Impedance spectroscopy, ionic conductivity and dielectric studies of new Li+ ion conducting polymer blend electrolytes based on biodegradable polymers for solid state battery applications
Abstract:New solid polymer blend electrolyte films based on biodegradable polymer blend comprising of polyvinyl alcohol (PVA) and poly (N-vinyl pyrrolidone) (PVP) doped with different wt% of lithium carbonate (Li 2 CO 3 ) salt have been prepared by solution casting method. The resulting PVA/PVP/Li 2 CO 3 polymer blend electrolyte films have been characterized by various analytical techniques such as FTIR, UV-vis, XRD, TGA, polarized optical microscopy and scanning electron microscopy. The FTIR and XRD analysis confirme… Show more
“…The plot shows part of semicircle or broad ended arc in the defined range whose centre was found to be depressed somewhat below the real axis that shows the relaxation behaviour of the dielectric is not perfectly Debye and there is distribution of relaxation time as well as polarization mechanism. Similar plots have been observed for PVA/PVP blend by Deshmukh et al 2 and for PEDOT:PSS/PVA blend by Chen et al 1 The complex dielectric constant is given by Figure 6. Nyquist plot of dielectric constant for (a) pure PVA and (b) 20 wt% PEG-PVA blend film. PVA: polyvinyl alcohol; PEG: poly(ethylene glycol).…”
Section: Resultssupporting
confidence: 80%
“…A large number of polymers such as polyvinylpyrrolidone (PVP), polymethyl methacrylate (PMMA) and polyvinyl alcohol (PVA) and polymer blends such as poly-ethylenedioxythiophene: poly-styrenesulfonate-polyvinyl alcohol (PEDOT: (PSS)-PVA), PVP-PVA, polypyrrole-poly(ethylene glycol) (PPy-PEG) and polymer electrolytes have been tested as dielectric layers by researchers. 1 –5 Blending implies mixing of two or more polymers physically and allows the creation of new material with specific properties depending upon the composition. 3 Blending is known to be one of the most effective methods to improve the conductivity and often results in better properties than the individual polymers.…”
In this work, polymer blend films based on polyvinyl alcohol (PVA)/poly(ethylene glycol) (PEG) were prepared by solution casting technique. X-ray diffraction (XRD) analysis was performed to investigate the structural details of the polymer blend. XRD pattern confirms the polycrystalline nature of the films. Sandwich structures of the type Ag-PVA/PEG-Ag were formed to study the dielectric and conduction properties in the frequency range 300 Hz–3 MHz and at different temperatures varying from 298 K to 420 K. Experimental results show that both dielectric constant ( ε′) and dielectric loss ( ε″) values were strong functions of frequency and temperature. The AC conductivity ( σAC) was found to obey the power law Aωs and correlated barrier hopping as the conduction mechanism. The imaginary part of electric modulus shows peak shifting corresponding to relaxation mechanisms. Electric modulus study was also found to support the dielectric permittivity data.
“…The plot shows part of semicircle or broad ended arc in the defined range whose centre was found to be depressed somewhat below the real axis that shows the relaxation behaviour of the dielectric is not perfectly Debye and there is distribution of relaxation time as well as polarization mechanism. Similar plots have been observed for PVA/PVP blend by Deshmukh et al 2 and for PEDOT:PSS/PVA blend by Chen et al 1 The complex dielectric constant is given by Figure 6. Nyquist plot of dielectric constant for (a) pure PVA and (b) 20 wt% PEG-PVA blend film. PVA: polyvinyl alcohol; PEG: poly(ethylene glycol).…”
Section: Resultssupporting
confidence: 80%
“…A large number of polymers such as polyvinylpyrrolidone (PVP), polymethyl methacrylate (PMMA) and polyvinyl alcohol (PVA) and polymer blends such as poly-ethylenedioxythiophene: poly-styrenesulfonate-polyvinyl alcohol (PEDOT: (PSS)-PVA), PVP-PVA, polypyrrole-poly(ethylene glycol) (PPy-PEG) and polymer electrolytes have been tested as dielectric layers by researchers. 1 –5 Blending implies mixing of two or more polymers physically and allows the creation of new material with specific properties depending upon the composition. 3 Blending is known to be one of the most effective methods to improve the conductivity and often results in better properties than the individual polymers.…”
In this work, polymer blend films based on polyvinyl alcohol (PVA)/poly(ethylene glycol) (PEG) were prepared by solution casting technique. X-ray diffraction (XRD) analysis was performed to investigate the structural details of the polymer blend. XRD pattern confirms the polycrystalline nature of the films. Sandwich structures of the type Ag-PVA/PEG-Ag were formed to study the dielectric and conduction properties in the frequency range 300 Hz–3 MHz and at different temperatures varying from 298 K to 420 K. Experimental results show that both dielectric constant ( ε′) and dielectric loss ( ε″) values were strong functions of frequency and temperature. The AC conductivity ( σAC) was found to obey the power law Aωs and correlated barrier hopping as the conduction mechanism. The imaginary part of electric modulus shows peak shifting corresponding to relaxation mechanisms. Electric modulus study was also found to support the dielectric permittivity data.
“…In the second stage, the temperature range was captured to be 100-240 °C which may be a result of the decomposition of the main chain of polymers [57]. In the third stage, the region 240-350 °C was noticed which might be due to the Ag NPs decomposition [58], the region after 350 °C up to 500 °C due to the carbonization and degradation of the polymeric matrix. Less loss of weight was noticed in the PAM/PVA/Ag polymer nanocomposites films compared to pure blend, this indicates that the thermal stability of polymer blend was improved due to the interaction between the components (blend and Ag NPs) that leading to mutual stabilization and enhancement of the thermal stability of the nanocomposite films.…”
In the present study, the chemical preparation of silver nanoparticles (Ag NPs) solution was achieved by decreasing silver salt via the use of sodium borohydride (NaBH 4). The particles appeared to have a crystalline nature through the XRD study, with a face-centered cubic (FCC) structure. The formation of silver nanoparticles (Ag NPs) was asserted by the UV, XRD and TEM. An absorption peak at around 430 nm was demonstrated through UV-visible spectrum of the aqueous medium which related to of Ag NPs. The solution casting method was used to prepare new nanocomposites films on the bases of polymer blend which related to of PAM-and PVA-doped with different wt% of Ag NPs. Various analytical techniques were used to characterize the prepared films. It was confirmed through the XRD analysis that there existed a complex formation between polymer blend and Ag NPs. A reduction in the value of the optical bandgap was displayed by UV-Vis with an increase in the concentration of Ag NPs. It was shown through the FTIR spectrum that there existed changes in the FTIR spectrum with dopant concentration indicating the interaction of dopant with the polymer blend. A great improvement in the thermal stability of the composites was proved through the TGA study with the loading of Ag NPs. The ionic conductivity at room temperature was improved by the doping of Ag NPs ions into the polymer blend system. This is attributed to the increase in mobile charge carriers and their mobility. The dielectric values in the studied frequency range indicate a strong dielectric dispersion which increases as the content of the Ag NPs increases. Consequently, these films can be suggested as a suitable application in optical devices and dielectric applications due to the observed improvement in optical properties and ac conductivity.
“…For example, the ability to perform high-throughput screening of ion conductivity has the potential to accelerate design of new ion-conducting media for next-generation energy storage applications. 61 ■ ASSOCIATED CONTENT…”
Section: ■ Discussion and Conclusionmentioning
confidence: 99%
“…Beyond these properties, BDS also provides access to a range of other properties of technological interest. For example, the ability to perform high-throughput screening of ion conductivity has the potential to accelerate design of new ion-conducting media for next-generation energy storage applications …”
Broad-band dielectric spectroscopy (BDS) provides a powerful method of characterizing relaxation dynamics in diverse materials. Here we describe and employ a novel instrument for high-throughput broad-band dielectric spectroscopy (HTBDS) that accelerates this capability, enabling simultaneous measurements of 48 samples. This capability is based around a coaxial switching system for rapid scanning between multiple samples on the same sample stage, coordinated with shared environmental control. We validate the instrument by measuring dielectric response in three polymers, distributed across 48 sample sites, and comparing results to measurements via a standard BDS instrument. Results are found to be reproducible and are in agreement with relaxation times from traditional BDS. We then employ HTBDS to establish mixing rules for glass transition temperatures, kinetic fragility indices, and segmental stretching exponents in a series of acrylate copolymers, a matter of considerable technological interest in a variety of technological applications. Results are consistent with the empirical Fox rule for the glass transition temperature T g averaging in polymer blends, while they reveal a linear mixing rule for kinetic fragility indices. Finally, we test several proposed correlations between these distinct dynamical properties. These results demonstrate that HTBDS enables measurements of polymer relaxation at a throughput approximately 10 times higher than that of standard BDS approaches, opening the door to high-throughput materials design of dynamic response across a broad range of frequencies.
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