Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 895, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162514
Keywords
MoS2; S-vacancies; Sodium-ion battery; N-doped carbon flower
Categories
Funding
- Shandong Provincial Natural Science Foundation [ZR2020QB127]
- Key Technology Research and Development Program of Shandong [2019JZZY020704]
- Shandong Province Higher Educational Science and Technology Program [2018LS001]
- Science and Technology Development Plan of Weifang [2021GX051]
- Doctoral Fund of Weifang University of Science and Technology [KJRC2020003]
- Special Project of Discipline Construction of Weifang University of Science and Technology [2021XKJS40]
- Research Fund Program of Key Laboratory of Fuel Cell Technology of Guangdong Province
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The article presents a novel design strategy by introducing S vacancies on MoS2 nanosheets and anchoring them on N-doped carbon framework to achieve the development and application of high-performance SIBs.
Molybdenum disulfide (MoS2) has been regarded as a promising anode material for sodium ion batteries (SIBs) due to its high theoretical capacity and graphene-like layered structure. However, the intrinsically low conductivity and large volume expansion during charge discharge cycling have become two key challenges hindering the practical application of MoS2 electrodes. Here, few-layered MoS2 nanosheets with S-vacancies are anchored on a 3D flower-like N-doped carbon frameworks (NCF@V-MoS2) by facile hydrothermal method and chemical etching strategy. The introduction of S-vacancies onto MoS2 nanosheet surface not only adjusts the electronic structure and intrinsically improves the conductivity, but also enlarges the interlayer distance and accelerates Na+ diffusion. The density functional theory calculations reveal that the existence of S-vacancies strongly accelerates Na' absorption ability. Benefiting the synergistic effect of the conductive NCF and V-MoS2, the as-synthesized NCF@V-MoS2 yields a high specific capacity with excellent rate performance and cycling stability. This novel design strategy holds great promise for the development and application of high-performance SIBs in the future. (C) 2021 Elsevier B.V. All rights reserved.
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