期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202117661
关键词
Covalent Organic Framework; Energy Storage; Organic Anode; Potassium-Ion Battery
资金
- National Natural Science Foundation of China [91963118, 52173246]
- 111 Project [B13013]
This study reports an exfoliated polyimide COF composite prepared on single-walled carbon nanotubes as an advanced anode for potassium-ion batteries, demonstrating efficient ion diffusion and extended stability.
Covalent organic frameworks (COF) possess a robust and porous crystalline structure, making them an appealing candidate for energy storage. Herein, we report an exfoliated polyimide COF composite (P-COF@SWCNT) prepared by an in situ condensation of anhydride and amine on the single-walled carbon nanotubes as advanced anode for potassium-ion batteries (PIBs). Numerous active sites exposed on the exfoliated frameworks and the various open pathways promote the highly efficient ion diffusion in the P-COF@SWCNT while preventing irreversible dissolution in the electrolyte. During the charging/discharging process, K+ is engaged in the carbonyls of imide group and naphthalene rings through the enolization and pi-K+ effect, which is demonstrated by the DFT calculation and XPS, ex-situ FTIR, Raman. As a result, the prepared P-COF@SWCNT anode enables an incredibly high reversible specific capacity of 438 mA h g(-1) at 0.05 A g(-1) and extended stability. The structural advantage of P-COF@SWCNT enables more insights into the design and versatility of COF as an electrode.
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