reported MoS 2 /C nanocomposites and conventional carbon-based anodes. This surfactant-derived interfacial bridging structure design offers a general platform for developing robust LTMD/C heterostructured electrodes for energy storage systems.