In Situ EQCM Study Examining Irreversible Changes the Sulfur-Carbon Cathode in Lithium-Sulfur Batteries

Heng Liang Wu, Laura A. Huff, Jennifer L. Esbenshade, Andrew A. Gewirth

Research output: Contribution to journalArticle

Abstract

In situ EQCM experiments were used to investigate the stability and roughness changes occurring in a sulfur-carbon cathode utilized for a Li-S battery during the charge-discharge process. Results show that the sulfur-carbon cathode gains mass during the first discharge plateau (∼2.4 V) due to the formation of the long chain polysulfides during the discharge (lithiation) process. However, further discharge to below 2.4 V yields an increase in the crystal resistance (Rc) suggesting the sulfur-carbon cathode becomes rougher. During the charge (delithiation) process, the roughness of the sulfur-carbon cathode decreases. Time dependent measurements show that the electrode surface becomes rougher with the deeper discharge, with the change occurring following a step to 1.5 V. The sulfur-carbon cathode exhibits stable Rc and frequency behavior initially, but then becomes rougher in subsequent following cycles.

Original languageEnglish (US)
Pages (from-to)20820-20828
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number37
DOIs
StatePublished - Sep 23 2015

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Keywords

  • EQCM
  • Li-S batteries
  • crystal resistance
  • polysulfide dissolution
  • roughness of the sulfur-carbon cathode

ASJC Scopus subject areas

  • Materials Science(all)

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