Aluminum‐ion batteries (AIBs) are regarded as one of the most promising types of energy storage device in light of the safety, natural abundance, and electrochemical properties of aluminum. However, the rate capabilities of AIBs are limited owing to the sluggish kinetics of chloroaluminate anions. In this study, a covalent organic framework (COF) is adopted as the cathode material in AIBs. Theoretical and experimental results suggest that the COFs allow fast anion diffusion and intercalation without structure collapse, owing to the robust frameworks and the hierarchical pores with a large specific surface area of 1794 m² g⁻¹. The resultant AIB exhibits remarkable long‐term stability, with a reversible discharge capacity of 150 mAh g⁻¹ after 13 000 cycles at 2 A g⁻¹. It also shows an excellent rate capability of 113 mAh g⁻¹ at 5 A g⁻¹. This work fully demonstrates the potential of COFs in the storage of chloroaluminate anions and other large‐sized ions.

中文翻译：

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具有增强的铝储存特性的二维共价有机骨架。

考虑到铝的安全性，自然丰度和电化学性能，铝离子电池（AIB）被认为是最有前途的储能设备之一。但是，由于氯铝酸根阴离子的动力学缓慢，AIB的速率能力受到限制。在这项研究中，共价有机框架（COF）被用作AIBs中的阴极材料。理论和实验结果表明，由于具有强大的骨架和具有1794 m ²  g ^-1的大比表面积的分层孔隙，COF允许阴离子快速扩散和嵌入而不会发生结构塌陷。所得的AIB具有出色的长期稳定性，可逆放电容量为150 mAh g ^-1在2 A g ^-1下进行13 000次循环后。它还显示出在5 A g ^-1时113 mAh g ^-1的优异速率能力。这项工作充分证明了COF在氯铝酸根阴离子和其他大型离子存储中的潜力。