Wu, Xiaofeng, 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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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: | 40 Engineering, 4016 Materials Engineering, 34 Chemical Sciences, 3406 Physical Chemistry, 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: | 21 Jun 2024 06:11 |
| DOI: | 10.1021/jacs.1c08675 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3142721 |
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