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Cathode Engineering Enables Robust Interface Contact for High-Performance All-Sulfide-Based Li-SeS2 Solid-State

Lei Xi1, Fangkun Li1, Xuanyi Zhou1

  • 1Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.

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Summary

Selenium disulfide (SeS2) enhances all-solid-state lithium-sulfur batteries by improving conductivity. SeS2 composite cathodes achieve high capacity and stability, showing promise for next-generation energy storage.

Keywords:
all-solid-state batteriescomposite strategiesinterfacial contactselenium sulfidesulfide solid electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium-sulfur batteries offer high energy density and improved safety over liquid-based systems.
  • Sulfur's insulating nature and low reactivity limit cathode performance in these batteries.
  • Addressing sluggish kinetics and low utilization is crucial for advancing battery technology.

Purpose of the Study:

  • To investigate selenium disulfide (SeS2) as a cathode active material for all-solid-state lithium-sulfur batteries.
  • To enhance electronic conductivity and electrochemical performance compared to pure sulfur.
  • To evaluate the potential of SeS2 composites for high-energy-density applications.

Main Methods:

  • Fabrication of SeS2 composite cathodes using various strategies, including ball-milling with Li6PS5Cl and Ketjen Black (SeS2-BM@KB).
  • Electrochemical characterization of battery cells, including cycling performance and capacity retention.
  • Assessment of high-loading cells for areal capacity.

Main Results:

  • The ball-milled SeS2/Li6PS5Cl/Ketjen Black composite cathode demonstrated excellent electrochemical performance.
  • Cells achieved a reversible capacity of 673.5 mAh g-1 after 300 cycles at 1 A g-1 with 80% retention.
  • High loading cells reached an impressive areal capacity of up to 14.43 mAh cm-2.

Conclusions:

  • Selenium disulfide (SeS2) is a promising cathode material for all-solid-state lithium-sulfur batteries.
  • Enhanced interaction at the three-phase interface in SeS2 composites improves performance.
  • The developed SeS2 cathodes show potential for high-energy-density next-generation energy storage systems.