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Ultrathin MoS2@C layered structure as an anode of lithium ion battery

Published online by Cambridge University Press:  11 January 2016

Jae-Min Jeong
Affiliation:
Department of Chemical & Biomolecular engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Seunghwan Seok
Affiliation:
Department of Chemical & Biomolecular engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Bong Gill Choi
Affiliation:
Department of Chemical Engineering, Kangwon National University, Samcheok 245-711, Republic of Korea.
Do Hyun Kim*
Affiliation:
Department of Chemical & Biomolecular engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
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Abstract

We report 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 then carbonized. Transmission electron microscopy 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 (∼5 nm). The MoS2@C demonstrates a superior electrochemical performance as an anode material for lithium ion batteries compared to exfoliated MoS2 sample. This unique core–shell structure is capable of excellent delivery of Li+ ion in charging–discharging process: a specific capacity as high as 1239 mA h g−1, a high rate of charging-discharging 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 70 cycles at a high current rate of 2 A g−1.

Type
Articles
Copyright
Copyright © Materials Research Society 2016 

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References

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