Scalable Synthesis of Ultrathin Polyimide Covalent Organic Framework Nanosheets for High-Performance Lithium−Sulfur Batteries

Wu, Xiaofeng ORCID: 0000-0001-5549-8836, Duan, Haiyan, Li, Ke, Xie, Mo, Chen, Jiaming, Zhou, Hougan, Ning, Guohong, Cooper, Andrew and Li, Dan (2021) Scalable Synthesis of Ultrathin Polyimide Covalent Organic Framework Nanosheets for High-Performance Lithium−Sulfur Batteries. Journal of the American Chemical Society, 143 (46). pp. 19446-19453.

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Official URL: http://dx.doi.org/10.1021/jacs.1c08675

Abstract

Development of new porous materials as hosts to suppress the dissolution and shuttle of lithium polysulfides is beneficial for constructing highly efficient lithium-sulfur batteries (LSBs). Although 2D covalent organic frameworks (COFs) as host materials exhibit promising potential for LSBs, their performance is still not satisfactory. Herein, we develop polyimide COFs (PI-COF) with a well-defined lamellar structure, which can be exfoliated into ultrathin (∼1.2 nm) 2D polyimide nanosheets (PI-CONs) with a large size (∼6 μm) and large quantity (40 mg/batch). Explored as new sulfur host materials for LSBs, PI-COF and PI-CONs deliver high capacities (1330 and 1205 mA h g<sup>-1</sup> at 0.1 C, respectively), excellent rate capabilities (620 and 503 mA h g<sup>-1</sup> at 4 C, respectively), and superior cycling stability (96% capacity retention at 0.2 C for PI-CONs) by virtue of the synergy of robust conjugated porous frameworks and strong oxygen-lithium interactions, surpassing the vast majority of organic/polymeric lithium-sulfur battery cathodes ever reported. Our finding demonstrates that ultrathin 2D COF nanosheets with carbonyl groups could be promising host materials for LSBs with excellent electrochemical performance.

Item Type:	Article
Uncontrolled Keywords:	7 Affordable and Clean Energy
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	04 Nov 2021 08:25
Last Modified:	15 Mar 2024 10:07
DOI:	10.1021/jacs.1c08675
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3142721