双螺旋液晶聚(2,2'-二磺酰基-4,4'-联苯胺对苯二甲酰胺)复合材料及其在锂电池中的应用  

Double Helical Liquid Crystalline Poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide)Composite Material and Its Application in Lithium Batteries

作　　者：纪非凡 汪莹 Fei-fan Ji;Ying Wang(Department of Macromolecular Science,State Key Laboratory of Molecular Engineering of Polymers,Fudan University,Shanghai 200438)

机构地区：[1]聚合物分子工程国家重点实验室,复旦大学高分子科学系,上海200438

出　　处：《高分子学报》2024年第7期826-840,共15页Acta Polymerica Sinica

摘　　要：聚(2,2'-二磺酰基-4,4'-联苯胺对苯二甲酰胺)(PBDT)是一种主链型液晶聚电解质,其具有全芳香分子结构单元、超高的磺酸根密度以及可以形成分子内和分子间氢键网络的酰胺基团.本文介绍了PBDT在水溶液中表现出的一系列特殊性质,包括自组装成双螺旋构象、溶致向列液晶相、微米级超长持续长度以及沿聚合物链的各向异性离子传输.指出通过PBDT分子链的多尺度分子构象以及其选择性的离子传输特性,可以设计出具有各种功能的复合材料,例如PBDT基水凝胶、离子凝胶以及纳米复合材料.分析表明PBDT中高度取向的刚性棒状结构以及各向异性的反离子快速传输机制,不仅实现了PBDT在固态电解质和锂电池电极黏结剂等领域的潜在应用,同时也预示着与PBDT有类似性质的刚性棒状聚电解质材料的开发在能源储存与转化领域以及其他相关应用方向的潜在应用价值.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.

关 键 词：刚性棒状聚电解质 双螺旋构象 液晶相 各向异性离子传输 锂电池 

分 类 号：TB33[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]