Organic sodium-ion batteries (OSIBs) are promising alternatives of inorganic lithium-ion batteries. The cathodes of OSIBs still suffer from low capacity, poor rate performance, and low cyclability. For the first time, we demonstrate the large π-conjugated porous frameworks (CPFs) as cathodes for OSIBs, motivated by the speculation that the CPFs are capable of enhancing charge transport, facilitating ionic diffusion, inhibiting dissolution, as well as improving stability. The batteries based on the obtained CPFs indeed delivered much better electrochemical performance than the small molecular construction units without any complex post-treatments. The moderate BET surface area of CPFs and the detailed analyses suggested that the micropores and the lamellar structure should be responsible for the fast ionic diffusion. We believe that this work will provoke growing interest of CPFs for OSIBs with functional molecular design toward high performance and pave a venue to achieve OSIBs in large-scale applications.

中文翻译：

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大型π共轭多孔骨架作为钠离子电池的阴极

有机钠离子电池（OSIB）是无机锂离子电池的有前途的替代品。OSIB的阴极仍然遭受低容量，差的速率性能和低可循环性的困扰。首次，我们推测大型π共轭多孔骨架（CPF）作为OSIB的阴极，这是由于人们推测CPF能够增强电荷传输，促进离子扩散，抑制溶解以及提高稳定性。与没有任何复杂后处理的小分子结构单元相比，基于所获得的CPF的电池确实提供了更好的电化学性能。CPF的BET表面积适中，并进行了详细分析，表明微孔和层状结构应负责离子的快速扩散。