Preventing the Dissolution of Lithium Polysulfides in Lithium–Sulfur Cells by using Nafion-coated Cathodes

Soo Jung Oh, Jun Kyu Lee, Wooyoung Yoon

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The principal drawback of lithium–sulfur batteries is the dissolution of long-chain lithium polysulfides into the electrolyte, which limits cycling performance. To overcome this problem, we focused on the development of a novel cathode as well as anode material and designed Nafion-coated NiCrAl/S as a cathode and lithium powder as an anode. Nafion-coated NiCrAl/S cathode was synthesized using a two-step dip-coating technique. The lithium-powder anode was used instead of a lithium-foil anode to prohibit dendrite growth and to improve on the electrochemical behaviors. The cells showed an initial discharge capacity of about 900 mA g−1 and a final discharge capacity of 772 mA g−1 after 100 cycles at 0.1 C-rate. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) demonstrate that using the Nafion-coated NiCrAl/S cathode can suppress the dissolution of long-chain lithium polysulfides.

Original languageEnglish
Pages (from-to)2562-2566
Number of pages5
JournalChemSusChem
Volume7
Issue number9
DOIs
Publication statusPublished - 2014

Keywords

  • batteries
  • cathodes
  • electrochemistry
  • electrolytes
  • polymers

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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