Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10631352 | Journal of Non-Crystalline Solids | 2005 | 5 Pages |
Abstract
New solid polymer electrolytes were fabricated by the addition of lithium perchlorates in the blends of polyethylene oxide (PEO, MWÂ =Â 5Â ÃÂ 106) and poly-4-vinylpyridine (PVP, MWÂ =Â 1.6Â ÃÂ 106). Not only the coordinating bonding between ether units (-O-) of PEO and Li+ ions at about 1100Â cmâ1 but also the existence of pyridine salts at about 3500Â cmâ1 were definitely observed in the FT-IR spectra. The addition of PVP in the PEO matrix is to restrict mobility of ClO4- ions through the coupling of PVP and ClO4- ions. Therefore, the increase of PVP content is expected to decrease the self-discharge rate. In the case of PEO-PVP blends without LiClO4, the melting temperature Tm and the degree of crystallinity were decreased by the increase of PVP content. On the contrary, those of PEO-PVP blends with LiClO4 were increased with the increase of PVP content. The results can be explained lay ClO4- ions, which reduced the crystallinity of PEO by steric hindrance, segregated from the PEO by the coupling of PVP and ClO4- ions. The new solid polymer electrolytes based on PEO-PVP blends showed ionic conductivities of the order of 10â8 to 10â7Â S/cm.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Young-Wook Park, Dong-Sung Lee,