Li2S nano spheres anchored to single-layered graphene as a high-performance cathode material for lithium/sulfur cells

Dan Sun, Yoon Hwa, Yue Shen, Yunhui Huang, Elton J. Cairns

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Fully lithiated lithium sulfide (Li2S) has become a promising cathode material for Li/S cells due to its high theoretic capacity (1166 mA h g-1) and specific energy (2600 W h kg-1). However, low utilization of sulfur and poor rate capability still hinder the practical application of Li/S cells. In this paper, a carbon coated Li2S/graphene composite (Li2S/G@C) was developed by incorporating Li2S nano spheres with single-layered graphene and further forming a durable protective carbon layer on the surface of the Li2S particles using a facile CVD method. The high rate capability and remarkable cycle life of the Li2S/G@C cathode were demonstrated, which was mainly attributed to the unique structure of the Li2S/G@C that can significantly improve not only the electrical conductivity, but also the mechanical stability of the sulfur cathode.

Original languageEnglish (US)
Pages (from-to)524-532
Number of pages9
JournalNano Energy
Volume26
DOIs
StatePublished - Aug 1 2016

Keywords

  • Carbon coating
  • Energy storage
  • Graphene
  • Lithium batteries
  • Lithium sulfide
  • Sulfur

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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