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Bottom‐Up Construction of Porous Organic Frameworks with Built‐In TEMPO as a Cathode for Lithium–Sulfur Batteries
Author(s) -
Zhou Baolong,
Hu Xiang,
Zeng Guang,
Li Shiwu,
Wen Zhenhai,
Chen Long
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201700749
Subject(s) - sulfur , faraday efficiency , porosity , cathode , moiety , materials science , chemical engineering , covalent bond , porous medium , anode , nanotechnology , chemistry , composite material , electrode , organic chemistry , metallurgy , engineering
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 −1 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.