Lithium sulfur battery cathode materials based on COFs ordering

Abstract

In recent years, lithium-sulfur batteries and fuel cells, as a kind of new energy which is expected to replace traditional fossil fuels, have attracted people’s attention. At present, the “shuttle effect” of lithium-sulfur batteries is one of the key factors limiting the performance and application of lithium-sulfur batteries. It is urgent to find a suitable positive electrode composite material to suppress the “shuttle effect”. Covalent organic compounds (COFs) have been considered as ideal potential cathode composites for the anchors of sulfur and lithium compounds because of their regularized structure and polar functional groups. This paper mainly discusses the structure order of COF material, and gives the synthesis method of this kind of porous polymer material. The method of COFs synthesis is to design and assemble 2-D and 3-D COFs materials with different topological structures by choosing different geometrically constructed monomers and linking methods. Lithium-sulfur battery is a kind of battery with high energy density and theoretical capacity. The key to solve the shuttle effect is to find a suitable cathode composite material. Based on the order of COFs material structure, the feasibility and advantages of COFs as cathode material for lithium sulfur batteries were proposed.