Interconnected Microporous and Mesoporous Carbon Derived from Pitch for Lithium-Sulfur Batteries

Yu Chien Ko, Chun Hsiang Hsu, Chang An Lo, Chun Ming Wu, Hung Ling Yu, Chun Han Hsu, Hong Ping Lin, Chung Yuan Mou, Heng Liang Wu

Research output: Contribution to journalArticlepeer-review

Abstract

Lithium-sulfur (Li-S) batteries receive great attention due to their high theoretical energy density and low cost. However, the sulfur-carbon cathode suffers from the polysulfide dissolution during cycling, and the severe shuttle effect limits the practical application of Li-S batteries. In this work, a carbon material (XU76 carbon) derived from industry-residual petroleum was synthesized with a simple and low-cost method. Nitrogen adsorption, small-angle neutron scattering (SANS), adsorption kinetics, and UV-vis spectroscopy results show that the interconnected micromesopores in XU76 could act as a reservoir and trap polysulfide intermediates efficiently. The XU76 carbon with high surface area (∼1005 m2g-1), good electric conductivity, good ion transport, and optimized distribution of interconnected micromesopores is used as the sulfur host for trapping polysulfide intermediates and advancing sulfur redox kinetics. The Li-S battery with the sulfur-XU76 carbon cathode gives an initial discharge capacity of ∼1200 mAh g-1in the initial cycle and reversible capacity of ∼700 mAh g-1after 100 cycles at a C rate of 0.1 C while the Li-S battery with the sulfur-KB carbon cathode only delivers a discharge capacity of 400 mAh g-1after 100 cycles. Also, a discharge capacity of 462 mAh g-1is obtained after 200 cycles at a high C rate (1 C). The detailed reaction mechanism of sulfur-carbon cathodes is systematically studied at high C rates using operando Raman and S K-edge X-ray absorption spectroscopy.

Original languageEnglish
Pages (from-to)4462-4472
Number of pages11
JournalACS Sustainable Chemistry and Engineering
Volume10
Issue number14
DOIs
Publication statusPublished - Apr 11 2022
Externally publishedYes

Keywords

  • Lithium-sulfur battery
  • Mesoporous and microporous carbon
  • Operando Raman spectroscopy
  • Petroleum pitch
  • Sulfur redox kinetics

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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