Effect of porosity on PYdF-co-HFP-PMMA-based electrolyte

A novel MPPBEM based on PVdF-co-HFP - PMMA was prepared with a preferential polymer dissolution process. The N-2 gas adsorption/desorption and SEM analysis were used to reveal the porous structure of the polymer matrix and attain the maximum pore size in the range of 251 nm. AC-impedance spectroscopy measurement was carried out to investigate the ionic conductivity of MPPBEMs and achieved a maximum ionic conductivity of 10.23 x 10(-3) S cm(-1) at room temperature. The lithium transference numbers of MPPBEMs were measured using the DC-polarization method coupled with AC-impedance spectra are found to be above 0.639. Finally, the electrode/electrolyte interfacial resistance was evaluated by monitoring the impedance response at different time intervals. (c) 2007 Elsevier B.V. All rights reserved.