Li Mingming, Yu Jun, Xue Yali, Wang Kai, Wang Qimeng, Xie Zhiying, Wang Lei, Yang Yu, Wu Jianping, Qiu Xiaoyan, Yu Haizhou
Institute of Advanced Synthesis (IAS), School of Chemistry and Molecular Engineering, Nanjing Tech University (Nanjing Tech), Nanjing 211816, People's Republic of China.
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, People's Republic of China.
ACS Appl Mater Interfaces. 2023 Jan 18;15(2):2922-2932. doi: 10.1021/acsami.2c18407. Epub 2023 Jan 4.
Lithium-sulfur batteries (LSBs) have attracted much attention due to their high energy density and theoretical specific capacity. However, the "shuttle effect" of polysulfides limits their application. Herein, we propose a postsynthetic modification (PSM) strategy to synthesize a fibrous carborane-tailored covalent organic framework (PMCB-COF). Benefiting from its amphiphilicity, strong adsorption ability, high specific surface area, and accessible Li transport channels, PMCB-COF could serve as a barrier to polysulfide to inhibit the shuttle effect. The cell assembled with PMCB-COF exhibits a high initial capacity of 926 mAh g at 1 C. A Coulombic efficiency of 98% and a fading rate of only 0.039% per cycle are exhibited even after 1500 cycles. So far as we know, PMCB-COF is one of the best materials as a separator of LSBs. This work provides a safe and efficient avenue for tailoring COFs with carborane and might help promote the development of secure, low-cost, and durable rechargeable batteries.
锂硫电池（LSBs）因其高能量密度和理论比容量而备受关注。然而，多硫化物的“穿梭效应”限制了它们的应用。在此，我们提出一种后合成修饰（PSM）策略来合成一种含碳硼烷的纤维状共价有机框架（PMCB-COF）。得益于其两亲性、强吸附能力、高比表面积和可及的锂传输通道，PMCB-COF可作为多硫化物的屏障以抑制穿梭效应。采用PMCB-COF组装的电池在1 C下表现出926 mAh g的高初始容量。即使在1500次循环后，仍表现出98%的库仑效率和仅0.039%/循环的衰减率。据我们所知，PMCB-COF是作为锂硫电池隔膜的最佳材料之一。这项工作为用碳硼烷定制共价有机框架提供了一条安全有效的途径，并可能有助于推动安全、低成本和耐用的可充电电池的发展。
