共价有机骨架
阳极
共价键
拉曼光谱
电解质
碳纳米管
材料科学
化学工程
傅里叶变换红外光谱
钾
化学
电极
有机化学
纳米技术
物理化学
光学
物理
工程类
作者
Xiaoxi Luo,Wenhao Li,Haojie Liang,Hongxia Zhang,Kai‐Di Du,Xiaogang Wang,Xinfang Liu,Jingping Zhang,Xing‐Long Wu
标识
DOI:10.1002/ange.202117661
摘要
Abstract 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 π‐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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