Predominantly chain segmental relaxation dependent ionic conductivity of multiphase semicrystalline PVDF/PEO/LiClO4 solid polymer electrolytes

Sengwa, R. J.; Dhatarwal, Priyanka

doi:10.1016/j.electacta.2020.135890

Cited by 71 publications

(48 citation statements)

References 111 publications

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“…This finding confirms that the dispersion of TiO 2 nanoparticles in the primary composition of these electrolytes is not effective in regards to enhancing the ion transport mechanism. Further, the n values of these NSPE materials are found in the range 0.50 to 0.73, which are much lower than unity confirming that the ion transportation takes place predominantly through hopping mechanism and this fact agrees with the results on several other SPE materials investigated with dielectric spectroscopy [20,21,29,[31][32][33]70].…”

Section: Xrd Spectra and Crystal Structuressupporting

confidence: 86%

“…These results verify that there is a moderate alteration in the overall amount of ion-dipole ordering in the presence of TiO 2 nanoparticles up to 10 wt% but a large disordering is exhibited for the higher concentration of the nanofiller. The magnitude and dispersion trend of frequency dependent ε′ and ε″ values for these films evidence the existence of four types of dielectric polarization processes in the frequency range from 20 Hz-1 MHz which are demonstrated for some other electrolyte materials in recent publications [69,70]. The dominance of the electrode polarization (EP) process is exhibited at lower frequencies as evident from the high dielectric permittivity values of about three orders of magnitude for these NSPE films.…”

Section: Xrd Spectra and Crystal Structuressupporting

confidence: 54%

“…The shapes of these impedance plots are found in good resemblance with that of the several similar types of electrolyte [14,26,30,32,35,43,69]. Further, the shape of the Nyquist plot of NSPE20 film indicates that the arc and spike parts in the plot are not clearly separable as usually noted for the other electrolytes which reflect that there may be few stiffer domains on the film surfaces resulting in poor electrode/electrolyte contact [70]. The bulk resistance R b which is the dc resistance of the electrolyte material was noted from the real axis Z′ for each film at which the arc and spike intersect as marked by vertical dashed lines in the figure.…”

Section: Complex Impedance Plotsmentioning

confidence: 69%

“…These measurements were carried out at 1-V electric signal of frequency range 20 Hz-1 MHz, at 27 °C. The measured values of frequency dependent electrical quantities (i.e., capacitance C p , resistance R p , and dissipation factor D (tanδ)) were used for the determination of complex dielectric permittivity, electrical conductivity, impedance, and electric modulus spectra of the NSPE films from the respective relations described elsewhere [70]. The electrochemical analyzer (CH Instruments, Inc. CHI 608E) was employed for carrying out the linear sweep voltammetry (LSV), cyclic voltammetry (CV), and chronoamperometry (CA) of the NSPE films.…”

Section: Measurementsmentioning

confidence: 99%

“…Recently, we investigated detailed structural and dielectric properties of the PEO/PVDF blends over the entire blend composition range [42], these polymers blends based nanocomposites [68], and also a variety of SPE materials [35,69,70]. In continuation of these researches on the PEO/PVDF blend matrix-based various types of flexible dielectric and electrolyte materials, the present manuscript deals with the NSPE materials comprising (75PEO/25PVDF)/25 wt% LiClO 4 -x wt% TiO 2 compositions.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dhatarwal

Sengwa

2020

SN Appl. Sci.

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The effect of TiO 2 nanofiller concentration on the dielectric polarization and relaxation processes of (75PEO/25PVDF)/25 wt% LiClO 4-x wt% TiO 2 (x = 0, 2, 5, 10, 15, and 20) compositions based nanocomposite solid polymer electrolyte (NSPE) films has been investigated by employing the dielectric relaxation spectroscopy. The SEM micrographs demonstrate that the dispersion of TiO 2 nanoparticles enormously alters the spherulitic morphology with the development of some cracks, pores, and wrinkles of these solution-cast prepared NSPE films. The X-ray diffraction study confirms that the heterostructures of these NSPE materials are semicrystalline and their degree of crystallinity increases irregularly with the increase of TiO 2 concentration, however the crystallinity of host polymer blend matrix of these electrolytes decreases. The complex dielectric permittivity spectra of these NSPE materials in the frequency range from 20 Hz to 1 MHz at 27 °C reveal that there is a dominant contribution of electrode polarization and interfacial polarization at lower frequencies, whereas the high frequency permittivity values attribute to dipolar and ionic polarizations. Four types of relaxation processes have been probed by the 'master curve representation' of the dielectric and electrical spectra of these solid ion-dipole complexes. It is observed that the addition of TiO 2 nanoparticles up to 10 wt% in these electrolytes influences the dielectric properties anomalously, but a huge decrease in the dielectric polarization and increase in the relaxation times are noted resulting in a significant decrease in the ionic conductivity of the film at 20 wt% TiO 2 concentration. The dependence of dc ionic conductivity of these lithium-ion conducting NSPE materials on the chain segmental relaxation time and also the degree of crystallinity has been explored. The results of these NSPE materials have also been compared with the TiO 2 nanoparticles loaded different polymer matrices and salts based electrolytes and discussed appropriately. These lithium-ion based electrolyte films are accredited for the solid-state ion-conducting energy storing devices from their electrochemical parameters characterized by LSV, CV, and CA techniques.

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Section: Xrd Spectra and Crystal Structuressupporting

confidence: 86%

Section: Xrd Spectra and Crystal Structuressupporting

confidence: 54%

Section: Complex Impedance Plotsmentioning

confidence: 69%

Section: Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dhatarwal

Sengwa

2020

SN Appl. Sci.

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Ion–Dipole Interaction Regulation Enables High‐Performance Single‐Ion Polymer Conductors for Solid‐State Batteries

et al. 2022

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Solid polymer electrolytes with large ionic conductivity, high ionic transference number, and good interfacial compatibility with electrodes are highly desired for solid‐state batteries. However, unwanted polarizations and side reactions occurring in traditional dual‐ion polymer conductors hinder their practical applications. Here, single‐ion polymer conductors (SIPCs) with exceptional selectivity for Li‐ion conduction (Li‐ion transference number up to 0.93), high room‐temperature ionic conductivity of about 10−4 S cm−1, and a wide electrochemical stability window (>4.5 V, vs Li/Li+) are prepared by precisely regulating the ion–dipole interactions between Li+ and carbonyl/cyano groups. The resulting SIPCs show an excellent electrochemical stability with Li metal during long‐term cycling at room temperature and 60 °C. LiFePO4‐based solid‐state cells containing the SIPCs exhibit good rate and cycling performance in a wide temperature range from −20 to 90 °C. By the same way of ion–dipole interaction regulation, sodium‐ and potassium‐based SIPCs with both high ionic conductivity and high cationic transference numbers are also prepared. The findings in this work provide guidance for the development of high‐performance SIPCs and other metal‐ion systems beyond Li+.

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The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications

Suen

Elumalai

Debnath

et al. 2022

Adv Materials Inter

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Ionogels have established themselves as an intriguing type of composites, owing to their distinctive properties, including superior thermal stability, non‐flammability, tunable electrochemical stability window, and high ionic conductivity. Hybrid materials based on ionic liquids (ionogels) are held together by interfaces arising out of intermolecular interactions, including electrostatic, van der Waals, solvophobic, steric, and hydrogen bonding. The interfaces within the ionic liquid (ILs) and its multifaceted interplay with the encapsulating matrix greatly influence the physicochemical and electronic/ionic interactions within the composite resulting in exceptional characteristics, allowing for the design of ionogels for targeted applications. Though ionogels have shown superior properties comparable to neat ILs, they still exhibit relatively low mechanical strength, limiting their application in several practical technologies. Simultaneous enhancement of mechanical durability while retaining high ionic conductivity is indispensable, which requires understanding interfaces and related influencing parameters. This review provides a synergetic comprehension, focusing on the interactive forces and factors affecting the conductivity, stability, and robustness of ionogels. Correlating with interfaces, several strategies, including the implications of nanofiller incorporation on the electromechanical properties of ionogel, are also elaborated. Finally, a primer is provided on the application of ionogels in sensors and energy harvesting technologies.

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Predominantly chain segmental relaxation dependent ionic conductivity of multiphase semicrystalline PVDF/PEO/LiClO4 solid polymer electrolytes

Cited by 71 publications

References 111 publications

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Ion–Dipole Interaction Regulation Enables High‐Performance Single‐Ion Polymer Conductors for Solid‐State Batteries

The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications

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