Intercalation of Alkali Metal−Polyethylene Oxide Polymer Electrolytes in Layered CdPS3

摘要: Polyethylene oxide (PEO) has been inserted into the interlamellar space of CdPS3 pre-intercalated with hydrated alkali cations (Li, Na, K, and Cs). The intercalated compounds have characterized by X-ray diffraction, vibrational spectroscopy, conductivity measurements. These materials are interesting since corresponding metal PEO salts well known solid polymer electrolytes (SPEs). lattice expansion on intercalation, Delta d similar to 8 Angstrom, ether oxygens ratio electrolyte show only minor change for different same irrespective molecular weight PEG. polypropylene (PPO) showed a expansion. projected one-dimensional electron density calculated from diffraction shows that in displaced +/-1.7 Angstrom center gap. mid-IR spectra features arising (-O-CH2-CH2-O-) moiety both traits gauche conformations. A helical conformation maybe ruled out. data suggests adopts planar zig-zag structure at least two strands complexing cation. ambient temperature is comparable SPEs. Conductivity measurements provide evidence mechanism temperature. Below 200 K conductivities, cation, small. Above rises rapidly For Cs compounds, conductivities an Arrhenius dependence, but Li Na variation follows Vogel-Tamann-Fulcher relation characteristic ionic motion coupled segmental relaxation modes. parameters compared those electrolytes.