| 초록 |
The ion transporting properties of poly(ethyleneoxide) (PEO) have been studied as polymer electrolytes for lithium ion batteries, due to its ability of lithium ion solvation. However, PEO is a semi-crystalline polymer and the ionic conduction occurs mostly in the amorphous phases, so the molecular design to increase the segmental motion is critical to improving the ionic conductivity. Siloxanes are low Tg materials and thermally stable. Siloxanes comprised by oligo(ethyleneoxide) as electrolyte will not make carbonate bond dissociation in cell cycle. And cyclic forms of siloxanes will have very similar boiling points but lower viscosities and vapor pressures in comparison with those of linear forms. Therefore, oligomeric PEO chains have been grafted onto cyclosiloxanes via hydrosilylation. In this study, substituted cyclosiloxanes with oligo(ethyleneoxide) side-chains were synthesized, and their thermal properties and lithium ion conductivities of thin films were investigated. |
