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Despite various 2H-MoS2/carbon hybrid nanostructures have been constructed and committed to improve the performance for sodium-ion batteries (SIBs), they still show the limited cycle stability due to the relatively large volumetric expansion during the charge–discharge process. Herein, we report the construction of cobalt-doped few-layered 1T-MoS2 nanosheets embedded in N, S-doped carbon (CMS/NSC) nanobowls derived from metal-organic framework (MOF) precursor via a simple in situ sulfurization process. This unique hierarchical structure enables the uniformly dispersed Co-doped 1T-MoS2 nanosheets intimately couple with the highly conductive carbon nanobowls, thus efficiently preventing the aggregation. In particular, the Co-doping plays a crucial role in maintaining the integrity of structure for MoS2 during cycling tests, confirmed by first-principles calculations. Compared with pristine MoS2, the volume deformation of Co-doped MoS2 can be shrunk by a prominent value of 52% during cycling. Furthermore, the few-layered MoS2 nanosheets with 1T metallic phase endow higher conductivity, and thus can surpass its counterpart 2H semiconducting phase in battery performance. By virtue of the synergistic effect of stable structure, appropriate doping and high conductivity, the resulting CMS/NSC hybrid shows superior rate capability and cycle stability. The capacity of CMS/NSC can still be 235.9 mAh·g-1 even at 25 A·g-1, which is 51.3% of the capacity at 0.2 A·g-1. Moreover, the capacity can still remain 218.6 mAh·g-1 even over 8, 240 cycles at 5 A·g-1 with a low decay of 0.0044% per cycle, one of the best performances among the reported MoS2-based anode materials for SIBs.


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Co-doped 1T-MoS2 nanosheets embedded in N, S-doped carbon nanobowls for high-rate and ultra-stable sodium-ion batteries

Show Author's information Peihao Li1,§Yong Yang1,§Sheng Gong2Fan Lv1Wei Wang1Yiju Li1Mingchuan Luo1Yi Xing1Qian Wang1,3Shaojun Guo1,4( )
Department of Materials Science & EngineeringCollege of EngineeringPeking UniversityBeijing100871China
Department of Materials Science and EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
Center for Applied Physics and TechnologyCollege of EngineeringPeking UniversityBeijing100871China
BIC-ESATCollege of EngineeringPeking UniversityBeijing100871China

§ Peihao Li and Yong Yang contributed equally to this work.

Abstract

Despite various 2H-MoS2/carbon hybrid nanostructures have been constructed and committed to improve the performance for sodium-ion batteries (SIBs), they still show the limited cycle stability due to the relatively large volumetric expansion during the charge–discharge process. Herein, we report the construction of cobalt-doped few-layered 1T-MoS2 nanosheets embedded in N, S-doped carbon (CMS/NSC) nanobowls derived from metal-organic framework (MOF) precursor via a simple in situ sulfurization process. This unique hierarchical structure enables the uniformly dispersed Co-doped 1T-MoS2 nanosheets intimately couple with the highly conductive carbon nanobowls, thus efficiently preventing the aggregation. In particular, the Co-doping plays a crucial role in maintaining the integrity of structure for MoS2 during cycling tests, confirmed by first-principles calculations. Compared with pristine MoS2, the volume deformation of Co-doped MoS2 can be shrunk by a prominent value of 52% during cycling. Furthermore, the few-layered MoS2 nanosheets with 1T metallic phase endow higher conductivity, and thus can surpass its counterpart 2H semiconducting phase in battery performance. By virtue of the synergistic effect of stable structure, appropriate doping and high conductivity, the resulting CMS/NSC hybrid shows superior rate capability and cycle stability. The capacity of CMS/NSC can still be 235.9 mAh·g-1 even at 25 A·g-1, which is 51.3% of the capacity at 0.2 A·g-1. Moreover, the capacity can still remain 218.6 mAh·g-1 even over 8, 240 cycles at 5 A·g-1 with a low decay of 0.0044% per cycle, one of the best performances among the reported MoS2-based anode materials for SIBs.

Keywords: anode, metal-organic framework (MOF), sodium-ion battery, 1T-MoS2, cobalt-doping

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Acknowledgements

Publication history

Received: 13 September 2018
Revised: 28 October 2018
Accepted: 20 November 2018
Published: 15 December 2018
Issue date: September 2019

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Acknowledgements

Acknowledgements

This work was financially supported by National Key R & D Program of China (No. 2016YFB0100200), Young Thousand Talents Program, the Open Project Foundation of State Key Laboratory of Chemical Resource Engineering, the China Postdoctoral Science Foundation (No.2017M610018), the National Natural Science Foundation of China (No. 51671003), Start-up Funding from Peking University.

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