Trimming the π bridge of microporous frameworks for bidentate anchoring of polysulfides to stabilize lithium–sulfur batteries

Jie Xu; Weiqiang Tang; Fengtao Yu; Shuangliang Zhao; Dongfang Niu; Xinsheng Zhang; Zhong Xin; Renjie Chen

doi:10.1039/D0TA06383E

Trimming the π bridge of microporous frameworks for bidentate anchoring of polysulfides to stabilize lithium–sulfur batteries†

Jie Xu,

‡^a Weiqiang Tang,

‡^a Fengtao Yu,^b Shuangliang Zhao,

^a Dongfang Niu,

*^a Xinsheng Zhang,^a Zhong Xin

*^a and Renjie Chen

*^c

Author affiliations

* Corresponding authors

^a State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
E-mail: dfniu@ecust.edu.cn, xzh@ecust.edu.cn

^b State Key Laboratory of Nuclear Resources and Environment, School of Chemistry, Biology and Materials Science, East China University of Technology, Nanchang, China

^c Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, China
E-mail: chenrj@bit.edu.cn

Abstract

Microporous frameworks with π-conjugated blocks and tunable electronic structures present enormous potential as energy-storage materials. However, the role of the π-bridge and structure–activity relationship have not been explored in lithium–sulfur (Li–S) batteries. Here, we report a π bridge trimming strategy for a semiconducting microporous framework (SMF) with tunable molecular polarity in redox-enhanced and dendrite-free Li–S batteries. The results demonstrate that the π bridge of SMFs plays an important role in polysulfide anchoring and anion immobilization, including the binding energy, charge transfer, redox kinetics, and cyclability, which can be finely regulated by molecular engineering. As a result, SMF-2 with a thiophene bridge achieves bidentate anchoring of lithium polysulfides, which delivers an ultralow capacity-fading rate of 0.033% per cycle for 1000 cycles at 1C and stable Li plating/stripping performance for 300 h. Our work may shed light on the molecular design of π-conjugated materials for advanced Li–S batteries.

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DOI: https://doi.org/10.1039/D0TA06383E
Article type: Paper
Submitted: 30 Jun 2020
Accepted: 11 Aug 2020
First published: 17 Aug 2020

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J. Mater. Chem. A, 2020,8, 19001-19010

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Trimming the π bridge of microporous frameworks for bidentate anchoring of polysulfides to stabilize lithium–sulfur batteries

J. Xu, W. Tang, F. Yu, S. Zhao, D. Niu, X. Zhang, Z. Xin and R. Chen, J. Mater. Chem. A, 2020, 8, 19001 DOI: 10.1039/D0TA06383E

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Journal of Materials Chemistry A

Trimming the π bridge of microporous frameworks for bidentate anchoring of polysulfides to stabilize lithium–sulfur batteries†

Abstract

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Trimming the π bridge of microporous frameworks for bidentate anchoring of polysulfides to stabilize lithium–sulfur batteries

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