Preparation of graphene hollow spheres from vacuum residue of ultra-heavy oil as an effective oxygen electrode for Li-O2 batteries

K. H. Lim, S. Kim, H. Kweon, S. Moon, C. H. Lee, H. Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A three-dimensional graphene hollow sphere is prepared via a green synthetic method by utilizing vacuum residue (VR) and is shown to function as an oxygen electrode material for Li-O2 batteries. It is noteworthy that VR, which is considered an environmental pollutant and is used primarily in asphalt-paved roads, can be utilized effectively as a novel precursor for carbon electrodes in Li-O2 batteries. The low-valued VR is converted into graphene hollow sphere carbon by using Fe3O4, which serves as both a catalyst and a template in m-xylene under supercritical conditions. Since the hollow sphere structure is associated with a multi-layer graphene feature, it provides adequate void space for storing the discharge product of Li2O2 and suppresses the formation of Li2CO3. This results in capacities reaching 16805 mA h gcarbon-1, which is higher than that of commercial KB600J carbon (5493 mA h gcarbon-1), and in improved cycle performance.

Original languageEnglish
Pages (from-to)4040-4047
Number of pages8
JournalJournal of Materials Chemistry A
Volume6
Issue number9
DOIs
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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