Electrochemical properties of sulfur–carbon hollow nanospheres with varied polar titanium oxide layer location for lithium–sulfur batteries

Gi Dae Park, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

Abstract

Porous and graphitic carbon materials containing high amounts of sulfur are being actively studied for Li–S batteries on account of their diverse structural merits. However, the lithium polysulfides dissolution in the electrolyte during cycling is one of the obstacles in the practical application of Li–S batteries. Some strategies have been suggested to address this issue, including the physical confinement of nonporous structures or the use of polar materials. In addition, forming a polar coating layer over a sulfur-embedded carbon matrix is considered as a highly effective strategy. However, the arrangement of elemental sulfur, the porous carbon matrix, and polar materials in the composite cathode should be further optimized to minimize polysulfide dissolution during cycling. Here, ultrafine TiOx nanodots are uniformly deposited over active sulfur embedded within hollow porous carbon nanospheres by a simple and rapid impregnation process. Depending on the infiltration order of the TiOx precursor solution, different arrangements of ultrafine TiOx nanodots are formed in the carbon shell. The polar TiOx nanodots arranged in the outermost layer of HPCS-S efficiently block the diffusion of soluble polysulfides, which result in excellent cycle performance. The discharge capacity of the polar TiOx layer-coated sulfur-embedded hollow carbon nanospheres for the 500th cycle at 1.0 C (1675 mA g−1) is 630 mA h g−1, and the specific capacity at 5.0 C is 513 mA h g−1.

Original languageEnglish
Pages (from-to)9071-9079
Number of pages9
JournalInternational Journal of Energy Research
Volume46
Issue number7
DOIs
Publication statusPublished - 2022 Jun 10

Keywords

  • Li–S batteries
  • lithium polysulfide
  • polar material
  • porous and hollow carbon
  • titanium oxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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