Abstract
The studies of phase behavior, dielectric relaxation, and other properties of poly(ethylene oxide) (PEO)/poly(methyl acrylate) (PMA) blends with the addition of lithium perchlorate (LiClO4) were done for different blend compositions. Samples were prepared by a solution casting technique. The binary PEO/PMA blends exhibit a single and compositional-dependent glass transition temperature (Tg), which is also true for ternary mixtures of PEO/PMA/LiClO4 when PEO was in excess with low content of salt. These may indicate miscibility of the constituents for the molten systems and amorphous domains of the systems at room temperature from the macroscopic point of view. Subsequently, the morphology of PEO/PMA blends with or without salt are correlated to the phase behavior of the systems. Phase morphology and molecular interaction of polymer chains by salt ions of the systems may rule the dielectric or electric relaxation at room temperature, which was estimated using electrochemical impedance spectroscopy (EIS). The frequency-dependent impedance spectra are of interest for the elucidation of polarization and relaxation of the charged entities for the systems. Relaxation can be noted only when a sufficient amount of salt is added into the systems.
Highlights
Lithium (Li)-ion batteries that exhibit appreciably high energy and power density are the choice of the electrochemical energy storage for portable electronics/devices, hybrid/full electric vehicles, etc. [1,2,3]
One of the strategies to enhance the ionic conductivity of binary mixtures of poly(ethylene oxide) (PEO) and Li salt is to add a second polymer that is miscible or homogenous with PEO, for example poly(methyl acrylate) [9,13], poly(methyl methacrylate) [14], polyacrylate (PAc) [15], poly(propylene oxide) (PPO) [16], poly(ε-caprolactone) (PCL) [17,18], etc., with the aim to suppress the crystallinity of PEO
The blend is seen as a single-phase polymer blend when when it it exhibits blend) exhibits aa single single and and composition-dependent composition-dependent TTgg
Summary
Lithium (Li)-ion batteries that exhibit appreciably high energy and power density are the choice of the electrochemical energy storage for portable electronics/devices, hybrid/full electric vehicles, etc. [1,2,3]. The amorphous phase of the ternary systems can be homogenous or heterogeneous (c.f. text below) depending on the composition of the blends as well as the salt content, which in the end may lead to enhancement or reduction on conductivity as compared to the binary PEO–salt system at a constant mass fraction of salt (W S ) or at constant mass fraction of PEO (W PEO ). It is noteworthy that these polymer electrolyte systems are becoming more complex and complicated in the ternary mixture at 25 ◦ C As a result, these composition-dependent ternary systems of PEO/PMA/LiClO4 will have different morphologies, which lead to different conductivities at constant salt content or constant blend composition. Li–salt relaxation of dipoles in composition-dependent PEO/PMA blends after addition of Li–salt was electrochemical impedance spectroscopy (EIS), respectively. PEO/PMA blends after addition of Li–salt was studied by EIS and will be discussed
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