Elemental Sulfur and Molybdenum Disulfide Composites for Li-S Batteries with Long Cycle Life and High-Rate Capability

Philip T. Dirlam, Jungjin Park, Adam G. Simmonds, Kenneth Domanik, Clay B. Arrington, Jennifer L. Schaefer, Vladimir P. Oleshko, Tristan S. Kleine, Kookheon Char, Richard S Glass, Christopher L. Soles, Chunjoong Kim, Nicola Pinna, Yung Eun Sung, Dong-Chul Pyun

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

The practical implementation of Li-S technology has been hindered by short cycle life and poor rate capability owing to deleterious effects resulting from the varied solubilities of different Li polysulfide redox products. Here, we report the preparation and utilization of composites with a sulfur-rich matrix and molybdenum disulfide (MoS2) particulate inclusions as Li-S cathode materials with the capability to mitigate the dissolution of the Li polysulfide redox products via the MoS2 inclusions acting as "polysulfide anchors". In situ composite formation was completed via a facile, one-pot method with commercially available starting materials. The composites were afforded by first dispersing MoS2 directly in liquid elemental sulfur (S8) with sequential polymerization of the sulfur phase via thermal ring opening polymerization or copolymerization via inverse vulcanization. For the practical utility of this system to be highlighted, it was demonstrated that the composite formation methodology was amenable to larger scale processes with composites easily prepared in 100 g batches. Cathodes fabricated with the high sulfur content composites as the active material afforded Li-S cells that exhibited extended cycle lifetimes of up to 1000 cycles with low capacity decay (0.07% per cycle) and demonstrated exceptional rate capability with the delivery of reversible capacity up to 500 mAh/g at 5 C.

Original languageEnglish (US)
Pages (from-to)13437-13448
Number of pages12
JournalACS Applied Materials and Interfaces
Volume8
Issue number21
DOIs
Publication statusPublished - Jun 1 2016

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Keywords

  • elemental sulfur
  • high-rate
  • inverse vulcanization
  • Li-S
  • lithium-sulfur
  • molybdenum disulfide
  • MoS
  • rechargeable battery

ASJC Scopus subject areas

  • Materials Science(all)

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