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Surface engineering of core-shell MoS

Guangsheng Dong1, Huiying Yu1, Lixin Li1

  • 1Key Laboratory of Superlight Materials and Surface Technology (Ministry of Education), College Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, People's Republic of China.

Journal of Colloid and Interface Science
|June 3, 2023
PubMed
Summary
This summary is machine-generated.

Molybdenum disulfide (MoS2) anodes for sodium-ion batteries (SIBs) show improved stability using a nitrogen-doped carbon (NC) shell. This core-shell structure enhances cycling ability and rate performance for next-generation energy storage.

Keywords:
Core–shell structureMoS(2) micro-/nanospheresNitrogen-doped carbonSodium-ion batteriesUltra-high cycling stability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Molybdenum disulfide (MoS2) is a promising anode material for sodium-ion batteries (SIBs) due to its high capacity, low cost, and abundant resources.
  • Practical application of MoS2 in SIBs is limited by poor cycling stability caused by mechanical stress and unstable solid electrolyte interphase (SEI) during cycling.

Purpose of the Study:

  • To design and synthesize a novel core-shell composite, MoS2@NC, to enhance the cycling stability of MoS2 anodes in SIBs.
  • To investigate the structural evolution and electrochemical performance of the MoS2@NC composite for SIB applications.

Main Methods:

  • Synthesis of spherical MoS2@polydopamine derived N-doped carbon (NC) shell composites (MoS2@NC).
  • Characterization of the structural and morphological changes of MoS2 within the NC shell during electrochemical cycling.
  • Electrochemical testing of MoS2@NC as an anode in SIBs, including cycling stability and rate performance evaluations.
  • Assembly and testing of a MoS2@NC‖Na3V2(PO4)3 full-cell.

Main Results:

  • The MoS2 core restructured into ultra-fine nanosheets, improving material utilization and ion transport.
  • The flexible NC shell maintained structural integrity, prevented agglomeration, and facilitated stable SEI formation.
  • The MoS2@NC electrode demonstrated remarkable cyclic stability, retaining 428 mAh g-1 after 10,000 cycles at 20 A g-1.
  • A full-cell using MoS2@NC achieved 91.4% capacity retention after 250 cycles at 0.4 A g-1.

Conclusions:

  • The core-shell MoS2@NC structure significantly enhances the cycling stability and rate performance of MoS2 anodes for SIBs.
  • This work highlights the potential of MoS2-based materials for SIB anodes and offers insights into designing conversion-type electrode materials.