A method to achieve full incorporation of PMMA-based gel electrolyte in fiber-structured PVB for solid-state electrochromic device fabrication

摘要

Based on the modified PMMA-PEG polymer loading with LiClO4/PC, a flexible, transparent free-standing quasi-solid polymer electrolyte (QSPE) was prepared. The ionic conductivity of QSPE membrane was carefully studied through electrochemical impedance spectroscopy. It was found that the QSPE membrane with 30 wt% 0.1 M LiClO4/PC displays a high conductivity (5.23 x 10(-6) S/cm at room temperature), good transparency (over 70% in visible ranges) and a certain of mechanical strength. Furthermore, a novel fiber-network structured membrane of polyvinyl butyral (PVB) was designed and prepared via electro-spinning, which would allow the liquid QSPE fully complex with PVB polymer structurally. A great improvement for interfacial adhesion between the gel electrolyte and electrodes was achieved, the tensile strength increased to 0.31 MPa (QSPE-PVB) from 0.05 MPa (QSPE), while remaining a good transparency. Meanwhile, the ionic conductivity of the composite electrolyte reached a level of 10(-5) S/cm.