Fujian Institute of Materials and Materials Co., Ltd. took in the application research of lithium-sulphur batteries for covalent organic frame materials

Fujian Institute of Materials and Materials made progress in the application of lithium-sulfur batteries for covalent organic frame materials

Lithium-sulfur batteries have large theoretical capacity and high energy density, and cathode materials have a wide range of sulfur sources and are environmentally friendly, and are expected to become the next generation of high-performance lithium-ion batteries. However, there are still many technical challenges in its commercial application, such as the poor conductivity of solid sulfides, the shuttle effect of soluble polysulfide intermediates, and the large volume change during charging and discharging. These problems result in low sulfur utilization and cycle life. How to limit the shuttling effect of lithium polysulfide has become one of the current research hotspots while dramatically improving the discharge performance and stability.

Professor Wang Ruihu, researcher of Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and Tian Dongxu, a professor at Dalian University of Technology, selected organic ligands containing boric acid and cyano groups, and built two functional groups containing triazine rings and boroxine rings by self-polymerization. The binary covalent organic framework (COF) of the meta. This study not only solves the problem of the separation and purification of products that are faced by a variety of ligands through traditional orthogonal methods to construct binary COF, but also uses the COF as the main component of sulfur, utilizing its structural regularity, uniform pores, and rich active sites. The characteristics provide an ideal model for studying the chemical adsorption mechanism of host materials and polysulfides. Through electrochemical experiments and theoretical calculations, it was found that the triazine ring exhibited strong lithium-philic properties, and the boricoxane exhibited high thiophilicity. This amphiphilic effect enabled TB-COF to exhibit excellent polysulfide adsorption. The ability to effectively solve the shuttle effect of polysulfides significantly improves the cycling stability of lithium-sulfur batteries.

The research work was funded by the National Natural Science Foundation of China and the Chinese Academy of Sciences’ strategic pilot technology project. The relevant research results were published on Energy Storage Materials. The first author of the paper was Assistant Researcher Xiao Zhubing.

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