Abstract
A novel solid-state composite polymer electrolyte (CPE), based on a polymer, poly(ethylene oxide) (PEO), alkali metal salts, and NaY molecular sieve powders with a small amount of low molecular weight plasticizer, ethylene carbonate (EC) is investigated. (PEO)16LiClO4 polymer metal salt complexes with 5 wt% EC, and different content of NaY are prepared by the solution casting technology. The crystallization characteristic, surface morphology, and ionic conductivity of the CPE systems are studied using X-ray diffractometer (XRD) analysis, scanning electron microscopy (SEM), energy dispersive spectrometer, and impedance spectroscopy. It is found that NaY incorporation has a beneficial effect on the enhancement of ionic conductivity, increasing two orders of magnitude. XRD spectra show that the NaY has a major influence on the crystallization process of polymer matrix. By incorporating NaY, the crystallinity degree of PEO matrix obviously decreases. SEM images show a dramatic modification of surface morphology, the surface spherulites of polymer matrix disappear, and ultra-branched and cross-linked framework structure forms, which play an important role in ion transport and enhancing the tensile strength (TS). The TS is achieved 2.12 MPa with the content of 35 wt% NaY, far higher than the 0.17 MPa with (PEO)16LiClO4–5 wt% EC. In addition, it is demonstrated for the first time that EC affects the network structure of the molecular sieve and leads to exhibit enhanced ionic conductivity of electrolyte maintaining for a long time.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call