Impact of shape (nanofiller vs. nanorod) of TiO₂ nanoparticle on free‐standing solid polymeric separator for energy storage/conversion devices

Abstract

We report the investigation on examining the impact of nanofiller (NF)‐ versus nanorod (NR)‐shaped titanium oxide (TiO2) nanoparticle on the structural, electrochemical, transport, thermal, and dielectric properties of the solid polymer electrolyte (SPE). Thin SPE films comprising of poly(ethylene oxide), sodium hexafluorophosphate, and dispersed with TiO2 NF, TiO2 NR (synthesized by hydrothermal route) has been prepared via solution cast technique. The shape of nanoparticle influences the morphological and structural properties as observed in field emission scanning electron microscope and X‐ray diffraction analysis. The highest ionic conductivity was exhibited by the NR dispersed system and is higher than NF dispersed system for all recorded concentration consistently. It is attributed to the formation of the long‐range conductive path with NR when compared with NF. In addition, the electrochemical stability window is much higher (~5 V) than the NF‐doped system. Furthermore, the dielectric properties of SPE were investigated and fitted in the complete frequency window (1 Hz–1 MHz; T = 40–100 °C @ 10 °C). It is observed that the NR dispersed system shows higher dielectric strength and low relaxation time with respect to NF dispersed system. The results suggest that the NR dispersed SPE possess enhanced properties and is more appropriate for an application in high energy density solid‐state Na ion batteries. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47361.

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

“…A survey of literature confirms that for the lithium-ion conducting SPE materials, the LiClO 4 is one of the appealing ionic dopants used enormously for the preparation of SPEs [10,23,27,33,36]. The investigations on numerous NSPE materials have claimed that the dispersion of TiO 2 nanoparticles mostly increases the ionic conductivity, and some studies also reported an unexpected increase by a few orders of magnitude [22,23,30,[49][50][51][52][53][54][55][56][57][58][59][60][61][62]. Some studies have concluded that only the acidic groups surface-modified TiO 2 and some other inorganic nanofillers are effective in increasing the conductivity of the NSPE materials [63,64].…”

Comparison effect of thin microrod‐nanowhisker manganese oxide (MnO2) and spherical grain‐like cobalt oxide (Co3O4) as nanofiller for performance‐enhanced composite gel terpolymer electrolyte‐based dye‐sensitized solar cells

“…The crystallite size also known as coherent length is tabulated in Table 2 and we can observe that the values of τ are decreased upon inclusion the nanofillers in both systems. This indicates that the degree of crystallinity of two broad humps has decreased, implying an amorphous phase in the CGPE systems that provide more free volume for the transportation of ions via interaction of nanofiller‐polymer and ion‐polymer 39–41 . In addition, the crystallinity index of the CGPE can be calculated from the ratio of the integrated area of all crystalline peaks to the total integrated area under the XRD peaks using Equation () as follows: where, I a and I c are the integrated intensities corresponding to the amorphous and crystalline phases obtained from the area under the curve of XRD graph using OriginPro, respectively.…”

Recent Advances and Perspectives on the Polymer Electrolytes for Sodium/Potassium‐Ion Batteries

“…Further, Arya et al. [ 111 ] comparatively studied the effect of different shapes of TiO 2 nanoparticles (nanofiller vs nanorod) on electrochemical properties of SPEs, and showed that the ionic conductivity was sensitive to the shape of nanoparticles, and the PE with the addition of TiO 2 nanorods presented superior properties (dielectric nature, electrochemical window, ionic conductivity) than that added with TiO 2 nanofillers.…”