Volume 63, Issue 1 e202316208
Research Article

Dendritic sp Carbon-Conjugated Benzothiadiazole-Based Polymers with Synergistic Multi-Active Groups for High-Performance Lithium Organic Batteries

Yingnan Cao

Yingnan Cao

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

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Yi Sun

Yi Sun

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

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Dr. Chaofei Guo

Dr. Chaofei Guo

College of Chemical and Material Engineering, Zhejiang A&F University, 666 Wusu Street, 311300 Hangzhou, Zhejiang, P. R. China

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Prof. Weiwei Sun

Prof. Weiwei Sun

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

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Prof. Yang Wu

Prof. Yang Wu

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

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Prof. Yi Xu

Prof. Yi Xu

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

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Dr. Tiancun Liu

Dr. Tiancun Liu

Institute of New Energy, School of Chemistry and Chemical Engineering, Shaoxing University, 900 Chengnan Avenue, 312000 Shaoxing, Zhejiang, P. R. China

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Prof. Yong Wang

Corresponding Author

Prof. Yong Wang

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai University, 99 Shangda Road, 200444 Shanghai, P. R. China

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First published: 21 November 2023
Citations: 24

Graphical Abstract

The C≡C linked covalent benzothiadiazole-based organic polymer with fluorine side groups is obtained for lithium organic batteries and exhibits superior electrochemical properties through the optimized molecule structure among alkynyl, benzothiadiazole, and fluorine groups.

Abstract

Green organic materials composed of C, H, O, and N elements are receiving more and more attention worldwide. However, the high solubility, poor electrical conductivity, and long activation time limit the development of organic materials in practice. Herein, two stable covalent organic materials with alkynyl linkage between benzene rings and benzothiadiazole groups with different amounts of fluorine atoms modification (defined as BOP-0F and BOP-2F), are designed for lithium-ion batteries. Both BOP-0F and BOP-2F can achieve superior reversible capacities of ≈719.8 and 713.5 mAh g−1 over 100 cycles on account of the redox activity of alkynyl (two-electron involved) and benzothiadiazole units (five-electron involved) in these organic materials. While BOP-2F electrodes exhibit much more stable cycling performance than BOP-0F electrodes, especially without pronounced capacity ascending during initial cycling. It can be assigned to the synergy effect of alkynyl linkage and fluorine atom modification in BOP-2F. The lithium storage and activation mechanism of alkynyl, benzothiadiazole, and fluorine groups have also been deeply probed by a series of material characterizations and theoretical simulations. This work could be noteworthy in providing novel tactics for the molecular design and investigation of high-efficiency organic electrodes for energy storage.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.