Enhanced electrochemical properties of poly(ethylene oxide) electrolytes with nitrile end-functional groups
발표자
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초록
내용
Poly(ethylene oxide) (PEO)-based polymers doped with lithium salts have been widely investigated as polymer electrolytes for lithium-ion batteries. However, achieving high ionic conductivity and electrochemical stability from solid-state PEO electrolytes has been a major scientific challenge. In this work, we investigated PEO electrolytes having nitrile terminal moieties. The introduction of nitrile end-groups helped Li+ solvation by forming interchain –C≡N∙∙∙Li+∙∙∙(EO)n coordination. This created partially opened shell structures to enhance Li+ relaxation dynamics, resulting in more than 2-fold increased lithium transference number. Particularly, the coordination interactions largely widened the electrochemical stability window of EO backbones. The effects of the number density and tethered position of the nitrile end-groups on electrolyte properties of salt-doped PEOs were systematically studied for the development of advanced solid-state polymer electrolytes.