| 초록 |
The motivation for the development of solid polymer electrolytes (SPEs) arises from advantages of safety over liquid electrolytes, in particular their inhibition of dendrite growth and nonflammability. However, SPEs have lower conductivities than their liquid counterparts. Poly(ethylene oxide) (PEO) has been studied extensively as a polymer host. PEO films have good mechanical properties, but in most cases, the reported conductivity was quite low (1 x 10-8 Scm-1) at room temperature due to high crystallinity and low salt dissociation of PEO. Succinonitrile (SN) was applied to PEO electrolytes to control the degree of crystallinity and its high polarity assists the salt dissociation in PEO. PEO-SN blend in equal weight fraction showed room temperature ionic conductivity of 10-8 Scm-1 with nearly two orders of magnitude higher than that of pure PEO system. In addition, PEO-salt complex resulted in highly improved ionic conductivity of ~4 x 10-4 Scm-1 at 25 ℃. |
