Volume 14, Issue 42 1802516
Full Paper

Boosting the Electrochemical Performance of Li–S Batteries with a Dual Polysulfides Confinement Strategy

Yu Yao

Yu Yao

Department of Materials Science and Engineering, University of Science and Technology of China, CAS Key Laboratory of Materials for Energy Conversion, Hefei, 230026 Anhui, China

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Wanlin Feng

Wanlin Feng

Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900 China

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Minglong Chen

Minglong Chen

Department of Materials Science and Engineering, University of Science and Technology of China, CAS Key Laboratory of Materials for Energy Conversion, Hefei, 230026 Anhui, China

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Xiongwu Zhong

Xiongwu Zhong

Department of Materials Science and Engineering, University of Science and Technology of China, CAS Key Laboratory of Materials for Energy Conversion, Hefei, 230026 Anhui, China

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Xiaojun Wu

Corresponding Author

Xiaojun Wu

Department of Materials Science and Engineering, University of Science and Technology of China, CAS Key Laboratory of Materials for Energy Conversion, Hefei, 230026 Anhui, China

E-mail: [email protected], [email protected], [email protected]Search for more papers by this author
Haibin Zhang

Corresponding Author

Haibin Zhang

Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900 China

E-mail: [email protected], [email protected], [email protected]Search for more papers by this author
Yan Yu

Corresponding Author

Yan Yu

Department of Materials Science and Engineering, University of Science and Technology of China, CAS Key Laboratory of Materials for Energy Conversion, Hefei, 230026 Anhui, China

State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026 China

E-mail: [email protected], [email protected], [email protected]Search for more papers by this author
First published: 19 September 2018
Citations: 72

Abstract

Lithium–sulfur (Li–S) batteries have attracted more and more attention because they represent one of the most promising candidates to satisfy emerging energy storage demands. The biggest challenge regarding the application of the Li–S battery is to suppress the polysulfide shuttle while maintaining a high sulfur loading mass. Here, a dual polysulfide confinement strategy is designed by confinement of sulfur in polydopamine-coated MXene nanosheets (denoted as S@Mxe@PDA) that performs as a high-performance cathode for Li–S cells owing to their inherently high underlying metallic conductivity and chemical bonding and strong chemical adsorption to lithium polysulfides (LPs). This dual LPs confinement strategy is supported by the results of density functional theory calculations. It is demonstrated that the S@Mxe@PDA cathode exhibits outstanding electrochemical properties, including high reversible capacity (1044 mAh g−1 after 150 cycles at 0.2 C), superior rate capability (624 mAh g−1 at 6 C) and excellent cycling stability (556 mAh g−1 after 330 cycles at 0.5 C with 4.4 mg cm−2 sulfur loading). This work offers a facile and effective method for boosting Li–S batteries into practical applications.

Conflict of Interest

The authors declare no conflict of interest.

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