Highly conducting solid electrolytes based on poly (ethylene oxide‐co‐propylene oxide)

Abstract

The conducting properties of solid electrolytes comprising random poly(ethylene oxide‐co‐propylene oxide) (of 84 : 16 monomer units mole ratio) and lithium, sodium, potassium, cesium, and rubidium salts have been studied. The systems containing some lithium or sodium salts achieved conductivity levels as high as 10−5–10−4 S/cm at ambient temperature and greater than 10−3 S/cm at 100°C. However, the systems with rubidium and cesium salts exhibit conductivities a few orders of magnitude smaller. DSC studies show that the electrolytes studied are characterized by a high content of an amorphous phase (95–100%). It is suggested that the copolymer exhibits lower complexing abilities than that of poly(ethylene oxide), which results in a higher flexibility of electrolytes containing small cations and poor dissociation of the salts having large cations. © 1995 John Wiley & Sons, Inc.

Solid polymer electrolytes which contain tricoordinate boron for enhanced conductivity and transference numbers

“…4,5 Various methods have been used to suppress crystallinity and thereby increase conductivity as a result of higher polymer chain mobility and the resultant faster cation diffusion. Crystallization has been suppressed in PEO block copolymers, 6,7 through crosslinks, 8,9 in polymer gras, 10,11 polymer blends, [12][13][14][15][16][17][18] and due to the introduction of inorganic llers. 4,19 In addition to suppression of crystallization, llers can have other effects on electrochemical performance.…”

“…We demonstrate that both the concentration of boron moieties and the manner in which TEB is added inuence the electrochemical behavior of SPEs. The structures and properties of SPEs synthesized were characterized with scanning transmission electron microscopy (STEM), 29 Si, 11 B and 13 C solid state NMR, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and AC impedance spectroscopy. STEM allowed characterization of the composite SPEs for the rst time in their native condition (without removal of organic component) and estimation of OIC NP sizes.…”

Sequence determination of vinyl acetate–methyl acrylate copolymers by NMR spectroscopy

“…'s2 The microstructure of vinyl acetate /methyl acrylate ( V /M ) has not been reported in detail. Florjanczyk et al 3 investigated the comonomer sequence in V /M copolymers prepared using ethylaluminum chloride catalysts. They assigned the M-centered triads but did not determine the triad sequences quantitatively.…”

Cation environment in polyether complexes based on poly(tetramethylene glycol) doped with zinc and cobalt chlorides

“…6(b) and 7(b)]. Despite the dilution of the systems, the introduction of the salts in the polymer matrices leads to an increase in T g with increasing salt concentration (Table III), as discussed in the literature 10, 27, 28. This indicates a stiffening of the chain due to the ion–dipole interaction between the cation and the oxygen atoms of the polyether.…”