| 초록 |
Polyethylene oxide (PEO) has long been considered as a promising candidate of solid polymer electrolytes in lithium batteries. However, the practical uses have far-fetched because of high crystallinity of PEO, retarding lithium ion transport below its melting point. Paradoxically, when temperature is increased above the melting temperature of PEO, mechanical strength of the electrolytes is lost. One may overcome these issues by combining PEO with hard polymer, prompting a great deal of research on PS-PEO block copolymer electrolytes. Herein, we propose a new approach for further improvement of ion transport properties, that is, the introduction of end-functional groups to PS-PEO. The strong dipolar interactions of end-functional groups resulted in reduction of PEO crystallinity so that room temperature conductivity can be significantly improved. Further, the effective interactions of end-functional groups with lithium salt were proven to enhance lithium cation transport efficiency. |
