Ultrathin sandwich-like MoS2@N-doped carbon nanosheets for anodes of lithium ion batteries

Jae Min Jeong, Kyoung G. Lee, Sung Jin Chang, Jung Won Kim, Young Kyu Han, Seok Jae Lee, Bong Gill Choi

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

In this work, we report on a simple and scalable process to synthesize the core-shell nanostructure of MoS2@N-doped carbon nanosheets (MoS2@C), in which polydopamine is coated on the MoS2 surface and is then carbonized. An intensive investigation using transmission electron microscopy and Raman spectroscopy reveals that the as-synthesized MoS2@C possesses a nanoscopic and ultrathin layer of MoS2 sheets with a thin and conformal coating of carbon layers (∼3 nm). The MoS2@C demonstrates a superior electrochemical performances as an anode material for lithium ion batteries compared to exfoliated MoS2 and bulk MoS2 samples. This unique core-shell structure is capable of delivering an excellent Li+ ion charging-discharging process as follows: a specific capacity as high as 1239 mA h g-1, a high rate capability even at a high current rate of 10 A g-1 while retaining 597 mA h g-1, and a good cycle stability over 200 cycles at a high current rate of 2 A g-1.

Original languageEnglish
Pages (from-to)324-329
Number of pages6
JournalNanoscale
Volume7
Issue number1
DOIs
StatePublished - 7 Jan 2015

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