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Achieving High-Performance Li-S Batteries via Polysulfide Adjoining Interface Engineering.

Hun Kim1, Sangin Bang1, Kyeong-Jun Min1

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

ACS Applied Materials & Interfaces
|August 11, 2021
PubMed
Summary

Researchers developed high-energy-density lithium-sulfur (Li-S) batteries by creating a 3D sulfur cathode and modifying the electrolyte. This approach prevents overcharging and improves Li-S battery performance under lean electrolyte conditions.

Keywords:
Li metal protectiondiluenthigh energy densityhigh loadinglean electrolytelithium−sulfur batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High energy density is crucial for lithium-sulfur (Li-S) batteries.
  • Challenges include maximizing sulfur cathode loading and minimizing electrolyte while managing lithium polysulfide (LiPS) issues.

Purpose of the Study:

  • To achieve high energy density in Li-S batteries.
  • To address overcharging and LiPS limitations in high-loading, lean electrolyte systems.

Main Methods:

  • Fabrication of a high-loading sulfur cathode with a 3D network structure via pelletizing.
  • Pretreatment of lithium metal anode to prevent overcharging.
  • Addition of a diluent to the electrolyte to facilitate S species conversion.

Main Results:

  • A prototype Li-S pouch cell achieved high energy density (427 Wh kg⁻¹).
  • The strategy effectively managed LiPS and enabled stable cycling under lean electrolyte conditions.
  • Combined 3D cathode, pretreated anode, and modified electrolyte proved successful.

Conclusions:

  • The developed strategies provide a guideline for high energy density Li-S battery development.
  • This approach overcomes key limitations in high-loading, lean electrolyte Li-S cells.
  • Successful realization of a high-performance Li-S battery prototype.