Various alternatives of Li-ion batteries (LIBs) have been developed due to the scarcity of Li resources and growing demand of LIBs. However, most of these candidates are suffering the challenges of sluggish intercalations of large-sized ions (e.g. Na⁺, K⁺ or anions etc.), leading to low capacity, poor cycleability and particularly performance decay at high rate. Herein, we report the precise synthesis of a novel conjugated polymer (polypyrene sulfide, PPYS) and its application in storage of anions. Furthermore, we propose a novel concept that the electropositive covalent organic frameworks (COFs) could be able to adsorb anions by electrostatic attractions and thereby facilitate the transport of anions. This novel concept for enhancing the intercalation kinetics of large-sized anions is demonstrated by using the PPYS cathodes as proof-of-concept. After addition of small amount COFs, the capacity, the rate capability and the cycleability of PPYS are improved impressively. Such strategy can be expected to be universal to other redox polymers and may be also applicable to enhance the transport of other large-sized ions in multifunctional applications. These results will also extend the application fields of COFs.

由于锂资源的稀缺和对锂离子电池的需求不断增长，已经开发出各种锂离子电池（LIB）替代品。但是，这些候选物中的大多数都面临着大型离子（例如Na ⁺，K ⁺或阴离子等），导致容量低，循环能力差，尤其是高速率时的性能下降。在这里，我们报告了新型共轭聚合物（聚py硫化物，PPYS）的精确合成及其在阴离子存储中的应用。此外，我们提出了一个新颖的概念，即正电共价有机骨架（COF）能够通过静电吸引作用吸附阴离子，从而促进阴离子的运输。通过使用PPYS阴极作为概念验证，证明了用于增强大尺寸阴离子的嵌入动力学的这一新颖概念。添加少量COF后，PPYS的容量，速率能力和循环能力得到显着提高。可以预期这种策略对于其他氧化还原聚合物是通用的，并且还可适用于在多功能应用中增强其他大尺寸离子的传输。这些结果还将扩展COF的应用领域。