engleski

Poly(ethylene oxide)–lithium bis(oxalato)borate- based nanocomposite polymer electrolytes

This work is focused on the characterization of series of solid nanocomposite polymer electrolytes consisting of poly(ethylene oxide) (PEO), aminopropyl hepta isobutyl polyhedral oligomeric silsesquioxane (POSS) and lithium bis(oxalato)borate (LiBOB). Nanocomposites were prepared by melt intercalation method with different ether oxygen to lithium ions molar ratios (EO/Li) and different POSS loadings. Differential scanning calorimetry (DSC) shows that an addition of LiBOB and POSS causes an important decrease of the crystallinity and melting temperatures of PEO, while the glass transition temperatures shift to higher values. The influence of LiBOB and POSS on the PEO crystallinity was also confirmed by Fourier transform infrared spectroscopy (FTIR). Thermal stability as one of the key issues of the polymer electrolytes was investigated by the non-isothermal thermogravimetry. Thermogravimetric analysis (TGA) showed a more complex degradation of the prepared samples compared to pure PEO. However, polymer electrolytes remain thermally stable enough for their suitable applications in the electrochemical devices. Electrochemical impedance spectroscopy (EIS) reveals that LiBOB and POSS incorporation have positive influence on the ionic conductivity of PEO at room temperature. Considering the ionic conductivity of nanocomposites the optimized system was determined.

Poly(ethylene oxide), POSS, Thermal analysis, Ionic conductivity

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