Tuning Ionic Conductivity of Block Copolymer Electrolytes via Functionalized Additives
발표자
()
초록
내용
Block copolymer electrolytes based on poly(ethylene oxide) (PEO) have been regarded as promising candidates of solid electrolyte materials for lithium batteries. This is attributed to the ability of ether oxygen moieties to dissolve lithium salts and transport lithium ion. However, the ionic conductivity dramatically decreases at low temperatures below melting point of PEO. To resolve this drawback, various strategies have been proposed to reduce PEO crystallinity. Herein, we investigate a new method to modulate crystallization behavior of PEO-based block copolymers with embedded end-group-functionalized PEO homopolymers. Intriguingly, the ionic conductivity and morphology of the resultant block copolymer/homopolymer blends is sensitive function of the type of end group in PEO homopolymers at the same blend ratio. Our work offers a platform for the development of solid-state polymer electrolytes by controlling intermolecular interactions in PEO phases via simple end-group chemistry.