Giant-miscanthus-derived activated carbon and its application to lithium sulfur batteries

Geon Hae Lim, Ji Su Chae, Young Lok Cha, Yun Chan Kang, Kwang Chul Roh

Research output: Contribution to journalArticle

Abstract

Giant miscanthus (GM) is an Asian grass that can produce biomass in high yields per land area. It can be used as a cathode material in lithium sulfur (Li/S) batteries. Giant-miscanthus-derived activated carbon (GMAC) is prepared via carbonization of GM followed by KOH activation. It is prepared with a large amount of KOH, and thus contained more defects but had a highly porous structure and graphitic cluster lattice. GMAC has a large specific surface area of 3327 m2/g and a large total pore volume of 1.86 cm3/g. The pore volume served as a storage space for the retention of polysulfides, thereby inhibiting the shuttle effect. When a GMAC–sulfur composite cathode is tested in a Li/S battery, an initial discharge capacity of 1148 mAh/g can be attained at 0.1 C. In a cyclic charge–discharge experiment at 1 C, discharge capacities of 529 mAh/g and 248 mAh/g are observed in the first and 200th cycles, respectively.

Original languageEnglish
Pages (from-to)477-484
Number of pages8
JournalCarbon Letters
Volume30
Issue number5
DOIs
Publication statusPublished - 2020 Oct 1

Keywords

  • Activated carbon
  • Biomass
  • Giant miscanthus
  • Lithium sulfur batteries

ASJC Scopus subject areas

  • Ceramics and Composites
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Process Chemistry and Technology
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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