Abstract
Abstract Solid polymer electrolytes (SPEs) were prepared by solution casting and followed by hot pressing process. The halloysite nanotubes (HNTs) were added to polyethylene oxide (PEO)- trifluoromethanesulfonate (LiCF3SO3) composites and its effects on ionic conductivity, morphology and crystallinity of SPEs were investigated. The ionic conductivity was determined by impedance spectroscopy, the ionic conductivity of SPEs was found to increase with the increasing of HNTs. The results revealed that 15 wt% of HNTs provided the highest ionic conductivity of 3.46 x 10-5 S.cm-1 at room temperature (RT.), which higher than that of the PEO–LiCF3SO3 electrolyte (1.74 x 10-5 S.cm-1). At above 15 wt% of HNTs, the ionic conductivity decreased because of the HNTs aggregation as shown on the SEM image. The crystallinity of SPEs was characterized by X-ray diffractometer (XRD). The glass transition and melting temperatures and the degree of crystallinity were investigated by differential scanning calorimetry (DSC).The interaction between PEO-LiCF3SO3 and HNTs was observed by Fourier transform infrared spectrometer (FT-IR).
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