Tianjin Key Laboratory of Molecular Optoelectronic Science, School of Science, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin, 300072, China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
ChemSusChem. 2017 Jul 21;10(14):2955-2961. doi: 10.1002/cssc.201700749. Epub 2017 Jun 26.
Two redox-active porous organic frameworks (POFs) with a built-in radical moiety (TEMPO) and hierarchical porous structures were synthesized through a facile bottom-up strategy and studied as cathode materials for lithium-sulfur (Li-S) batteries. The sulfur loading in these two POFs reached 61 %, benefitting from their large pore volumes. Owing to the highly dense docking sites of TEMPO, sulfur could be covalently immobilized within the porous networks and efficiently inhibit the shuttle effect, thereby significantly improving the cycling performance. The composites TPE-TEMPO-POF-S (TPE=tetraphenylethene) deliver a capacity in excess of 470 mAh g after 200 cycles with a coulombic efficiency of around 100 % at a current rate of 0.1 C. Furthermore, TEMPO-POFs with sulfur embedded showed excellent rate capability with limited capacity loss at rates of 0.1-1 C.
两种具有内置自由基部分（TEMPO）和分级多孔结构的氧化还原活性多孔有机骨架（POF）通过简便的自下而上策略合成，并被研究用作锂硫（Li-S）电池的阴极材料。这两种 POF 的硫负载量达到 61%，这得益于它们较大的孔体积。由于 TEMPO 的高密度锚固位点，硫可以在多孔网络中发生共价固定，并有效地抑制穿梭效应，从而显著改善循环性能。复合材料 TPE-TEMPO-POF-S（TPE=四苯乙烯）在电流速率为 0.1 C 时，经过 200 次循环后具有超过 470 mAh g 的容量，且库仑效率约为 100%。此外，嵌入硫的 TEMPO-POF 具有出色的倍率性能，在 0.1-1 C 的速率下容量损失有限。
