锂电池用嵌段共聚物电解质的研究进展

离子导体嵌段共聚物电解质作为一种固态锂电池导离子材料引起了人们的广泛关注。嵌段共聚物的自组装行为为设计微观尺寸有序结构提供了一种可能。这种有序纳米结构既保证聚合物电解质良好的机械性能,同时又拥有与其它聚合物电解质相当的离子电导率,为进一步组装高性能、易加工的锂电池器件提供了一种可能。本文综述了聚氧化乙烯型嵌段共聚物和单离子型嵌段共聚物,并总结了近期嵌段共聚物电解质的形貌影响离子电导率的实验研究结果,最后评述了嵌段共聚物电解质面临的挑战,并对未来研究进行了展望。

Block Copolymer Electrolytes for Lithium Batteries

Ion-conducting block copolymers(BCPs) as conducting materials have attracted significant interests in solid state lithium batteries. BCP self-assembly offers promise for designing ordered materials with nanoscale domains. Such nanostructures provide a facile method for introducing sufficient mechanical stability into polymer electrolyte membranes, while maintaining the ionic conductivity at levels similar to corresponding solvent-free homopolymer electrolytes. This ability to simultaneously control conductivity and mechanical integrity provides opportunities for the fabrication of sturdy, yet easily processable, solid-state lithium batteries. This review presents a brief overview of recent progress in ion-conducting block copolymers base on polyoxyethylene and single ion conductors. We also summarize some experimental studies of BCP electrolytes with respect to the effects of morphology on ionic conductivity. Finally, we present some remaining challenges for BCP electrolytes and highlight several important areas for future research.