Covalent organic frameworks with lithiophilic and sulfiphilic dual linkages for cooperative affinity to polysulfides in lithium-sulfur batteries

One covalent organic framework containing triazine and boroxine units was generated through the simultaneous formation of two types of reversible covalent bonds. The triazine unit chemically absorbs lithium ions through lithiophilic interaction, while boroxine unit traps polysulfides through sulfiphilic interaction. The amphiphilic chemisorption cooperatively alleviates the dissolution and the shuttle effect of lithium polysulfides.235