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Oriented MoS 2 Nanoflakes on N‐Doped Carbon Nanosheets Derived from Dodecylamine‐Intercalated MoO 3 for High‐Performance Lithium‐Ion Battery Anodes
Author(s) -
Liao Zhenhua,
Li Qingwei,
Zhang Jiabao,
Xu Juan,
Gao Biao,
Chu Paul K.,
Huo Kaifu
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800092
Subject(s) - materials science , anode , chemical engineering , polysulfide , lithium (medication) , annealing (glass) , electrode , nanotechnology , lithium ion battery , battery (electricity) , electrolyte , metallurgy , chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
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.