Oxygen-Plasma-Treated Fe-N-C Catalysts with Dual Binding Sites for Enhanced Electrocatalytic Polysulfide Conversion in Lithium-Sulfur Batteries

Euiyeon Jung, Seong Jun Kim, Jiheon Kim, Sojung Koo, Jaewoo Lee, Shin Yeong Kim, Vinod K. Paidi, Wonjae Ko, Junseok Moon, Kug Seung Lee, Sung Pyo Cho, Duho Kim, Seung Ho Yu, Yung Eun Sung, Taeghwan Hyeon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Enhanced polysulfide conversion kinetics is essential for realizing lithium-sulfur batteries with high energy density and rate performance and promising cyclability. The modification of the local atomic structure of MNxactive sites in single-atom M-N-C catalysts was proposed to improve their electrocatalytic activity for demanding reactions by fine-tuning the interaction with reaction intermediates. Here, we demonstrate that engineering the binding geometry of lithium polysulfides (LiPSs) by introducing dual binding sites improves the LiPS conversion kinetics. We use mild oxygen plasma treatment to introduce oxygen species into the Fe-N-C catalyst. The plasma-treated Fe-N-C (pFeNG) catalyst with dual sulfiphilic (mononuclear iron) and lithiophilic (oxygen) binding sites has a lower polysulfide decomposition energy, especially for Li2S redox, which is known to be the most sluggish process. The pFeNG cathode shows significant improvement, especially at high C rates (916.3 mA h g-1at 5C), with promising cycling performance.

Original languageEnglish
Pages (from-to)2646-2653
Number of pages8
JournalACS Energy Letters
Volume7
Issue number8
DOIs
Publication statusPublished - 2022 Aug 12

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Oxygen-Plasma-Treated Fe-N-C Catalysts with Dual Binding Sites for Enhanced Electrocatalytic Polysulfide Conversion in Lithium-Sulfur Batteries'. Together they form a unique fingerprint.

Cite this