Improved Performance through Tight Coupling of Redox Cycles of Sulfur and 2,6-Polyanthraquinone in Lithium-Sulfur Batteries

Scientific Achievement

We showed that the incorporation of an all-organic redox-active polymer 2,6-polyanthraquinone (PAQ) into the cathode improves capacity retention in galvanostatic cycling and inhibits Li corrosion and S deposition.

Redox reactions of this polymer are shown to be strongly coupled to S redox cycle.

Significance and Impact

Complex nanoengineered cathodes required to suppress the unwanted polysulfide shuttling in lithium-sulfur batteries hinder detailed understanding of their function, impeding the development of new materials.

We showed that a rationally chosen organic polymer can suppress polysulfide shuttling, and its function can be elucidated in detail.

Research Details

  • Galvanostatic cycling shows improvement in capacity retention in the presence of PAQ.
  • SEM/EDS and XPS shows significantly reduced Li corrosion and S deposition.
  • CV, EPR and IR suggest that the electrochemical reactions of PAQ form Li[PAQ] that mediates the S redox cycle.

DOI: 10.1039/C7TA08129D

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