| 초록 |
Recently, Li-ion batteries comprising poly(ethyleneoxide) (PEO)-based electrolytes have been highlighted due to their high energy density and electrochemical stability, while the poor mechanical strength of PEO enforced to use separator. This prompted the development of new polymer electrolytes composed of mechanically robust polymer chains as well as PEO. In particular, nanostructure becomes of importance to improve ionic conductivity. Herein, we report the modulation of morphology and conductivity of PEO-containing block copolymers with the addition of single end-functional group. A variety of morphologies such as lamellae, cylinder, and gyroid were seen from the same block copolymer by changing terminal groups, as rationalized by the alteration in intermolecular interactions. The end-group attachment also resulted in an order of magnitude different Li-ion conductivity where the gyroid-forming sample showed twofold-improved ion transport efficiency, compared to the disordered sample. |
