Double Helical Liquid Crystalline Poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide)Composite Material and Its Application in Lithium Batteries
As a main-chain liquid crystalline polyelectrolyte,poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide)(PBDT)is characterized by its fully aromatic architecture,ultra-high density of sulfonate groups,intramolecular and intermolecular hydrogen bond networks formed by the amide groups.Here we describe a series of distinctive characteristics of PBDT solutions,including the self-assembled double helical conformations,formation of nematic liquid crystalline phases,and anisotropic ion transport along polymer chains.Based on the multi-scale molecular conformation of PBDT and its selective ion transport properties,composite materials with various functions can be designed,such as PBDT-based hydrogels,ionogels and nanocomposites.By emphasizing the rigid rod architecture and the anisotropic ion transport mechanism of counter ions in PBDT,the applications of PBDT composites in solid-state electrolytes and lithium battery electrode binders have been highlighted;meanwhile,indicating potential significance for the development of other rigid-rod polyelectrolyte materials similar as PBDT for the field of new energy storage and conversion and other related areas.
Rigid rod polyelectrolytesDouble helical conformationLiquid crystalline phaseAnisotropic ion transportationLithium batteries
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