Developing high-performance aqueous symmetric all-organic batteries (SAOBs) by replacing metal-based batteries or batteries with organic electrolytes is highly attractive to achieve a greener rechargeable world. However, such a new energy storage system still exhibits unsatisfactory rate capability and cycling stability due to the limitations in electrode materials screening. Here, a novel covalent organic framework (COF) containing abundant CN and CO for the electrode material is designed, which is combined with graphene and assembled into all-COF/graphene batteries for the first time. Moreover, the co-storage of Zn²⁺ and H⁺ in COF can be achieved in a mild aqueous electrolyte. Impressively, benefiting from the extended porous structure of COF, plentiful active reaction sites, more extensive electron delocalization from CO modification at molecular level, as well as enhanced fast H⁺ storage capacity of graphene and CO in COF, this kind of SAOBs show excellent cycle life and high rate performance (over 15000 cycles with a capacity of 80 mAh g⁻¹ at a high current density of 5 A g⁻¹ in pouch cell). This work will open a new window for the design of high-performance aqueous organic batteries, further moving toward a more eco-friendly electrochemical world.

中文翻译：

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环保型高性能对称全 COF/石墨烯水性锌离子电池


通过用有机电解质替代金属基电池或电池来开发高性能水性对称全有机电池 （SAOB），对于实现更环保的可充电世界极具吸引力。然而，由于电极材料筛选的限制，这种新型储能系统仍然表现出不令人满意的倍率能力和循环稳定性。在这里，设计了一种以电极材料为电极材料，含有丰富的 CN 和 CO 的新型共价有机框架 （COF），该框架与石墨烯结合并首次组装成全 COF/石墨烯电池。此外，Zn²⁺ 和 H⁺ 在 COF 中的共储存可以在温和的水性电解质中实现。令人印象深刻的是，得益于 COF 的扩展多孔结构、丰富的活性反应位点、分子水平上 CO 修饰的更广泛的电子离域，以及石墨烯和 CO 在 COF 中增强的快速 H⁺ 存储能力，这种 SAOB 表现出优异的循环寿命和高倍率性能（超过 15000 次循环，容量为 80 mAh ^g-1，电流密度为 5 A ^g-1在软袋细胞中）。这项工作将为高性能水性有机电池的设计打开一扇新窗口，进一步迈向更环保的电化学世界。