| 초록 |
To improve the low ionic conductivity of solid polymer electrolyte (SPE) we prepared poly(ether urethane) (PEU) based SPEs containing the salt of lithium triflate (LiCF3SO3, LiTf) and introduced polymer-in-salt system with the ion hopping mechanism through ion percolation path. The hard segments in PEUs can greatly improve the mechanical properties of the resulting SPEs as well as the polar group of soft segment, and the urethane group of hard segment in the PEUs can dissolve Li cations. PEU was prepared from 4,4'-methylenebis(phenyl isocyanate) (MDI), polypropylene glycol (PPG), and 1,4-butanediol (1,4-BD). SPEs were made by solution casting method on a stainless steel electrode from a solution including PEU, N, N’-dimethyl acetamide (DMAc), and lithium trifluoromethanesulfonate (LiCF3SO3). And the ionic conductivities of SPEs with polymer-in-salt system were investigated by using ac impedance analyzer. |
