| 초록 |
Polystyrene-poly(ethylene oxide) block copolymers (PS-b-PEOs) are one of the promising candidates for lithium battery electrolytes, attributed to the great lithium salt-solvating ability of PEO chains and high ionic conductivity of salt-doped PEO. However, the intrinsic crystallinity of PEO caused a radical reduction in room temperature ionic conductivity, which has been tacked by adding various plasticizers, but in this case the advantage of the solid-state electrolytes vanished. Herein, we present an approach of end-group-chemistry onto PEO chains to solve this long-lasting drawbacks while maintaining the solid-states. For this, a set of nitrile end-functionalized PEOs having low molecular weights were prepared and blended into high-molecular-weight PS-b-PEO matrix. Interestingly, the number density and position of nitrile termini were found to largely alter the intermolecular interactions in PEO domains, leading to an improvement of electrochemical properties of blend electrolytes. |
