Reversible electrochemical oxidation of sulfur in ionic liquid for high-voltage Al−S batteries

Huan Li, Rongwei Meng, Yong Guo, Biao Chen, Yan Jiao, Chao Ye, Yu Long, Anton Tadich, Quan-Hong Yang, Mietek Jaroniec and Shi-Zhang Qiao ()
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Huan Li: The University of Adelaide
Rongwei Meng: Tianjin University
Yong Guo: Tianjin University
Biao Chen: Tianjin University
Yan Jiao: The University of Adelaide
Chao Ye: The University of Adelaide
Yu Long: Tianjin University
Anton Tadich: Australian Synchrotron (ANSTO)
Quan-Hong Yang: Tianjin University
Mietek Jaroniec: Kent State University
Shi-Zhang Qiao: The University of Adelaide

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Sulfur is an important electrode material in metal−sulfur batteries. It is usually coupled with metal anodes and undergoes electrochemical reduction to form metal sulfides. Herein, we demonstrate, for the first time, the reversible sulfur oxidation process in AlCl3/carbamide ionic liquid, where sulfur is electrochemically oxidized by AlCl4− to form AlSCl7. The sulfur oxidation is: 1) highly reversible with an efficiency of ~94%; and 2) workable within a wide range of high potentials. As a result, the Al−S battery based on sulfur oxidation can be cycled steadily around ~1.8 V, which is the highest operation voltage in Al−S batteries. The study of sulfur oxidation process benefits the understanding of sulfur chemistry and provides a valuable inspiration for the design of other high-voltage metal−sulfur batteries, not limited to Al−S configurations.

Date: 2021
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DOI: 10.1038/s41467-021-26056-7

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