Oriented MoS2 Nanoflakes on N-Doped Carbon Nanosheets Derived from Dodecylamine-Intercalated MoO3 for High-Performance Lithium-Ion Battery Anodes

Graphical Stand up straight : Vertically oriented MoS 2 nanoflakes on N-doped carbon nanosheets (MoS 2 /NC) are produced, which serve as the large-capacity, high-rate, and long-life anodes for lithium-ion batteries. The MoS 2 /NC electrode shows excellent cycling stability with a reversible capacity of 722 mAh g −1 at 100 mA g −1 after 100 cycles as well as a rate performance of 554 mAh g −1 at 2000 mA g −1 . MoS 2 is a promising anode material for lithium-ion batteries (LIBs) because of its layered structure, analogous to that of graphite, and high lithium storage capacity of 670 mAh g −1 . However, its practical implementation in LIBs is hindered by poor conductivity, large volume change, and possible polysulfide shuttling during cycling. In this work, oriented MoS 2 nanoflakes grown on N-doped carbon nanosheets (MoS 2 /NC) are investigated as high-performance anodes in LIBs. The materials are prepared by annealing dodecylamine-intercalated MoO 3 nanosheets under Ar at 400 °C, followed by a hydrothermal treatment in the thiourea (CH 4 N 2 S) solution at 220 °C for 30 h. In the MoS 2 /NC structure, the NC nanosheets constitute a long-range conductive network for fast electron transfer, whereas the oriented MoS 2 nanoflakes provide sufficient active sites for Li + storage and fast Li + diffusion along the a – b plane. Consequently, the MoS 2 /NC electrode shows a remarkable capacity of 803 mAh g −1 at a current density of 100 mA g −1 , a high rate capability of 554 mAh g −1 at 2000 mA g −1 , and excellent cycle stability. Our results reveal a facile and general method to produce high-performance heterostructured MoS 2 /NC anodes and the process can be extended to other metal dichalcogenides for future high-performance LIBs.