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

Zhenhua Liao; Qingwei Li; Jiabao Zhang; Juan Xu; Biao Gao; Paul K. Chu; Kaifu Huo

Index: 10.1002/celc.201800092

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Abstract

MoS2 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 MoS2 nanoflakes grown on N‐doped carbon nanosheets (MoS2/NC) are investigated as high‐performance anodes in LIBs. The materials are prepared by annealing dodecylamine‐intercalated MoO3 nanosheets under Ar at 400 °C, followed by a hydrothermal treatment in the thiourea (CH4N2S) solution at 220 °C for 30 h. In the MoS2/NC structure, the NC nanosheets constitute a long‐range conductive network for fast electron transfer, whereas the oriented MoS2 nanoflakes provide sufficient active sites for Li+ storage and fast Li+ diffusion along the a–b plane. Consequently, the MoS2/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 MoS2/NC anodes and the process can be extended to other metal dichalcogenides for future high‐performance LIBs.