title: Ultrathin sandwich-like MoS2@N-doped carbon nanosheets for anodes of lithium ion batteries.
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).
authors.affiliation: Center for Nanobio Integration & Convergence Engineering (NICE), National Nanofab Center, 291 Daehak-ro, Yuseong-gu, Daejeon 305-806, Republic of Korea.
authors.forename: Jae-Min
authors.initials: JM
authors.lastname: Jeong
authors.forename: Kyoung G
authors.initials: KG
authors.lastname: Lee
authors.forename: Sung-Jin
authors.initials: SJ
authors.lastname: Chang
authors.forename: Jung Won
authors.initials: JW
authors.lastname: Kim
authors.forename: Young-Kyu
authors.initials: YK
authors.lastname: Han
authors.forename: Seok Jae
authors.initials: SJ
authors.lastname: Lee
authors.forename: Bong Gill
authors.initials: BG
authors.lastname: Choi