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Two-Dimensional CeO2/RGO Composite-Modified Separator for Lithium/Sulfur Batteries.

Suyu Wang1, Fan Gao1, Yan Zhao2

  • 1School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.

Nanoscale Research Letters
|November 25, 2018
PubMed
Summary

A new battery separator using cerium oxide (CeO2) and reduced graphene oxide (RGO) enhances performance. This composite material effectively suppresses polysulfide shuttling, improving lithium-sulfur battery capacity and longevity.

Keywords:
CeO2/RGO compositeLithium/sulfur batteriesModified separator

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from polysulfide shuttling.
  • Effective strategies are needed to confine polysulfides and improve Li-S battery performance.

Purpose of the Study:

  • To develop a modified battery separator for enhanced lithium-sulfur batteries.
  • To investigate the role of cerium oxide (CeO2) nanoparticles and reduced graphene oxide (RGO) in suppressing polysulfide shuttling.

Main Methods:

  • A novel separator was fabricated by coating a functional layer of reduced graphene oxide (RGO) anchored with cerium oxide (CeO2) nanoparticles.
  • The electrochemical performance of the modified separator in Li-S batteries was evaluated through charge/discharge cycling.

Main Results:

  • The CeO2/RGO composite separator demonstrated superior conductivity and effective immobilization of polysulfides (Li2Sn, 4 ≤ n ≤ 8).
  • A remarkable initial capacity of 1136 mAh g⁻¹ at 0.1 C was achieved.
  • The battery exhibited a capacity retention ratio of 75.7% after 100 cycles, indicating good stability.

Conclusions:

  • The developed CeO2/RGO composite separator effectively suppresses polysulfide shuttling in lithium-sulfur batteries.
  • This advanced separator material shows significant promise for improving the overall performance and utilization of active materials in Li-S batteries.