Li Hongyang, Tang Mi, Wu Yanchao, Chen Yuan, Zhu Shaolong, Wang Bo, Jiang Cheng, Wang Erjing, Wang Chengliang
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering , Hubei University , Wuhan 430062 , People's Republic of China.
School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics (WNLO) , Huazhong University of Science and Technology , Wuhan 430074 , China.
J Phys Chem Lett. 2018 Jun 21;9(12):3205-3211. doi: 10.1021/acs.jpclett.8b01285. Epub 2018 Jun 1.
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.
有机钠离子电池（OSIBs）是无机锂离子电池很有前景的替代方案。OSIBs的阴极仍然存在容量低、倍率性能差和循环寿命短的问题。首次，我们展示了大π共轭多孔框架（CPFs）作为OSIBs的阴极，这是基于这样的推测：CPFs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。基于所获得的CPFs的电池确实在没有任何复杂后处理的情况下表现出比小分子结构单元更好的电化学性能。CPFs适度的比表面积和详细分析表明，微孔和层状结构应该是快速离子扩散的原因。我们相信这项工作将激发人们对通过功能分子设计实现高性能的用于OSIBs的CPFs的日益增长的兴趣，并为大规模应用中实现OSIBs铺平道路。
