Polymer Electrolyte/Sulfur Double-Shelled Anisotropic Reduced Graphene Oxide Lamellar Scaffold Enables Stable and High-Loading Cathode for Quasi-Solid-State Lithium-Sulfur Batteries

Hyun Jung Shin, Sung Woo Park, Sangbaek Park, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Lithium-sulfur batteries (LSBs) can replace lithium-ion batteries by delivering a higher specific capacity. However, the areal capacity of current LSBs is low because the intrinsic limitations of sulfur make achieving a high sulfur loading difficult. Herein, the authors report vertically aligned reduced graphene oxide (rGO) with sulfur and poly(ethylene oxide)-based polymer electrolyte double-shell layers (VRG@S@PPE) as a high-loading sulfur cathode. The addition of vapor-grown carbon fiber (VGCF) into rGO is the key to success, as it allows for gas evacuation from internal nano/micropores without structural collapse, enabling perfect double-shell layer contact. Owing to the anisotropic rGO lamellar structure that enables straightforward ion/electron transport and provides numerous active sites, sulfur-infiltrated rGO reinforced via VGCF (VRG@S) exhibits a high capacity of 998 mAh g−1 after 100 cycles at 0.1 C under high sulfur loading (6 mg cm−2). Interestingly, an additional polymer electrolyte layer further increases the cycle retention (1005 and 718 mAh g−1 after 100 cycles at 0.1 and 1 C, respectively), because intimate contact between the solid polymer electrolyte and sulfur could suppress the loss of sulfur due to lithium polysulfide (LPS) shuttling or volume change during lithiation/delithiation. Therefore, it is possible to realize safe and stable quasi-solid-state LSBs with high sulfur loading.

Original languageEnglish
Article number2205424
JournalAdvanced Science
Volume10
Issue number6
DOIs
Publication statusPublished - 2023 Feb 24

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Advanced Science published by Wiley-VCH GmbH.

Keywords

  • 3D reduced graphene oxide arrays
  • free-standing electrodes
  • gel-polymer electrolytes
  • high areal mass loading
  • quasi-solid-state lithium-sulfur batteries

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • General Chemical Engineering
  • General Materials Science
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • General Engineering
  • General Physics and Astronomy

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