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 language | English |
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Pages (from-to) | 324-329 |
Number of pages | 6 |
Journal | Nanoscale |
Volume | 7 |
Issue number | 1 |
DOIs | |
State | Published - 7 Jan 2015 |