Cationic covalent organic framework via cycloaddition reactions as sulfur-loaded matrix for lithium-sulfur batteries. (March 2022)

• Record Type: Journal Article
• Authors: Liu, Xin; Xia, Meng; Zhao, Yuxiang; Xia, Tian; Li, Yongpeng; Xiao, Juanxiu; Sui, Zhuyin; Chen, Qi
• Is Part Of: Materials today chemistry. Volume 23(2022)
• Publication Date: 2022-03
• Subjects: Covalent organic frameworks (COFs) -- Postsynthetic modification -- Quaternary ammonium cations -- Sulfur-loaded materials; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2021.100664
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: The postsynthetic modification provided effective approaches for the functionalization of imine covalent organic frameworks (COFs). To address the rapid decline of sulfur cathodes caused by the shuttle effect of soluble lithium polysulfide, cationic COFs (COF-PA-AI) used as sulfur-loaded matrix materials for lithium-sulfur (Li-S) batteries was designed and prepared by cycloaddition. Benefiting from the ordered channels and the strong interaction between quaternary ammonium cations and polysulfide anions, COF-PA-AI/S displayed faster electrochemical kinetics, greater tolerance to high current shocks, and better rate performance as the cathode. Besides, the discharge capacity of COF-PA-AI/S also remained at 665.3 mA h/g after 200 cycles at 0.5 °C, which was higher than that of COF-Ph/S. This work not only demonstrated the possibility of a postfunctionalization method based on the intermediate COF-PA but also expanded the scope of application of the COFs and provided a new idea for the application of COF materials to the cathodes of Li-S batteries. Graphical abstract: Image 1 Highlights: The cationic covalent organic framework was designed and prepared by cycloaddition reaction. The COF-PA-AI as a sulfur-loaded material has improved the performance of Li-S batteries. The COF-PA-AI with quaternary ammonium cations can effectively inhibit the shuttle effect of Li-S batteries.