Shao Guangwei, Liu Hang, Chen Li, Wu Mingliang, Wang Dongxue, Wu Di, Xia Jianlong
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Center of Smart Materials and Devices, Wuhan University of Technology Wuhan 430070 China
School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology Wuhan 430070 China
Chem Sci. 2024 Jan 23;15(9):3323-3329. doi: 10.1039/d3sc06331c. eCollection 2024 Feb 28.
Replacing the C[double bond, length as m-dash]C bond with an isoelectronic BN unit is an effective strategy to tune the optoelectronic properties of polycyclic aromatic hydrocarbons (PAHs). However, precise control of the BN orientations in large PAH systems is still a synthetic challenge. Herein, we demonstrate a facile approach for the synthesis of BN embedded perylene diimide (PDI) nanoribbons, and the polarization orientations of the BN unit were precisely regulated in the two PDI trimers. These BN doped PDI oligomers show great potential as organic cathodes for potassium-ion batteries (PIBs). In particular, -PTCDI3BN exhibits great improvement in voltage potential, reversible capacities ( 130 mA h g), superior rate performance (19 s to 69% of the maximum capacity) and ultralong cyclic stability (nearly no capacity decay over 30 000 cycles), which are among those of state-of-the-art organic-based cathodes. Our synthetic approach stands as an effective way to access large PAHs with precisely controlled BN orientations, and the BN doping strategy provides useful insight into the development of organic electrode materials for secondary batteries.
用等电子体的BN单元取代C═C键是调节多环芳烃（PAHs）光电性质的有效策略。然而，在大型PAH体系中精确控制BN的取向仍然是一个合成挑战。在此，我们展示了一种简便的方法来合成BN嵌入的苝二酰亚胺（PDI）纳米带，并且在两个PDI三聚体中精确调控了BN单元的极化取向。这些BN掺杂的PDI低聚物作为钾离子电池（PIBs）的有机阴极具有巨大潜力。特别是，-PTCDI3BN在电压电势、可逆容量（130 mA h g）、优异的倍率性能（19 s时达到最大容量的69%）和超长循环稳定性（30000次循环几乎没有容量衰减）方面表现出色，这些性能在最先进的有机基阴极中名列前茅。我们的合成方法是获得具有精确控制BN取向的大型PAHs的有效途径，并且BN掺杂策略为二次电池有机电极材料的开发提供了有用的见解。
