Abstract
Polymeric membranes of poly(ethylene oxide) (PEO) and sodium trifluoroacetate (PEO:CF3COONa) combined with different concentrations of aluminum oxide (Al2O3) particles were analyzed by impedance spectroscopy, differential scanning calorimetry (DSC) and thermogravimetry (TGA). DSC results show changes in the crystalline fraction of PEO when the concentration of Al2O3 is increased. TGA analysis showed thermal stability up to 430 K showing small changes with the addition of alumina particles. The decrease in crystalline fraction for membranes with low Al2O3 concentration is associated with the increase in conductivity of (PEO)10CF3COONa + x wt.% Al2O3 composites.
Highlights
Solid polymer electrolytes (SPEs) are materials that have been widely investigated for their potential use in a variety of electrochemical devices such as fuel cells, batteries, electrochromic windows, supercapacitors, among others [1]
We conducted a thermal analysis of (PEO)10 CF3 COONa + x wt.% Al2 O3 systems, through the differential scanning calorimetry (DSC) and thermogravimetry (TGA), to determine present phases and thermal stability and to correlate these results with those of conductivity obtained by impedance spectroscopy
There, two anomalies can be observed: One endothermic about 330 K, which corresponds to the poly(ethylene oxide) (PEO) crystalline phase melting, and one exothermic about 443 K corresponding to the polymer decomposition
Summary
Solid polymer electrolytes (SPEs) are materials that have been widely investigated for their potential use in a variety of electrochemical devices such as fuel cells, batteries, electrochromic windows, supercapacitors, among others [1]. To be used in these devices, SPEs must show high ionic conductivity, good electrochemical stability, and a wide thermal stability range [2] Improvements in these physicochemical and structural characteristics have been reported when SPEs are added with a variety of fillers [3]. K and Li+ , show a reduction of the crystalline phase and an increase in dissolved ions mobility These changes lead to systems with relatively high ionic conductivity values (σ ~ 1 × 10−5 S cm−1 ) [4,5]. The improvement in thermal, electrical and mechanical properties of electrolytes based on PEO added with ceramic particles, can be explained by the decline of the kinetics of polymer crystallization, which increases the amorphous phase in localized regions and contributes to the formation of highly conductive pathways [12,13]. We conducted a thermal analysis of (PEO) CF3 COONa + x wt.% Al2 O3 systems, through the differential scanning calorimetry (DSC) and thermogravimetry (TGA), to determine present phases and thermal stability and to correlate these results with those of conductivity obtained by impedance spectroscopy
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