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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Constructing the Interconnected Charge Transfer Pathways in Sulfur Composite Cathode for All-Solid-State

Ha-Neul Choi1, Hun Kim1, Min-Jae Kim1

  • 1Department of Energy Engineering, Hanyang University, Seoul 04763, Republic of Korea.

ACS Applied Materials & Interfaces
|February 20, 2024
PubMed
Summary

Researchers developed a novel flower-shaped MoS2/sulfur composite for all-solid-state lithium-sulfur batteries (ASSLSBs). This design enhances conductivity and enables stable battery operation over 1000 cycles with near 100% Coulombic efficiency.

Keywords:
MoS2all-solid-state lithium−sulfur batterieshigh conductivityhigh sulfur utilizationsulfur host

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium-sulfur batteries (ASSLSBs) offer high energy density, low cost, and enhanced safety.
  • The insulating nature of sulfur (S) hinders its effective utilization as an active material in ASSLSBs.
  • Existing methods for incorporating MoS2 nanoparticles with sulfur face challenges like physical-electrochemical isolation.

Purpose of the Study:

  • To design a novel MoS2/sulfur composite material for improved ionic and electrical conductivity in ASSLSBs.
  • To overcome the isolation issue of MoS2 nanoparticles within the sulfur matrix.
  • To demonstrate the performance of ASSLSBs utilizing the developed composite material.

Main Methods:

  • Fabrication of a flower-shaped composite material using MoS2 nanoparticles and sulfur.
  • Application of mild milling and melt diffusion techniques to create uniform MoS2/sulfur composites.
  • Assembly and testing of ASSLSBs with a sulfide solid electrolyte (Li6PS5Cl) and the MoS2/sulfur composite cathode.

Main Results:

  • The MoS2/sulfur composite successfully established interconnected ionic and electrical conduction pathways.
  • The composite material facilitated effective utilization of sulfur as an active material.
  • The ASSLSB demonstrated stable cycling performance for over 1000 cycles with a Coulombic efficiency close to 100%.

Conclusions:

  • The structural design of sulfur composite materials is crucial for high-performance ASSLSBs, alongside intrinsic material properties.
  • The developed MoS2/sulfur composite offers a promising solution for overcoming sulfur utilization challenges in ASSLSBs.
  • This work highlights the potential of tailored composite structures for advancing next-generation solid-state batteries.