Volume 134, Issue 7 e202114671
Forschungsartikel

Surface Gelation on Disulfide Electrocatalysts in Lithium–Sulfur Batteries

Xi-Yao Li

Xi-Yao Li

Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

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Dr. Shuai Feng

Dr. Shuai Feng

College of Chemistry and Chemical Engineering, Taishan University, Shandong, 271021 P.R. China

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Meng Zhao

Meng Zhao

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 P.R. China

Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081 P.R. China

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Chang-Xin Zhao

Chang-Xin Zhao

Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

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Dr. Xiang Chen

Dr. Xiang Chen

Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

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Dr. Bo-Quan Li

Corresponding Author

Dr. Bo-Quan Li

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 P.R. China

Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081 P.R. China

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Prof. Jia-Qi Huang

Prof. Jia-Qi Huang

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 P.R. China

Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081 P.R. China

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Prof. Qiang Zhang

Corresponding Author

Prof. Qiang Zhang

Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

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First published: 10 December 2021
Citations: 1

Abstract

Lithium–sulfur (Li–S) batteries are deemed as future energy storage devices due to ultrahigh theoretical energy density. Cathodic polysulfide electrocatalysts have been widely investigated to promote sluggish sulfur redox kinetics. Probing the surface structure of electrocatalysts is vital to understanding the mechanism of polysulfide electrocatalysis. In this work, we for the first time identify surface gelation on disulfide electrocatalysts. Concretely, the Lewis acid sites on disulfides trigger the ring-opening polymerization of the dioxolane solvent to generate a surface gel layer, covering disulfides and reducing the electrocatalytic activity. Accordingly, a Lewis base triethylamine (TEA) is introduced as a competitive inhibitor. Consequently, Li–S batteries with disulfide electrocatalysts and TEA afford high specific capacity and improved rate responses. This work affords new insights on the actual surface structure of electrocatalysts in Li–S batteries.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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