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Electrolytic Graphene Encapsulated CeO2 for Lithium-Sulfur Battery Interlayer Separator.

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Rare earth oxide and graphene composites effectively block polysulfide shuttling in energy storage cells. This improves battery cycling stability and performance, showcasing advanced materials for energy applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rare earth elements and graphene composites offer enhanced catalytic properties for energy storage.
  • The polysulfide shuttle effect in lithium-sulfur batteries hinders performance and cycle life.
  • Functional layers in separators can mitigate the shuttle effect.

Purpose of the Study:

  • To prepare and evaluate cerium oxide/graphene composites (CeG) as a functional layer in battery separators.
  • To investigate the effectiveness of CeG in suppressing the polysulfide shuttle effect.
  • To assess the impact of CeG on the electrochemical performance and stability of energy storage cells.

Main Methods:

  • Simultaneous intercalation exfoliation and in situ electrodeposition were used to synthesize CeO2/graphene composites.
  • The structural properties of the CeG composite, including defect levels (ID/IG < 1), were characterized.
  • Electrochemical performance was tested using separator cells with the CeG functional layer.

Main Results:

  • The CeG composite exhibited a superior physical structure with low defect levels, effectively shielding polysulfides.
  • The separator cell with CeG achieved a high initial discharge specific capacity of 1133.5 mAh/g at 0.5C.
  • Excellent rate performance (978.5 mAh/g at 2C) and long cycling stability (790 mAh/g after 400 cycles) were demonstrated.

Conclusions:

  • CeO2/graphene composites are effective in suppressing the polysulfide shuttle effect in energy storage devices.
  • The unique structure of CeG enhances the cycling stability and rate capability of battery cells.
  • This study highlights the potential of rare earth oxide-graphene composites for advanced energy storage materials.