engleski

Thermal investigation and kinetics of poly(ethylene oxide) and its composites

Solid polymer electrolytes (SPEs) are promising candidates for replacing liquid electrolytes in lithium ion batteries because of their excellent properties such as enhanced safety, flexibility and manufacturability, but ionic conductivity of SPEs has to be improved. Practically, poly(ethylene oxide) (PEO) is the only favourable candidate as SPE because of its ability to dissolve large amounts of inorganic (lithium) salt and its structure which supports lithium ion transport. However, high crystallinity of PEO limits ionic conductivity of these electrolytes. Nanocomposite technology offers possible solution to this problem since the incorporation of inorganic nanophases such as nanoclays in the PEO matrix is one of the promising ways to reduce the crystallinity of PEO. This investigation is focused on the preparation and characterization of PEO nanocomposites with montmorillonites as nanophase. PEO nanocomposites are prepared by a melt intercalation method and characterized by Small/Wide angle X-ray scattering (SAXS/WAXS), Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), Thermogravimetry (TGA) and Electrochemical impedance spectroscopy (EIS). Kinetic analysis of the non-isothermal thermogravimetric decomposition is performed. Influence of montmorillonites as nanophase on the structure, crystallinity, conformation, thermal properties and kinetics of the thermal decomposition of PEO is explained.

poly(ethylene oxide) ; solid polymer electrolytes ; nanocomposites ; crystallinity ; ionic conductivity

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