Freestanding interlayers for Li-S batteries: Design and synthesis of hierarchically porous N-doped C nanofibers comprising vanadium nitride quantum dots and MOF-derived hollow N-doped C nanocages

Rakesh Saroha, Jang Hyeok Oh, Young Hoe Seon, Yun Chan Kang, Jae Seob Lee, Do Won Jeong, Jung Sang Cho

Research output: Contribution to journalArticlepeer-review

Abstract

The introduction of a functional interlayer between the cathode and anode in lithium-sulfur battery (LSB) technology results in significant improvements in electrochemical performance. Here, we developed hierarchically structured porous, conductive, and multifunctional N-doped carbon (N-C) nanofibers comprising homogeneously dispersed vanadium nitride quantum dots and hollow N-C nanocages as functional interlayers for advanced LSBs. The freestanding interlayer contains well-developed long-range channels and numerous interconnected hollow N-C nanocages derived from the metal-organic framework. Furthermore, the presence of a N-C framework and vanadium nitride quantum dots measuring several nanometers improves the redox reaction kinetics and provides numerous chemisorption sites for the effective trapping and reuse of lithium polysulfide. As a result, the assembled Li-S cell employing the unique nanostructured freestanding interlayer exhibits superior rate capability and stable cycling performance (decay rate of 0.02% per cycle at 0.5C) considering the high sulfur content (80 wt%) and loading (ca. 4 mg cm-2) in the sulfur electrodes. Even with an ultra-high sulfur loading of 11.0 mg cm-2, the Li-S cell delivered a stable areal capacity of 5.0 mA h cm-2 after 100 charge-discharge cycles at 0.05C. Thus, the uniquely nanostructured interlayer shows high potential for the development of advanced LSBs utilizing pure sulfur electrodes with realistic battery parameters. This journal is

Original languageEnglish
Pages (from-to)11651-11664
Number of pages14
JournalJournal of Materials Chemistry A
Volume9
Issue number19
DOIs
Publication statusPublished - 2021 May 21

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Freestanding interlayers for Li-S batteries: Design and synthesis of hierarchically porous N-doped C nanofibers comprising vanadium nitride quantum dots and MOF-derived hollow N-doped C nanocages'. Together they form a unique fingerprint.

Cite this