Microporous novolac-derived carbon beads/sulfur hybrid cathode for lithium-sulfur batteries

Research output: Contribution to journalArticleResearchpeer-review

Authors

  • Soumyadip Chourdhury
  • Benjamin Krüner
  • Pau Massuti-Ballester
  • Aura Tolosa
  • Ingrid Grobelsek
  • Lars Borchardt
  • Volker Presser

Organisational units

External Organisational units

  • INM-Leibniz Institute for New Materials
  • Saarbrücken
  • TU Dresden

Abstract

Novolac-derived nanoporous carbon beads were used as conductive matrix for lithium-sulfur battery cathodes. We employed a facile self-emulsifying synthesis to obtain sub-micrometer novolac-derived carbon beads with nanopores. After pyrolysis, the carbon beads showed already a specific surface area of 640 m2 g-1 which was increased to 2080 m2 g-1 after physical activation. The non-activated and the activated carbon beads represent nanoporous carbon with a medium and a high surface area, respectively. This allows us to assess the influence of the porosity on the electrochemical performance of lithium-sulfur battery cathodes. The carbon/sulfur hybrids were obtained from two different approaches of sulfur infiltration: melt-infusion of sulfur (annealing) and in situ formation of sulfur from sodium thiosulfate. The best performance (∼880 mAh gsulfur-1 at low charge rate; 5th cycle) and high performance stability (>600 mAh gsulfur-1 after 100 cycles) were found for the activated carbon beads when using melt infusion of sulfur.

Details

Original languageEnglish
Pages (from-to)198-208
Number of pages11
JournalJournal of power sources
Volume357.2017
Issue number31. July
DOIs
Publication statusE-pub ahead of print - 9 May 2017