DataVXACS Energy LettersPaper
journal article·2022-08-12

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

ACS Energy Letters· Volume 7· Issue 8
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Source abstract

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 MNx active 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–1 at 5C), with promising cycling performance.
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Research context

Energy storageCatalysis & surfaces

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea

School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea

Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea

Department of Mechanical Engineering (Integrated Engineering Program), Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, Republic of Korea

Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea

National Center for Inter-University Research Facilities, Seoul National University, Seoul 08826, Republic of Korea

Funding

National Research Foundation of Korea · Institute for Basic Science

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