Sulfur Nanogranular Film-Coated Three-Dimensional Graphene Sponge-Based High Power Lithium Sulfur Battery

Wook Ahn, Min Ho Seo, Yun Seok Jun, Dong Un Lee, Fathy M. Hassan, Xiaolei Wang, Aiping Yu, Zhongwei Chen

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

To meet the requirements of both high energy and power density with cycle durability of modern EVs, we prepared a novel nanosulfur granular assembled film coated on the three-dimensional graphene sponge (3D-GS) composite as a high-performance active material for rechargeable lithium sulfur batteries. Instead of conventional graphene powder, three-dimensional rGO sponge (3D-rGO) is employed for the composite synthesis, resulting in a sulfur film directly in contact with the underlying graphene layer. This significantly improves the overall electrical conductivity, strategically addressing challenges of conventional composites of low sulfur utilization and dissolution of polysulfides. Additionally, the synthesis mechanism of 3D-GS is elucidated by XPS and DFT analyses, where replacement of hydroxyl group of 3D-rGO sponge by sulfur (S8) is found to be thermodynamically favorable. As expected, 3D-GS demonstrates outstanding discharge capacity of 1080 mAh g-1 at a 0.1C rate, and 86.2% capacity retention even after 500 cycles at a 1.0C rate.

Original languageEnglish
Pages (from-to)1984-1991
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number3
DOIs
Publication statusPublished - Jan 27 2016
Externally publishedYes

Keywords

  • graphene sponge
  • lithium sulfur battery
  • nano sulfur granules assembled film
  • sulfur-graphene composite
  • three-dimensional graphene

ASJC Scopus subject areas

  • Materials Science(all)

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